The Mechanism of Electrochemical Oxidation of Sulphite on Gold Nanoparticles
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2019-05-01 |
| Journal | ECS Meeting Abstracts |
| Authors | Xiaosheng Cai, John S. Foord, Richard G. Compton |
Abstract
Section titled āAbstractāThe electrooxidation of sulphite has been studied in acid solution on a boron doped diamond electrode modified by gold nanoparticles. The Au nanoparticles are deposited by pulse deposition which involves nucleation and growth steps. The morphology evolves from sphere to dendrite with the increasing of growth time. Simultaneously the interparticle distance decreases leading to the high overlapping of diffusion layer of each Au particle and therefore the formation of a linear planar diffusion. The voltammetry for sulphite oxidation shows the dependence of the square root of scan rates and concentrations. When the concentration is decreased, the current of reverse reduction peak emerges, suggesting an EC2 mechanism (a one-electron transfer process followed by a dimerization chemical reaction). The digital simulation fits the experimental voltammograms well, further confirming the proposed mechanism.