Electrochemical reduction of U(VI) in H2SO4 at gold nanoporous film electrode
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Manoj K. Sharma
Abstract
Gold nanoporous film (AuNPF) was grown on gold substrate by electrochemical oxidation of the gold electrode at 5 V for 180 s in phosphate buffer (pH 7.4) followed by reduction of the oxidized gold with ascorbic acid solution. Atomic force microscopy (AFM) showed the porous nature of the prepared film. In cyclic voltammetric (CV) studies, anodic shift of 141 mV in the cathodic peak potential for the reduction of UO22+ in 0.5 M H2SO4 was observed at the AuNPF electrode, showing evidence of its enhanced electrochemical activity as compared to that of the bare Au electrode. The charge transfer studies done using electrochemical impedance spectroscopy indicated similar rates of the heterogeneous electron-transfer kinetics at the bare Au and the AuNPF electrodes. The Cottrell plots obtained from the chronoamperometric experiments showed the Cottrell linearity at the bare Au electrode. In contrast, the Cottrell plot of the AuNPF electrode showed deviation from the linearity at longer times and this is characteristic of the thin-layer diffusion coupled with the electron transfer. Therefore, the observed anodic shift at the AuNPF electrode for the reduction of UO22+ was attributed to the contribution from thin-layer diffusion within the gold nanoporous film.
© by Oldenbourg Wissenschaftsverlag, München, Germany
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Articles in the same Issue
- Cross section measurements of a few threshold reactions induced by fast neutrons from an Am/Be source: integral tests of differential neutron reaction cross section data
- Prediction of the thermal release of transactinide elements (112 ≤ Z ≤ 116) from metals
- Complexation thermodynamics and structural studies of trivalent actinide and lanthanide complexes with DTPA, MS-325 and HMDTPA
- Synthesis and characterization of thorium, uranium and cerium oxide nanoparticles
- Improved radioanalytical method for the simultaneous determination of Th, U, Np, Pu and Am(Cm) on a single TRU column by alpha spectrometry and ICP-MS
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- The redox chemistry of neptunium in γ-irradiated aqueous nitric acid
- The incorporation of europium into apatite: anew explanation
- Instrumental neutron activation analysis for the study of size-fractionated airborne particulate matter samples
