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H2O2在具有纳米结构的Rh微电极上的电催化氧化

  • Philip N. Bartlett ,
  • Thomas F. Esterle
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  • 南安普顿大学化学系, 英国 南安普顿 SO17 1BJ 1Now at: Department d’Enginyeria Quimica, Universitat Rovira i Virgili, Avinguda Pa?sos Catalans 26, 43007 Tarragona, Spain

收稿日期: 2012-06-14

  修回日期: 2012-08-01

  网络出版日期: 2012-10-28

基金资助

This work was supported by the EPSRC Grant EP/E0473X/1

The Oxidation of Hydrogen Peroxide on Nanostructured Rhodium Microelectrodes

  • Philip N. Bartlett ,
  • Thomas F. Esterle
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  • Chemistry, University of Southampton, Southampton, SO17 1BJ, UK

Received date: 2012-06-14

  Revised date: 2012-08-01

  Online published: 2012-10-28

Supported by

This work was supported by the EPSRC Grant EP/E0473X/1

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.

本文引用格式

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, 2012 , 18(5) : 457 -471 . DOI: 10.61558/2993-074X.2616

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.

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