The Oxidation of Hydrogen Peroxide on Nanostructured Rhodium Microelectrodes

Authors

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

Corresponding Author

N. Bartlett Philip(pnb@soton.ac.uk)

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.

Graphical Abstract

Keywords

hydrogen peroxide, rhodium, microelectrode, nanoporous, lyotropic liquid crystal, templated electrodeposition

DOI Link

https://doi.org/10.61558/2993-074X.2616

Publication Date

2012-10-28

Online Available Date

2012-08-15

Revised Date

2012-08-01

Received Date

2012-06-14

Recommended Citation

N. Bartlett Philip, F. Esterle Thomas. The Oxidation of Hydrogen Peroxide on Nanostructured Rhodium Microelectrodes[J]. Journal of Electrochemistry, 2012 , 18(5): Article 8.
DOI: 10.61558/2993-074X.2616
Available at: https://jelectrochem.xmu.edu.cn/journal/vol18/iss5/8

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