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Capacitive performance of electrochemically deposited Co/Ni oxides/hydroxides on polythiophene-coated carbon-cloth

  • Gülten Atun EMAIL logo , Filiz Şahin , Elif Türker Acar ORCID logo and Sinem Ortaboy
Published/Copyright: December 10, 2021
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Journal of Polymer Engineering
From the journal Journal of Polymer Engineering Volume 42 Issue 2

Abstract

Cobalt, nickel, and their mixed hydroxides were electrochemically deposited on polythiophene-coated carbon-cloth substrate to develop new pseudo-capacitive electrodes for energy storage devices. Thiophene was electro-polymerized on carbon-cloth by the potentiodynamic method in acetonitrile containing 1-butyl-2,3-dimethylimidazolium hexafluorophosphate ionic-liquid as supporting electrolyte. The scanning-electron-microscopy images imply that flower-like Co(OH)2 microstructures deposited on bamboo-like polythiophene coatings on carbon-fibers but they are covered by net curtain like thin Ni(OH)2 layer. The Co-Ni layered-double-hydroxide deposited from their equimolar sulfate solutions is composed of large aggregates. The electron-dispersive-spectrum exhibits that Co/Ni ratio equals unity in the layered-double-hydroxide. The capacitances of Co, Ni, and Co-Ni hydroxide-coated PTh electrodes are 100, 569, and 221 F/g at 5 mA/cm2 in 1 M KOH solution, respectively. Their corresponding oxides obtained by calcination at 450 °C in de-aerated medium possess higher capacitance up to 911, 643, and 696 F/g at 2 A/cm2. The shape of cyclic-voltammetry and galvanostatic-charge-discharge curves, as well as the Nyquist plots derived from electrochemical-impedance-spectroscopy measurements, reveal that hydroxide coatings on the polythiophene-coated carbon-cloth are more promising electrode materials for supercapacitor applications. The mixed hydroxide-coated electrode shows good cyclic stability of 100% after 400 cycles at 5 mA/cm2.

Keywords: carbon-cloth; cobalt hydroxide; nickel hydroxide; polythiophene; supercapacitor
Corresponding author: Gülten Atun, Department of Chemistry, Engineering Faculty, Istanbul University-Cerrahpaşa, 34320 Avcılar, Istanbul, Turkey, E-mail:

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: None declared.

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2021-02-15
Accepted: 2021-10-25
Published Online: 2021-12-10
Published in Print: 2022-02-23

© 2021 Walter de Gruyter GmbH, Berlin/Boston

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https://doi.org/10.1515/polyeng-2021-0049
Keywords for this article
carbon-cloth; cobalt hydroxide; nickel hydroxide; polythiophene; supercapacitor

Articles in the same Issue

  1. Frontmatter
  2. Material Properties
  3. Dynamic crystallization behavior of PA-12/PP-MWCNT nanocomposites: non-isothermal kinetics approach
  4. Effect of antiblock and slip additives on the properties of tubular quenched polypropylene film
  5. A local green composite study: the effect of edible oil on the morphological and mechanical properties of PBS/bentonite composite
  6. Effect of infill density and pattern on the specific load capacity of FDM 3D-printed PLA multi-layer sandwich
  7. Improving the rheological properties of water-based calcium bentonite drilling fluids using water-soluble polymers in high temperature applications
  8. Mechanical, thermal and morphological properties of polyoxymethylene nanocomposite for application in gears of diaphragm gas meters
  9. Preparation and Assembly
  10. Capacitive performance of electrochemically deposited Co/Ni oxides/hydroxides on polythiophene-coated carbon-cloth
  11. Engineering and Processing
  12. Nano-SiO2/hydroxyethyl cellulose nanocomposite used for 210 °C sedimentation control of petroleum drilling fluid
  13. Removal of crystal violet from water by poly acrylonitrile-co-sodium methallyl sulfonate (AN69) and poly acrylic acid (PAA) synthetic membranes
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