The kinetics of electroreduction of peroxodisulfate ions on single crystal cadmium and bismuth electrodes

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• 作者：T. Thomberg ; J. Nerut ; R. Jä ; ger ; P. Mö ; ller ; K. Lust and E. Lust
• 关键词：Electroreduction ; Peroxodisulfate ; Cadmium single crystal ; Rate constant of heterogeneous reaction ; Apparent transfer coefficient
• 刊名：Journal of Electroanalytical Chemistry
• 出版年：2005
• 期刊代码：27_00220728
• 类别：ph
• 出版时间：2005
• 卷：582
• 期：1-2
• 页码：130-143
• 文件大小：438 K

摘要

The electroreduction of the peroxodisulfate anions on the electrochemically polished (EP) Cd(0 0 0 1), Bi(1 1 1) and align="absbottom" border="0" height=18 width=56> planes has been studied by cyclic voltammetry, rotating disc electrode and impedance methods. The rate constant values of the heterogeneous electroreduction reaction of the align="absbottom" border="0" height=20 width=42> anion on the EP Cd(0 0 0 1) and Bi(h k l) planes dependent on electrode polarisation and base electrolyte concentration have been calculated. The values of apparent transfer coefficient α_app corrected for the double layer effect (α_app 0.15) only very weakly depend on the electrode potential and base electrolyte concentration. The very low values of the apparent charge transfer coefficient for align="absbottom" border="0" height=20 width=42> electroreduction show that the activationless charge transfer mechanism is valid for EP Cd(0 0 0 1) and EP Bi(h k l) electrodes in various surface inactive base electrolyte solutions. This conclusion is in a good agreement with the theoretical models for the high hydrogen overvoltage metals based on the diabatic charge transfer mechanism from the metal to an ion [R.R. Nazmutdinov, D.V. Gluhov, O.A. Petrii, G.A. Tsirlina, G.N. Botikova, J. Electroanal. Chem. 552 (2003) 261].