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Synthesis and characterization of bismuth oxide/commercial activated carbon composite for battery anode

  • Yayuk Astuti EMAIL logo , Siti Hartinah , Adi Darmawan and Hendri Widiyandari
Published/Copyright: December 7, 2022
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Open Chemistry
From the journal Open Chemistry Volume 20 Issue 1

Abstract

Bismuth oxide has been considered as a promising electrode material due to the high theoretical capacity, low cost, and non-toxic nature. However, its application has been limited by the low electrical conductivity. In this work, bismuth oxide/commercial activated carbon composite were successfully synthesized through hydrothermal method. Bismuth nitrate pentahydrate with concentrations of 8, 24, and 32 mmol were mixed with Na2SO4, NaOH, and commercial activated carbon. The mixture was then put into a hydrothermal reactor and heated at 110°C for 5 h. These composite materials can have a 102–105 higher electrical conductivity, depending on the bismuth oxide ratio, compared to both bismuth oxide and commercial AC separately.

Keywords: bismuth oxide; activated carbon; hydrothermal; battery; anode

1 Introduction

The battery is an electrical energy storage technology that is able to convert chemical energy into electrical energy through electrochemical reactions of reduction and oxidation [1]. Battery performance involves the transfer of electrons from the negative electrode (anode) to the positive electrode (cathode) so as to produce an electric current and a potential difference [2]. The use of materials with high charge storage quality can materialize more durable discharge process and shorter or more efficient charging process, thereby reducing the consumption of electrical energy [3].

The battery consists of an electrode, electrolyte, and separator. The electrode is a battery component that contains active ingredients. The battery electrodes are divided into cathode and anode. The anode is a negative electrode associated with a half-cell oxidation reaction that releases electrons into the external circuit [4]. Materials that can be used as anodes must have good ion/charge conductivity, large energy capacity [5], long cycle life, easy to process, non-toxic, and low in price. One of the kind of materials that can be used as a battery anode is metal oxides because of its high theoretical capacity and low cost, such as bismuth oxide (Bi2O3), which has good electrical and optical properties [6], has a volumetric capacity value of 3,765 mA h cm−1, in the form of Bi2O3 has a potential difference of 2.8 V, is non-toxic, and relatively cheap [7]. However, the use of bismuth oxide as an anode has a drawback, namely the low conductivity value at 1.56 × 10−7 S m−1 [8], responsible for the slow ion/charge conductivity of the anode, inferring the need for additional materials to produce higher conductivity value, such as activated carbon.

Xia et al. [9] in their research on the synthesis of mesoporous carbon composites with Bi2O3 as an electrode material using a microwave, obtained excellent performance capacitance and specific capacity reaching 386 F g−1. Wang et al. [10] reported on the synthesis of activated carbon composites with bismuth oxide using the vacuum impregnation method as a supercapacitor. The result was that the activated carbon composite with bismuth oxide had a specific capacitance value of 332.6 F g−1 at 1 A g−1. In addition, a recent study by Astuti et al. [8] regarding the synthesis of Bi/rice husk AC composite by hydrothermal method with variations in the weight ratio of activated carbon and bismuth nitrate of 2:1, 1:1, and 1:2, produced electrical conductivities of 0.51 × 10−5, 1.24 × 10−5, and 0.59 × 10−5 S m−1, respectively. The electrical conductivity value obtained, based on the said results, did not significantly increase on the account that the composition between activated carbon and bismuth oxide that had been formed might not be precise, emphasizing that the ratio/composition of a composite is very important. Meanwhile, the synthesis of bismuth oxide using the hydrothermal method showed higher electrical conductivity of the product formed in comparison with pure bismuth oxide [11] and composites produced in Astuti et al. [8]. Recently, Astuti et al. [12] reported the production of bismuth oxide/activated carbon composite synthesized using hydrothermal method. The activated carbon was from rice husk. The investigation recommends on paying attention to the factors affecting the formation of composite particularly the composition factor of precursor.

Pertaining to the above, a Bi/AC composite was synthesized with various concentrations of bismuth nitrate pentahydrate (BNP) using the hydrothermal method to ensure that Bi2O3, as the main constituent of the composite, can be formed optimally and has a high electrical conductivity value. Moreover, the variation in the mole concentration of BNP used was designed to determine the effect of concentration on the formation of bismuth oxide and the characteristics of the composite material produced and would later be used as a battery anode. The combining of activated carbon with bismuth oxide into a composite was carried out to improve the electrical properties of bismuth oxide using the hydrothermal method with varying concentrations of BNP.

2 Research methodology

2.1 Materials

The materials used in this study were BNP (Sigma Aldrich), distilled water, sodium sulfate (Merck), sodium hydroxide (Merck), commercial activated carbon (Brataco). All chemicals were of analytical grade without further purification.

2.2 Research methodology

2.2.1 Synthesis of Bi/AC composites

Synthesis of Bi/AC composites were carried out using hydrothermal method with varying concentrations of BNP (Bi(NO3)3·5H2O) of 8, 24, and 32 mmol. 8 mmol of Bi(NO3)3·5H2O was added with 12 mmol Na2SO4, dissolved in 40 mL distilled water, then stirred using IKA RH Basic KT/C at 1,500 rpm for 45 min. The solution mixture was then added with 40 mL of 72 mmol of NaOH [13]. Later, 0.5 g of commercial coconut shell AC was added to the solution mixture. The solution mixture was then put into a hydrothermal reactor and heated at 110°C for 5 h. The resulting mixture solution was cooled and then filtered. The filtered precipitate was dried using an oven (Fisher Scientific) at a temperature of 110°C for 60 min. It was then sieved with a size of 100 mesh. The same treatment was applied to the synthesis of composites Bi(NO3)3·5H2O at 24 and 32 mmol.

2.2.2 Characterization of Bi/AC composites

The Bi/AC composites were characterized by Fourier Transform Infra-Red (FTIR) spectrometer Shimadzu IRAffinity-1 to determine the functional groups of the composite material. FTIR analysis was performed at wavenumbers 4,000–400 cm−1 with a frequency rate of 0.25 cm−1 at room temperature. The X-Ray Diffraction (XRD) Shimadzu 7000 analysis for the identification of crystalline structures was carried out by measuring at an angle of 2θ with Cu-Kα radiation (λ = 0.15406 nm). Composite conductivity values were determined using Electrochemical Impedance Spectrometry (EIS) (LCR meter HIOKI 3532-50). The samples were analyzed in the form of pellets with a diameter of 1.5 cm and a thickness of 2–5 mm. Scanning Electron Microscopy-Energy Dispersive X-Ray mapping, Jeol JED 6510LA, was used to determine surface morphology and composition of the composite material, while thermal gravimetric analysis–differential thermal analysis (TGA–DTG), Mettler Toledo TGA/DSC 3+, was used to measure changes in mass, thermal decomposition, and thermal stability of the composite material with measurements in the temperature range of 40–800°C. To determine the surface area, the adsorption–desorption isotherms, the pore size, and pore volume of the composite materials, the TriStar II 3020 Gas Sorption Analyzer (GSA) was used.

3 Results and discussion

3.1 Bi/AC composites

Bi/AC composites were produced by mixing Bi(NO3)3·5H2O, sodium sulfate (Na2SO4), sodium hydroxide (NaOH), and commercial AC. The mixing of Bi(NO3)3·5H2O and Na2SO4 formed a complex compound, Bi2O(OH)2SO4, as per equation (1), characterized by the presence of a white suspension. When the NaOH solution was added, the OH– ions from the NaOH solution would gradually react with the Bi2O(OH)2SO4 complex to form Bi(OH)3 as presented in equation (2). The Bi(OH)3 solution along with commercial AC were put into a hydrothermal reactor (autoclave) and then heated. During the heating process, Bi(OH)3 would hydrate and turn into Bi2O3 [13] as illustrated in equation (3). The overall reaction mechanism that occurred is as follows:

(1) 2 Bi ( NO 3 ) 3 ⋅ 5 H 2 O + Na 2 SO 4 → Bi 2 O ( OH ) 2 SO 4 + 2 NaNO 3 + 4 HNO 3 + 7 H 2 O,

(2) Bi 2 O ( OH ) 2 SO 4 + 2 NaOH + H 2 O → 2 Bi ( OH ) 3 + Na 2 SO 4 ,

(3) 2 Bi ( OH ) 3 → Bi 2 O 3 + 3 H 2 O .

The colors of the synthesized Bi/AC vary with the ratio of bismuth oxide in the composite as seen in Figure 1. The 8 mmol Bi/AC composite produced a darker color because the percentages of BNP and commercial AC were almost the same and the color of the activated carbon was still dominated. The 24 mmol Bi/AC composite has light gray in color because the percentage of added BNP was more than the commercial AC, and thus the color of the activated carbon was not too dominant. The 32 mmol Bi/AC composite demonstrated a gray composite with a lumpy texture (agglomerate), as shown in Figure 2, attributed to the percentage of added BNP, which was higher than the commercial AC at 32 mmol. The color generated by the composites originated from the joint color of bismuth oxide, which is pale yellow [14], and commercial AC, which is black. The yellow color of Bi2O3 caused saturation of the black color on the activated carbon so that the resulting composite had appeared blackish gray.

Figure 1 Bi/AC composites prepared with (a) 8 mmol, (b) 24 mmol, and (c) 32 mmol Bi(NO3)3·5H2O.
Figure 1

Bi/AC composites prepared with (a) 8 mmol, (b) 24 mmol, and (c) 32 mmol Bi(NO3)3·5H2O.

Figure 2 FTIR spectra of pure Bi2O3 [20,21], commercial AC [22] and composites.
Figure 2

FTIR spectra of pure Bi2O3 [20,21], commercial AC [22] and composites.

3.2 Material characteristics

3.2.1 Functional group structures

Figure 2 shows that the three composite samples had almost the same absorption peaks, namely the low absorption at wavenumber 826–833 cm−1, which identified the presence of the Bi–O–Bi group, and wavenumber 1,384–1,380 cm−1, which identified the stretching vibration of Bi–O [15]. The same peaks were also observed in the pure bismuth oxide sample, showcasing absorption at wavenumbers of about 840 cm−1, identifying the presence of the Bi–O–Bi group [16], and 1,384 cm−1, indicating the presence of the Bi–O group [17]. The results implied that Bi2O3 have been formed in the composite sample. Absorptions at around 1,600 cm−1 and 1,100 cm−1 were also observed in the three samples, indicating the presence of the C═C and C−O functional groups [18]. In the spectra of the commercial AC, these vibration modes were also observed at 1540.16 and 1040.90 cm−1. The spectra thus suggested that the composite had contained commercial AC. The absorption at wavenumber 3,440 cm−1 signified the vibrational stretching of the O–H group [19]. Complete FTIR test results on the functional groups of the 8, 24, and 32 mmol Bi/AC composites, pure Bi2O3, and commercial AC are shown in Table 1.

Table 1

Functional groups in the FTIR spectra

Functional group Wavenumber in the observed sample (cm−1)
8 mmol Bi/AC 24 mmol Bi/AC 32 mmol Bi/AC Commercial AC Bismuth oxide (Bi2O3)
Bi–O 1384.09 1383.77 1380.52 — 1384.67
Bi–O–Bi 826.25 833.75 826.25 — 839
C═C 1635.57 1640.70 1636.60 1540.16 —
C–O 1107.09 1116.28 1107.2 1040.90 —
O–H 3434.38 3448.04 343.72 — —

3.2.2 XRD characterization

Figure 3 shows the diffractograms of composites, bismuth oxide database, commercial activated carbon and BNP. The XRD characterization result of the 8 mmol Bi/AC showed the presence of Bi2O3 with α-Bi2O3 (monoclinic) crystal structure denoted by peaks at 2θ = 27.453°, 33,316°, 26,992°, 46,372°, 26,992°, 37,667°; β-Bi2O3 (tetragonal) crystal structure demonstrated by peaks at 2θ = 30.184°, 46.372°; and γ-Bi2O3 (cubic) crystal structures at peaks of 2θ = 27.453° and 30.184°. The presence of commercial AC was indicated by the low intensity peaks at 2θ = 23.923°, 26.992°, 35.463°, while the pure BNP presence was denoted by the peak at 2θ = 30.184°. The 24 mmol Bi/AC composite showed the presence of α-Bi2O3 (monoclinic) crystal structure with low intensity peaks at 2θ = 46.86° and 56,692°; β-Bi2O3 (tetragonal) at 2θ = 30.094°, 32.672°, 46.860°; and γ-Bi2O3 (cubic) at 2θ = 30.094° and 32.672°. The presence of commercial AC was shown at 2θ = 23.879° and 35.201°, while the pure BNP were shown by peaks at 2θ = 30.094°, 32.672°, 42.099°, 53.239°. In the 32 mmol Bi/AC composite, the presence of Bi2O3 was indicated by the crystal structures of α-Bi2O3 (monoclinic) at 2θ = 27.485°, 33.305° and γ-Bi2O3 (cubic) at 2θ = 27.485°, 39.152° at low intensities. The presence of the commercial AC was denoted by peaks at 2θ = 22.463°, 35.594°, and the pure BNP was signified by peaks at 2θ = 21.822°, 28.97°, 31.373°, 35.594°, 40.712°, 53.274°. The complete data regarding the 2θ peaks of the composite samples compared with the 2θ peaks of Bi2O3 (JCPDS), commercial AC, and pure BNP data are shown in Table 2.

Figure 3 Diffractograms of 8, 24, and 32 mmol Bi/AC composites along with Bi2O3 (JCPDS database under the numbers 41-1449 for α-Bi2O3, 27-0050 for β-Bi2O3, and 45-1344 for γ-Bi2O3), commercial AC, and pure BNP.
Figure 3

Diffractograms of 8, 24, and 32 mmol Bi/AC composites along with Bi2O3 (JCPDS database under the numbers 41-1449 for α-Bi2O3, 27-0050 for β-Bi2O3, and 45-1344 for γ-Bi2O3), commercial AC, and pure BNP.

Table 2

XRD 2θ data comparison of the composite samples with Bi2O3 (JCPDS), commercial AC, and pure BNP

Bi/Commercial AC Composite 2θ
α-Bi2O3 β-Bi2O3 γ-Bi2O3 Commercial AC Pure BNP
8 mmol 27.453° 30.184° 27.453° 23.923° 30.184°
33.316°
26.992°
46.372° 46.372° 30.184° 26.992° 35.463
26.992°
37.667°
24 mmol 46.860° 30.094° 30.094° 23.879° 30.094°
32.672°
56.692° 32.672° 32.672° 35.201° 42.099°
46.860° 53.239°
32 mmol 27.485° — 27.485° 22.463° 21.822°
28.974°
31.373°
33.305° 39.152° 35.594° 35.594°
40,712°
53,274°

3.2.3 Electrical conductivity

Table 3 shows that the conductivity value of pure Bi2O3 was smaller than the conductivity value of activated carbon, connoting that the addition of activated carbon could increase the conductivity value of bismuth oxide. The addition of activated carbon functioned as a matrix in the composite prompted the distribution of bismuth oxide to be more even on the surface of the activated carbon [23]. The addition of activated carbon to bismuth oxide to create a composite also showed a higher conductivity value in the product made.

Table 3

The conductivity values measured from the EIS test

Sample Conductivity (S m−1)
8 mmol Bi/AC 0.69 × 10−3
24 mmol Bi/AC 0.15 × 10−2
32 mmol Bi/AC 0.89 × 10−1
Pure Bi2O3 0.15 × 10−6 [11]
BNP 1.70 × 10−1 [12]
Commercial AC 0.74 × 10−5 [22]

The data shown in Table 3 demonstrate that the 32 mmol Bi/AC composite had the highest electrical conductivity value at 0.89 × 10−1 S m−1. This can be attributed to the fact that the 32 mmol composite had a higher percentage of BNP compared to the 8 mmol and 24 mmol composites. Measured through the EIS test, BNP was found to have a very high conductivity value, which was 1.70 × 10−1 S m−1. The 24 and 8 mmol Bi/AC composites had electrical conductivity values of 0.15 × 10−2 and 0.69 × 10−3 S m−1, respectively.

3.2.4 Distribution of elements containing in the composites

The SEM images of the 8, 24, and 32 mmol Bi/AC composites are shown in Figure 4, depicting long needle-like shape in the 8 mmol composite as the embodiment of the monoclinic Bi2O3 crystals [24]. Meanwhile, the 24 and 32 mmol Bi/AC composites were both irregular in shapes. The low content of Bi2O3 in the 24 and 32 mmol Bi/AC, as illustrated in the XRD data, brought the non-needle-like structure of the two composites.

Figure 4 SEM images of Bi/AC composites prepared with (a) 8 mmol, (b) 24 mmol, and (c) 32 mmol BNP.
Figure 4

SEM images of Bi/AC composites prepared with (a) 8 mmol, (b) 24 mmol, and (c) 32 mmol BNP.

SEM mappings of 8, 24, and 32 mmol composites are shown in Figure 5. The 8, 24, and 32 mmol Bi/AC composites all had evenly distributed Bi element on the composite surface.

Figure 5 SEM mappings of Bi/AC composites prepared with (a) 8 mmol, (b) 24 mmol, and (c) 32 mmol BNP.
Figure 5

SEM mappings of Bi/AC composites prepared with (a) 8 mmol, (b) 24 mmol, and (c) 32 mmol BNP.

3.2.5 Transition phase

The TGA–DTG curves of the Bi/AC composites are shown in Figure 6, presenting the changes in mass of the 8, 24, and 32 mmol Bi/AC composites entailing the mass transformation phases from precursor to Bi2O3 and removal of the amorphous residue in the form of SO 4 2 − , HNO3, and NO3− in regions I and II at temperatures around 220–380°C [20]. In region III, the formations of ⍺-Bi2O3 at temperatures around 400–500°C [25] and β-Bi2O3 at temperatures around 500–650°C [26] were shown. Additionally, at temperatures around 650–700°C, the conversion of β-Bi2O3 to γ-Bi2O3 and further to α-Bi2O3 [25] was depicted. The pattern of the formation and phase transformation of bismuth oxide in bismuth oxide/commercial activated carbon composites is similar to that of bismuth oxide composites/rice husk-activated carbon composite as reported by Astuti et al. [12].

Figure 6 TGA–DTG curves of Bi/AC composites prepared with (a) 8 mmol, (b) 24 mmol, and (c) 32 mmol BNP.
Figure 6

TGA–DTG curves of Bi/AC composites prepared with (a) 8 mmol, (b) 24 mmol, and (c) 32 mmol BNP.

3.2.6 Pore and surface properties

Figure 7 shows that the 8, 24, and 32 mmol Bi/AC composite had similar patterns, whereby the adsorption process ensued from low pressure to the relative pressure of 1 (p/p°). At p/p° = 1, the adsorption process had reached its saturation point or maximum adsorption capacity, which would then be replaced by the desorption process. The 8, 24, and 32 mmol Bi/AC composites all had type IV adsorption isotherms characterized by the presence of loop hysteresis expressive of the porous nature of the materials as they were able to adsorb N2.

Figure 7 N2 adsorption–desorption isotherms of Bi/CA composites prepared with (a) 8 mmol, (b) 24 mmol, and (c) 32 mmol BNP.
Figure 7

N2 adsorption–desorption isotherms of Bi/CA composites prepared with (a) 8 mmol, (b) 24 mmol, and (c) 32 mmol BNP.

Based on the data presented in Table 4, the 8, 24, and 32 mmol Bi/AC composites were all classified as mesoporous materials (2–50 nm pore size) [27]. Table 4 also marks that the 8 mmol Bi/AC composite had a small surface area and pore volume with a fairly large pore size, which can be assumed that the 8 mmol composite had smaller number of pores. The 24 mmol Bi/AC composite had a large surface area and pore volume, as well as small pore size implying a higher number of pores. Meanwhile, the 32 mmol composite had smaller surface area and pore volume than the 24 mmol composite but larger than the 8 mmol composite, with its pore size largest out of all three composites produced. Based on this, it can be concluded that the 32 mmol composite had fewer pores than the 24 mmol composite but had more pores than the 8 mmol composite.

Table 4

GSA analysis results of 8, 24, and 32 mmol Bi/commercial AC composite

Parameter Composite sample
8 mmol Bi/CA 24 mmol Bi/CA 32 mmol Bi/CA Commercial AC
Surface area (m2 g−1) 2.131 8.329 3.514 39.733
Pore volume (cm3 g−1) 0.007 0.022 0.0124 0.032
Pore size (nm) 13.655 11.044 14.167 3.267

Subhan [4] explained that a material with high porosity would give rise to a large resistance, thereby reducing the conductivity value of the material. However, it should be borne in mind that Bi/AC prepared with 32 mmol BNP contains high concentration of BNP as precursor which may results in the highest electrical conductivity compared to other composites [12].

4 Conclusion

Bi/AC composites were successfully synthesized with 8, 24, and 32 mmol variations in the amount of BNP, confirmed by FTIR and XRD analyses. The 8 mmol Bi/AC composite showed the presence of monoclinic Bi2O3 crystals and had an electrical conductivity value of 0.69 × 10−3 S m−1. The 24 and 32 mmol Bi/commercial AC composites showed a low Bi2O3 content based on the XRD characterization, and accordingly portrayed by Bi2O3 lack of appearance in the SEM characterization. The two composites had electrical conductivity values of 0.15 × 10−2 and 0.89 × 10−1 Sm−1, respectively. The three composites produced were all porous materials as they were able to adsorb N2 gas. The electrical conductivity of composites prepared with 24 and 32 mmol BNP could be due to the high content of impurities resulting from precursor BNP. This study is expected to provide a scientific contribution related to the utilization of activated carbon and bismuth oxide in the form of a composite as an alternative material for lithium-ion battery anode. Factors affecting composite properties such as the right composition during the synthesis process need special attention to gain composite with the desired properties.

  1. Funding information: The authors would like to thank the Ministry of Research and Technology for the funding support in the 2021 fiscal year through the basic research scheme with grant No. 225-71/UN7.6.1/PP/2021.

  2. Author contributions: Y.A. – conceptualization; Y.A. and S.T. – data curation and analysis and writing – original draft manuscript; Y.A., A.D., and H.W. – writing – review and validation. All authors have read and agreed to the published version of the manuscript.

  3. Conflict of interest: There is no conflict of interest.

  4. Ethical approval: The conducted research is not related to either human or animal use.

  5. Data availability statement: All data generated or analyzed during this study are included in this published article.

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Received: 2022-09-15
Revised: 2022-10-23
Accepted: 2022-11-01
Published Online: 2022-12-07

© 2022 the author(s), published by De Gruyter

This work is licensed under the Creative Commons Attribution 4.0 International License.

Articles in the same Issue

  1. Regular Articles
  2. Photocatalytic degradation of Rhodamine B in aqueous phase by bimetallic metal-organic framework M/Fe-MOF (M = Co, Cu, and Mg)
  3. Assessment of using electronic portal imaging device for analysing bolus material utilised in radiation therapy
  4. A detailed investigation on highly dense CuZr bulk metallic glasses for shielding purposes
  5. Simulation of gamma-ray shielding properties for materials of medical interest
  6. Environmental impact assesment regulation applications and their analysis in Turkey
  7. Sample age effect on parameters of dynamic nuclear polarization in certain difluorobenzen isomers/MC800 asphaltene suspensions
  8. Passenger demand forecasting for railway systems
  9. Design of a Robust sliding mode controller for bioreactor cultures in overflow metabolism via an interdisciplinary approach
  10. Gamma, neutron, and heavy charged ion shielding properties of Er3+-doped and Sm3+-doped zinc borate glasses
  11. Bridging chiral de-tert-butylcalix[4]arenes: Optical resolution based on column chromatography and structural characterization
  12. Petrology and geochemistry of multiphase post-granitic dikes: A case study from the Gabal Serbal area, Southwestern Sinai, Egypt
  13. Comparison of the yield and purity of plasma exosomes extracted by ultracentrifugation, precipitation, and membrane-based approaches
  14. Bioactive triterpenoids from Indonesian medicinal plant Syzygium aqueum
  15. Investigation of the effects of machining parameters on surface integrity in micromachining
  16. The mesoporous aluminosilicate application as support for bifunctional catalysts for n-hexadecane hydroconversion
  17. Gamma-ray shielding properties of Nd2O3-added iron–boron–phosphate-based composites
  18. Numerical investigation on perforated sheet metals under tension loading
  19. Statistical analysis on the radiological assessment and geochemical studies of granite rocks in the north of Um Taghir area, Eastern Desert, Egypt
  20. Two new polypodane-type bicyclic triterpenoids from mastic
  21. Structural, physical, and mechanical properties of the TiO2 added hydroxyapatite composites
  22. Tribological properties and characterization of borided Co–Mg alloys
  23. Studies on Anemone nemorosa L. extracts; polyphenols profile, antioxidant activity, and effects on Caco-2 cells by in vitro and in silico studies
  24. Mechanical properties, elastic moduli, transmission factors, and gamma-ray-shielding performances of Bi2O3–P2O5–B2O3–V2O5 quaternary glass system
  25. Cyclic connectivity index of bipolar fuzzy incidence graph
  26. The role of passage numbers of donor cells in the development of Arabian Oryx – Cow interspecific somatic cell nuclear transfer embryos
  27. Mechanical property evaluation of tellurite–germanate glasses and comparison of their radiation-shielding characteristics using EPICS2017 to other glass systems
  28. Molecular screening of ionic liquids for CO2 absorption and molecular dynamic simulation
  29. Microwave-assisted preparation of Ag/Fe magnetic biochar from clivia leaves for adsorbing daptomycin antibiotics
  30. Iminodisuccinic acid enhances antioxidant and mineral element accumulation in young leaves of Ziziphus jujuba
  31. Cytotoxic activity of guaiane-type sesquiterpene lactone (deoxycynaropicrin) isolated from the leaves of Centaurothamnus maximus
  32. Effects of welding parameters on the angular distortion of welded steel plates
  33. Simulation of a reactor considering the Stamicarbon, Snamprogetti, and Toyo patents for obtaining urea
  34. Effect of different ramie (Boehmeria nivea L. Gaud) cultivars on the adsorption of heavy metal ions cadmium and lead in the remediation of contaminated farmland soils
  35. Impact of a live bacterial-based direct-fed microbial (DFM) postpartum and weaning system on performance, mortality, and health of Najdi lambs
  36. Anti-tumor effect of liposomes containing extracted Murrayafoline A against liver cancer cells in 2D and 3D cultured models
  37. Physicochemical properties and some mineral concentration of milk samples from different animals and altitudes
  38. Copper(ii) complexes supported by modified azo-based ligands: Nucleic acid binding and molecular docking studies
  39. Diagnostic and therapeutic radioisotopes in nuclear medicine: Determination of gamma-ray transmission factors and safety competencies of high-dense and transparent glassy shields
  40. Calculation of NaI(Tl) detector efficiency using 226Ra, 232Th, and 40K radioisotopes: Three-phase Monte Carlo simulation study
  41. Isolation and identification of unstable components from Caesalpinia sappan by high-speed counter-current chromatography combined with preparative high-performance liquid chromatography
  42. Quantification of biomarkers and evaluation of antioxidant, anti-inflammatory, and cytotoxicity properties of Dodonaea viscosa grown in Saudi Arabia using HPTLC technique
  43. Characterization of the elastic modulus of ceramic–metal composites with physical and mechanical properties by ultrasonic technique
  44. GC-MS analysis of Vespa velutina auraria Smith and its anti-inflammatory and antioxidant activities in vitro
  45. Texturing of nanocoatings for surface acoustic wave-based sensors for volatile organic compounds
  46. Insights into the molecular basis of some chalcone analogues as potential inhibitors of Leishmania donovani: An integrated in silico and in vitro study
  47. (1R,2S,5R)-5-Methyl-2-(propan-2-yl)cyclohexyl 4-amino-3-phenylbutanoate hydrochloride: Synthesis and anticonvulsant activity
  48. On the relative extraction rates of colour compounds and caffeine during brewing, an investigation of tea over time and temperature
  49. Characterization of egg shell powder-doped ceramic–metal composites
  50. Rapeseed oil-based hippurate amide nanocomposite coating material for anticorrosive and antibacterial applications
  51. Chemically modified Teucrium polium (Lamiaceae) plant act as an effective adsorbent tool for potassium permanganate (KMnO4) in wastewater remediation
  52. Efficiency analysis of photovoltaic systems installed in different geographical locations
  53. Risk prioritization model driven by success factor in the light of multicriteria decision making
  54. Theoretical investigations on the excited-state intramolecular proton transfer in the solvated 2-hydroxy-1-naphthaldehyde carbohydrazone
  55. Mechanical and gamma-ray shielding examinations of Bi2O3–PbO–CdO–B2O3 glass system
  56. Machine learning-based forecasting of potability of drinking water through adaptive boosting model
  57. The potential effect of the Rumex vesicarius water seeds extract treatment on mice before and during pregnancy on the serum enzymes and the histology of kidney and liver
  58. Impact of benzimidazole functional groups on the n-doping properties of benzimidazole derivatives
  59. Extraction of red pigment from Chinese jujube peel and the antioxidant activity of the pigment extracts
  60. Flexural strength and thermal properties of carbon black nanoparticle reinforced epoxy composites obtained from waste tires
  61. A focusing study on radioprotective and antioxidant effects of Annona muricata leaf extract in the circulation and liver tissue: Clinical and experimental studies
  62. Clinical comprehensive and experimental assessment of the radioprotective effect of Annona muricata leaf extract to prevent cellular damage in the ileum tissue
  63. Effect of WC content on ultrasonic properties, thermal and electrical conductivity of WC–Co–Ni–Cr composites
  64. Influence of various class cleaning agents for prosthesis on Co–Cr alloy surface
  65. The synthesis of nanocellulose-based nanocomposites for the effective removal of hexavalent chromium ions from aqueous solution
  66. Study on the influence of physical interlayers on the remaining oil production under different development modes
  67. Optimized linear regression control of DC motor under various disturbances
  68. Influence of different sample preparation strategies on hypothesis-driven shotgun proteomic analysis of human saliva
  69. Determination of flow distance of the fluid metal due to fluidity in ductile iron casting by artificial neural networks approach
  70. Investigation of mechanical activation effect on high-volume natural pozzolanic cements
  71. In vitro: Anti-coccidia activity of Calotropis procera leaf extract on Eimeria papillata oocysts sporulation and sporozoite
  72. Determination of oil composition of cowpea (Vigna unguiculata L.) seeds under influence of organic fertilizer forms
  73. Activated partial thromboplastin time maybe associated with the prognosis of papillary thyroid carcinoma
  74. Treatment of rat brain ischemia model by NSCs-polymer scaffold transplantation
  75. Lead and cadmium removal with native yeast from coastal wetlands
  76. Characterization of electroless Ni-coated Fe–Co composite using powder metallurgy
  77. Ferrate synthesis using NaOCl and its application for dye removal
  78. Antioxidant, antidiabetic, and anticholinesterase potential of Chenopodium murale L. extracts using in vitro and in vivo approaches
  79. Study on essential oil, antioxidant activity, anti-human prostate cancer effects, and induction of apoptosis by Equisetum arvense
  80. Experimental study on turning machine with permanent magnetic cutting tool
  81. Numerical simulation and mathematical modeling of the casting process for pearlitic spheroidal graphite cast iron
  82. Design, synthesis, and cytotoxicity evaluation of novel thiophene, pyrimidine, pyridazine, and pyridine: Griseofulvin heterocyclic extension derivatives
  83. Isolation and identification of promising antibiotic-producing bacteria
  84. Ultrasonic-induced reversible blood–brain barrier opening: Safety evaluation into the cellular level
  85. Evaluation of phytochemical and antioxidant potential of various extracts from traditionally used medicinal plants of Pakistan
  86. Effect of calcium lactate in standard diet on selected markers of oxidative stress and inflammation in ovariectomized rats
  87. Identification of crucial salivary proteins/genes and pathways involved in pathogenesis of temporomandibular disorders
  88. Zirconium-modified attapulgite was used for removing of Cr(vi) in aqueous solution
  89. The stress distribution of different types of restorative materials in primary molar
  90. Reducing surface heat loss in steam boilers
  91. Deformation behavior and formability of friction stir processed DP600 steel
  92. Synthesis and characterization of bismuth oxide/commercial activated carbon composite for battery anode
  93. Phytochemical analysis of Ziziphus jujube leaf at different foliar ages based on widely targeted metabolomics
  94. Effects of in ovo injection of black cumin (Nigella sativa) extract on hatching performance of broiler eggs
  95. Separation and evaluation of potential antioxidant, analgesic, and anti-inflammatory activities of limonene-rich essential oils from Citrus sinensis (L.)
  96. Bioactivity of a polyhydroxy gorgostane steroid from Xenia umbellata
  97. BiCAM-based automated scoring system for digital logic circuit diagrams
  98. Analysis of standard systems with solar monitoring systems
  99. Structural and spectroscopic properties of voriconazole and fluconazole – Experimental and theoretical studies
  100. New plant resistance inducers based on polyamines
  101. Experimental investigation of single-lap bolted and bolted/bonded (hybrid) joints of polymeric plates
  102. Investigation of inlet air pressure and evaporative cooling of four different cogeneration cycles
  103. Review Articles
  104. Comprehensive review on synthesis, physicochemical properties, and application of activated carbon from the Arecaceae plants for enhanced wastewater treatment
  105. Research progress on speciation analysis of arsenic in traditional Chinese medicine
  106. Recent modified air-assisted liquid–liquid microextraction applications for medicines and organic compounds in various samples: A review
  107. An insight on Vietnamese bio-waste materials as activated carbon precursors for multiple applications in environmental protection
  108. Antimicrobial activities of the extracts and secondary metabolites from Clausena genus – A review
  109. Bioremediation of organic/heavy metal contaminants by mixed cultures of microorganisms: A review
  110. Sonodynamic therapy for breast cancer: A literature review
  111. Recent progress of amino acid transporters as a novel antitumor target
  112. Aconitum coreanum Rapaics: Botany, traditional uses, phytochemistry, pharmacology, and toxicology
  113. Corrigendum
  114. Corrigendum to “Petrology and geochemistry of multiphase post-granitic dikes: A case study from the Gabal Serbal area, Southwestern Sinai, Egypt”
  115. Corrigendum to “Design of a Robust sliding mode controller for bioreactor cultures in overflow metabolism via an interdisciplinary approach”
  116. Corrigendum to “Statistical analysis on the radiological assessment and geochemical studies of granite rocks in the north of Um Taghir area, Eastern Desert, Egypt”
  117. Corrigendum to “Aroma components of tobacco powder from different producing areas based on gas chromatography ion mobility spectrometry”
  118. Corrigendum to “Mechanical properties, elastic moduli, transmission factors, and gamma-ray-shielding performances of Bi2O3–P2O5–B2O3–V2O5 quaternary glass system”
  119. Erratum
  120. Erratum to “Copper(ii) complexes supported by modified azo-based ligands: Nucleic acid binding and molecular docking studies”
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https://doi.org/10.1515/chem-2022-0247
Keywords for this article
bismuth oxide; activated carbon; hydrothermal; battery; anode
Creative Commons
BY 4.0

Articles in the same Issue

  1. Regular Articles
  2. Photocatalytic degradation of Rhodamine B in aqueous phase by bimetallic metal-organic framework M/Fe-MOF (M = Co, Cu, and Mg)
  3. Assessment of using electronic portal imaging device for analysing bolus material utilised in radiation therapy
  4. A detailed investigation on highly dense CuZr bulk metallic glasses for shielding purposes
  5. Simulation of gamma-ray shielding properties for materials of medical interest
  6. Environmental impact assesment regulation applications and their analysis in Turkey
  7. Sample age effect on parameters of dynamic nuclear polarization in certain difluorobenzen isomers/MC800 asphaltene suspensions
  8. Passenger demand forecasting for railway systems
  9. Design of a Robust sliding mode controller for bioreactor cultures in overflow metabolism via an interdisciplinary approach
  10. Gamma, neutron, and heavy charged ion shielding properties of Er3+-doped and Sm3+-doped zinc borate glasses
  11. Bridging chiral de-tert-butylcalix[4]arenes: Optical resolution based on column chromatography and structural characterization
  12. Petrology and geochemistry of multiphase post-granitic dikes: A case study from the Gabal Serbal area, Southwestern Sinai, Egypt
  13. Comparison of the yield and purity of plasma exosomes extracted by ultracentrifugation, precipitation, and membrane-based approaches
  14. Bioactive triterpenoids from Indonesian medicinal plant Syzygium aqueum
  15. Investigation of the effects of machining parameters on surface integrity in micromachining
  16. The mesoporous aluminosilicate application as support for bifunctional catalysts for n-hexadecane hydroconversion
  17. Gamma-ray shielding properties of Nd2O3-added iron–boron–phosphate-based composites
  18. Numerical investigation on perforated sheet metals under tension loading
  19. Statistical analysis on the radiological assessment and geochemical studies of granite rocks in the north of Um Taghir area, Eastern Desert, Egypt
  20. Two new polypodane-type bicyclic triterpenoids from mastic
  21. Structural, physical, and mechanical properties of the TiO2 added hydroxyapatite composites
  22. Tribological properties and characterization of borided Co–Mg alloys
  23. Studies on Anemone nemorosa L. extracts; polyphenols profile, antioxidant activity, and effects on Caco-2 cells by in vitro and in silico studies
  24. Mechanical properties, elastic moduli, transmission factors, and gamma-ray-shielding performances of Bi2O3–P2O5–B2O3–V2O5 quaternary glass system
  25. Cyclic connectivity index of bipolar fuzzy incidence graph
  26. The role of passage numbers of donor cells in the development of Arabian Oryx – Cow interspecific somatic cell nuclear transfer embryos
  27. Mechanical property evaluation of tellurite–germanate glasses and comparison of their radiation-shielding characteristics using EPICS2017 to other glass systems
  28. Molecular screening of ionic liquids for CO2 absorption and molecular dynamic simulation
  29. Microwave-assisted preparation of Ag/Fe magnetic biochar from clivia leaves for adsorbing daptomycin antibiotics
  30. Iminodisuccinic acid enhances antioxidant and mineral element accumulation in young leaves of Ziziphus jujuba
  31. Cytotoxic activity of guaiane-type sesquiterpene lactone (deoxycynaropicrin) isolated from the leaves of Centaurothamnus maximus
  32. Effects of welding parameters on the angular distortion of welded steel plates
  33. Simulation of a reactor considering the Stamicarbon, Snamprogetti, and Toyo patents for obtaining urea
  34. Effect of different ramie (Boehmeria nivea L. Gaud) cultivars on the adsorption of heavy metal ions cadmium and lead in the remediation of contaminated farmland soils
  35. Impact of a live bacterial-based direct-fed microbial (DFM) postpartum and weaning system on performance, mortality, and health of Najdi lambs
  36. Anti-tumor effect of liposomes containing extracted Murrayafoline A against liver cancer cells in 2D and 3D cultured models
  37. Physicochemical properties and some mineral concentration of milk samples from different animals and altitudes
  38. Copper(ii) complexes supported by modified azo-based ligands: Nucleic acid binding and molecular docking studies
  39. Diagnostic and therapeutic radioisotopes in nuclear medicine: Determination of gamma-ray transmission factors and safety competencies of high-dense and transparent glassy shields
  40. Calculation of NaI(Tl) detector efficiency using 226Ra, 232Th, and 40K radioisotopes: Three-phase Monte Carlo simulation study
  41. Isolation and identification of unstable components from Caesalpinia sappan by high-speed counter-current chromatography combined with preparative high-performance liquid chromatography
  42. Quantification of biomarkers and evaluation of antioxidant, anti-inflammatory, and cytotoxicity properties of Dodonaea viscosa grown in Saudi Arabia using HPTLC technique
  43. Characterization of the elastic modulus of ceramic–metal composites with physical and mechanical properties by ultrasonic technique
  44. GC-MS analysis of Vespa velutina auraria Smith and its anti-inflammatory and antioxidant activities in vitro
  45. Texturing of nanocoatings for surface acoustic wave-based sensors for volatile organic compounds
  46. Insights into the molecular basis of some chalcone analogues as potential inhibitors of Leishmania donovani: An integrated in silico and in vitro study
  47. (1R,2S,5R)-5-Methyl-2-(propan-2-yl)cyclohexyl 4-amino-3-phenylbutanoate hydrochloride: Synthesis and anticonvulsant activity
  48. On the relative extraction rates of colour compounds and caffeine during brewing, an investigation of tea over time and temperature
  49. Characterization of egg shell powder-doped ceramic–metal composites
  50. Rapeseed oil-based hippurate amide nanocomposite coating material for anticorrosive and antibacterial applications
  51. Chemically modified Teucrium polium (Lamiaceae) plant act as an effective adsorbent tool for potassium permanganate (KMnO4) in wastewater remediation
  52. Efficiency analysis of photovoltaic systems installed in different geographical locations
  53. Risk prioritization model driven by success factor in the light of multicriteria decision making
  54. Theoretical investigations on the excited-state intramolecular proton transfer in the solvated 2-hydroxy-1-naphthaldehyde carbohydrazone
  55. Mechanical and gamma-ray shielding examinations of Bi2O3–PbO–CdO–B2O3 glass system
  56. Machine learning-based forecasting of potability of drinking water through adaptive boosting model
  57. The potential effect of the Rumex vesicarius water seeds extract treatment on mice before and during pregnancy on the serum enzymes and the histology of kidney and liver
  58. Impact of benzimidazole functional groups on the n-doping properties of benzimidazole derivatives
  59. Extraction of red pigment from Chinese jujube peel and the antioxidant activity of the pigment extracts
  60. Flexural strength and thermal properties of carbon black nanoparticle reinforced epoxy composites obtained from waste tires
  61. A focusing study on radioprotective and antioxidant effects of Annona muricata leaf extract in the circulation and liver tissue: Clinical and experimental studies
  62. Clinical comprehensive and experimental assessment of the radioprotective effect of Annona muricata leaf extract to prevent cellular damage in the ileum tissue
  63. Effect of WC content on ultrasonic properties, thermal and electrical conductivity of WC–Co–Ni–Cr composites
  64. Influence of various class cleaning agents for prosthesis on Co–Cr alloy surface
  65. The synthesis of nanocellulose-based nanocomposites for the effective removal of hexavalent chromium ions from aqueous solution
  66. Study on the influence of physical interlayers on the remaining oil production under different development modes
  67. Optimized linear regression control of DC motor under various disturbances
  68. Influence of different sample preparation strategies on hypothesis-driven shotgun proteomic analysis of human saliva
  69. Determination of flow distance of the fluid metal due to fluidity in ductile iron casting by artificial neural networks approach
  70. Investigation of mechanical activation effect on high-volume natural pozzolanic cements
  71. In vitro: Anti-coccidia activity of Calotropis procera leaf extract on Eimeria papillata oocysts sporulation and sporozoite
  72. Determination of oil composition of cowpea (Vigna unguiculata L.) seeds under influence of organic fertilizer forms
  73. Activated partial thromboplastin time maybe associated with the prognosis of papillary thyroid carcinoma
  74. Treatment of rat brain ischemia model by NSCs-polymer scaffold transplantation
  75. Lead and cadmium removal with native yeast from coastal wetlands
  76. Characterization of electroless Ni-coated Fe–Co composite using powder metallurgy
  77. Ferrate synthesis using NaOCl and its application for dye removal
  78. Antioxidant, antidiabetic, and anticholinesterase potential of Chenopodium murale L. extracts using in vitro and in vivo approaches
  79. Study on essential oil, antioxidant activity, anti-human prostate cancer effects, and induction of apoptosis by Equisetum arvense
  80. Experimental study on turning machine with permanent magnetic cutting tool
  81. Numerical simulation and mathematical modeling of the casting process for pearlitic spheroidal graphite cast iron
  82. Design, synthesis, and cytotoxicity evaluation of novel thiophene, pyrimidine, pyridazine, and pyridine: Griseofulvin heterocyclic extension derivatives
  83. Isolation and identification of promising antibiotic-producing bacteria
  84. Ultrasonic-induced reversible blood–brain barrier opening: Safety evaluation into the cellular level
  85. Evaluation of phytochemical and antioxidant potential of various extracts from traditionally used medicinal plants of Pakistan
  86. Effect of calcium lactate in standard diet on selected markers of oxidative stress and inflammation in ovariectomized rats
  87. Identification of crucial salivary proteins/genes and pathways involved in pathogenesis of temporomandibular disorders
  88. Zirconium-modified attapulgite was used for removing of Cr(vi) in aqueous solution
  89. The stress distribution of different types of restorative materials in primary molar
  90. Reducing surface heat loss in steam boilers
  91. Deformation behavior and formability of friction stir processed DP600 steel
  92. Synthesis and characterization of bismuth oxide/commercial activated carbon composite for battery anode
  93. Phytochemical analysis of Ziziphus jujube leaf at different foliar ages based on widely targeted metabolomics
  94. Effects of in ovo injection of black cumin (Nigella sativa) extract on hatching performance of broiler eggs
  95. Separation and evaluation of potential antioxidant, analgesic, and anti-inflammatory activities of limonene-rich essential oils from Citrus sinensis (L.)
  96. Bioactivity of a polyhydroxy gorgostane steroid from Xenia umbellata
  97. BiCAM-based automated scoring system for digital logic circuit diagrams
  98. Analysis of standard systems with solar monitoring systems
  99. Structural and spectroscopic properties of voriconazole and fluconazole – Experimental and theoretical studies
  100. New plant resistance inducers based on polyamines
  101. Experimental investigation of single-lap bolted and bolted/bonded (hybrid) joints of polymeric plates
  102. Investigation of inlet air pressure and evaporative cooling of four different cogeneration cycles
  103. Review Articles
  104. Comprehensive review on synthesis, physicochemical properties, and application of activated carbon from the Arecaceae plants for enhanced wastewater treatment
  105. Research progress on speciation analysis of arsenic in traditional Chinese medicine
  106. Recent modified air-assisted liquid–liquid microextraction applications for medicines and organic compounds in various samples: A review
  107. An insight on Vietnamese bio-waste materials as activated carbon precursors for multiple applications in environmental protection
  108. Antimicrobial activities of the extracts and secondary metabolites from Clausena genus – A review
  109. Bioremediation of organic/heavy metal contaminants by mixed cultures of microorganisms: A review
  110. Sonodynamic therapy for breast cancer: A literature review
  111. Recent progress of amino acid transporters as a novel antitumor target
  112. Aconitum coreanum Rapaics: Botany, traditional uses, phytochemistry, pharmacology, and toxicology
  113. Corrigendum
  114. Corrigendum to “Petrology and geochemistry of multiphase post-granitic dikes: A case study from the Gabal Serbal area, Southwestern Sinai, Egypt”
  115. Corrigendum to “Design of a Robust sliding mode controller for bioreactor cultures in overflow metabolism via an interdisciplinary approach”
  116. Corrigendum to “Statistical analysis on the radiological assessment and geochemical studies of granite rocks in the north of Um Taghir area, Eastern Desert, Egypt”
  117. Corrigendum to “Aroma components of tobacco powder from different producing areas based on gas chromatography ion mobility spectrometry”
  118. Corrigendum to “Mechanical properties, elastic moduli, transmission factors, and gamma-ray-shielding performances of Bi2O3–P2O5–B2O3–V2O5 quaternary glass system”
  119. Erratum
  120. Erratum to “Copper(ii) complexes supported by modified azo-based ligands: Nucleic acid binding and molecular docking studies”
  121. Special Issue on Applied Biochemistry and Biotechnology (ABB 2021)
  122. Study of solidification and stabilization of heavy metals by passivators in heavy metal-contaminated soil
  123. Human health risk assessment and distribution of VOCs in a chemical site, Weinan, China
  124. Preparation and characterization of Sparassis latifolia β-glucan microcapsules
  125. Special Issue on the Conference of Energy, Fuels, Environment 2020
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