H2O2在具有纳米结构的Rh微电极上的电催化氧化

doi:10.61558/2993-074X.2616

摘要/Abstract

摘要： 在含有C₁₂EO₈(Octaethyleneglycol Monododecyl Ether)的H₁溶致液晶相中Pt微电极上电沉积Rh介孔膜. 该电极在中性、低浓度（CH₂O₂ <10 mmol•L-1）条件下，对H₂O₂有较好的氧化还原响应及稳定性. 由于电流磁滞效应，H₂O₂在Rh介孔膜微电极上的氧化与电位相关，且遵循与Rh(OH)₃有关的CEE（Chemical Reaction-Electron Transfer Reaction- Electron Transfer Reaction）反应机制. H₂O₂浓度较大时，孔电极表面其结合点位趋于饱和或在孔内溶液酸化的反应限制，电流可呈现一个平台. Rh介孔膜厚度小于200 nm的电极，H₂O₂浓度校正曲线符合膜孔反应一维扩散模型.

关键词: H₂O₂, Rh, 微电极, 纳米孔, 易溶液晶, 模板电沉积

Abstract: Mesoporous Rh films were deposited onto platinum microelectrodes from the H₁ lyotropic liquid crystalline phase of C₁₂EO₈ (octaethyleneglycol monododecyl ether). The electrodes show well defined voltammetry for the oxidation and the reduction of hydrogen peroxide at low concentrations (<10 mmol•L-1) with excellent stability for operation at neutral pH. Based on the hysteresis in the current and the potential dependence the oxidation of hydrogen peroxide occurs through a CEE mechanism involving Rh(OH)₃ on the mesoporous Rh electrode surface. At higher hydrogen peroxide concentrations the current reaches a plateau that is due to either saturation of the binding sites for hydrogen peroxide or limitation of the reaction due to acidification of the solution within the pores. For the thin films (below 200 nm) the hydrogen peroxide calibration curves we fitted to a one dimensional model for diffusion and reaction within the pores.

Key words: hydrogen peroxide, rhodium, microelectrode, nanoporous, lyotropic liquid crystal, templated electrodeposition

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O646

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Philip N. Bartlett, Thomas F. Esterle. H₂O₂在具有纳米结构的Rh微电极上的电催化氧化[J]. 电化学（中英文）, 2012, 18(5): 457-471.

Philip N. Bartlett, Thomas F. Esterle. The Oxidation of Hydrogen Peroxide on Nanostructured Rhodium Microelectrodes[J]. Journal of Electrochemistry, 2012, 18(5): 457-471.

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https://electrochem.xmu.edu.cn/CN/Y2012/V18/I5/457

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H₂O₂在具有纳米结构的Rh微电极上的电催化氧化

The Oxidation of Hydrogen Peroxide on Nanostructured Rhodium Microelectrodes

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