Heterogeneous Consecutive Electron Transfer at Graphite Electrodes under Steady State

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• 作者：Xiaoquan Lu ; Ping Sun ; Dongna Yao ; Bowan Wu ; Zhonghua Xue ; Xibing Zhou ; Ruiping Sun ; Li Li ; Xiuhui Liu
• 刊名：Analytical Chemistry
• 出版年：2010
• 出版时间：October 15, 2010
• 年：2010
• 卷：82
• 期：20
• 页码：8598-8603
• 全文大小：269K
• 年卷期：v.82,no.20(October 15, 2010)
• ISSN：1520-6882

文摘

In this report, the theory based on thin-layer cyclic voltammetry (TLCV) for consecutive electron transfer (ET) across the interface between two immiscible electrolyte solutions (ITIES) is well developed and experimentally verified. The voltammetric responses to multistep electron transfer at the ITIES are predicted by numerical simulations. Moreover, the impact of empirical parameters on the shape of the multistep current−voltage curve has been examined. The results obtained not only give information regarding the effect of the concentration ratio of the reactants in two phases and the thin-layer thickness on multistep electron transfer, but also prove the excellent agreement between simulations and experiments. The model system of two-step electron transfer of ZnTPP/ [Fe(CN)₆]⁴⁻ was studied, indicating that the Bulter−Volmer (B−V) theory is suitable for the consecutive electron transfer. Thus, TLCV is demonstrated to be a useful means for investigating the kinetics of heterogeneous consecutive ET.