The Electrochemical Oxidation of Sulphite on Gold Electrodes,Electroanalysis

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The Electrochemical Oxidation of Sulphite on Gold Electrodes
Electroanalysis ( IF 2.7 ) Pub Date : 2019-06-12 , DOI: 10.1002/elan.201900289
Xiaosheng Cai ₁ , Chuhong Lin _{2,

3} , John S. Foord ₁ , Richard G. Compton ₂

Affiliation

The electro‐oxidation 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 one‐electron transfer process followed by a chemical step of second order (EC₂ 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 4×10⁻⁹ m² s⁻¹, with the reverse peak behaviour concentration dependent. The arrays are made by electrodeposition and show a morphological transition from a quasi‐spherical to a star shape as the growth time of the particles increases. Kinetic parameters inferred from the electro‐oxidation at the macroelectrode can be successfully applied to model the gold particle modified electrode data to confirm the EC₂ mechanism, whilst recognising the overlapping diffusion layers of adjacent gold particles.

中文翻译：

金电极上亚硫酸盐的电化学氧化

在酸性介质中，在金大电极和金粒子阵列修饰的掺硼金刚石电极上研究了亚硫酸盐的电氧化。亚硫酸盐的氧化过程是通过单电子转移过程进行的，随后是第二阶化学步骤（EC ₂机理），这已通过实验伏安法和数字模拟对金大电极和金粒子修饰的基材进行了证明。两种情况下，在大约4×10 ^-9 m ² s ^-1的情况下，一致地计算了亚硫酸盐的扩散系数，与反向峰行为的浓度有关。这些阵列是通过电沉积制成的，随着颗粒的生长时间增加，其显示出从准球形到星形的形态过渡。从大电极上的电氧化推断出的动力学参数可以成功地应用于对金颗粒修饰电极数据进行建模，以确认EC ₂机理，同时识别相邻金颗粒的重叠扩散层。

更新日期：2019-06-12

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