| Theory and application of cyclic voltammetry for measurement of fast electrode kinetics at microdisk electrode |
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| 作者姓名： | JIN Bao-Kang ZHANG Jian-Rong ZHANG Zu-Xun |
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| 作者单位： | JIN，Bao-Kang ZHANG，Jian-Rong ZHANG，Zu-XunDepartment of Chemistry，Nanjing University，Nanjing，Jiangsu 210093，China |
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| 基金项目： | Project supported by the National Natural Science Foundation of China. |
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| 摘 要： | An analytical expression describing voltammetric behaviors responses at microdisk electrode for various diffusion conditions and degrees of reversibility is reported in this paper. Results of theoretical calculation made it possible to use cyclic voltammetry to evaluate heterogeneous rate constants under intermediate diffusion conditions. At relatively low scan rate, the distortion of current-voltage can be reduced due to small iR drops and charging current. The effects of transfer coefficient, a, kinetic parameter, (=k0r/4D), and switching potential, s, on potential peak separation are discussed in detail. The relationship obtained in this paper between potential peak separation and \ is in good agreement with that in Ref. 14, whose authors have got their results by using digital simulation technique. After the experiment of Fe(CN)64- oxidation, k0 and a were obtained by the theory of this paper. The result agrees with that in Ref. 19.
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Theory and application of cyclic voltammetry for measurement of fast electrode kinetics at microdisk electrode |
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| JIN,Bao-Kang ZHANG,Jian-Rong ZHANG,Zu-Xun.Theory and application of cyclic voltammetry for measurement of fast electrode kinetics at microdisk electrode[J].Chinese Journal of Chemistry,1996,14(4):338-347. |
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| Authors: | JIN Bao-Kang ZHANG Jian-Rong ZHANG Zu-Xun |
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| Institution: | JIN,Bao-Kang ZHANG,Jian-Rong ZHANG,Zu-XunDepartment of Chemistry,Nanjing University,Nanjing,Jiangsu 210093,China |
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| Abstract: | An analytical expression describing voltammetric behaviors responses at microdisk electrode for various diffusion conditions and degrees of reversibility is reported in this paper. Results of theoretical calculation made it possible to use cyclic voltammetry to evaluate heterogeneous rate constants under intermediate diffusion conditions. At relatively low scan rate, the distortion of current-voltage can be reduced due to small iR drops and charging current. The effects of transfer coefficient, a, kinetic parameter, (=k0r/4D), and switching potential, s, on potential peak separation are discussed in detail. The relationship obtained in this paper between potential peak separation and \ is in good agreement with that in Ref. 14, whose authors have got their results by using digital simulation technique. After the experiment of Fe(CN)64- oxidation, k0 and a were obtained by the theory of this paper. The result agrees with that in Ref. 19. |
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| Keywords: | Microdisk electrode kinetics cyclic voltammetry |
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