The Electrochemical Oxidation of Sulphite on Gold Electrodes
At a Glance
Section titled âAt a Glanceâ| Metadata | Details |
|---|---|
| Publication Date | 2019-06-12 |
| Journal | Electroanalysis |
| Authors | Xiaosheng Cai, Chuhong Lin, John S. Foord, Richard G. Compton |
| Institutions | University of Oxford, Institute of Intelligent Machines |
| Citations | 10 |
Abstract
Section titled âAbstractâAbstract The electroâoxidation of sulphite is studied in acid media on gold macroelectrodes and Au particle array modified boron doped diamond electrodes. The sulphite oxidation proceeds through a oneâelectron transfer process followed by a chemical step of second order (EC 2 mechanism), as evidenced by experimental voltammetry and digital simulation for both gold macroelectrodes and gold particle modified substrates. The diffusion coefficient of sulphite is calculated consistently for both cases at about 4Ă10 â9 m 2 s â1 , with the reverse peak behaviour concentration dependent. The arrays are made by electrodeposition and show a morphological transition from a quasiâspherical to a star shape as the growth time of the particles increases. Kinetic parameters inferred from the electroâoxidation at the macroelectrode can be successfully applied to model the gold particle modified electrode data to confirm the EC 2 mechanism, whilst recognising the overlapping diffusion layers of adjacent gold particles.