Electrochemical oxidation of hydrogen peroxide at platinum electrodes. Part II: Effect of potential

Simon B. Hall, Emad A. Khudaish, Alan L. Hart

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Abstract

The electrochemical oxidation of H2O2 at a platinum rotating disc electrode was studied at pH 7.26 for the [H2O2] range 0-70 mM, rotation rates 630-10000 rpm and anodic potential +264 to +712 mV vs Ag/AgCl using staircase potentiometry. A mechanism is proposed to account for the steady-state current as a function of rotation rate, [H2O2] and anodic potential. This mechanism involves reversible binding of H2O2 to electrochemically generated Pt(II) surface sites, reduction of the site and inhibiting competitive adsorption of H+ and O2. Potential-invariant values of the constants for H2O2, H+ and O2 binding are determined and the rate constants for the reduction and the re-oxidation of the binding site as a function of potential are evaluated.

Original languageEnglish
Pages (from-to)2015-2024
Number of pages10
JournalElectrochimica Acta
Volume43
Issue number14-15
Publication statusPublished - May 7 1998
Externally publishedYes

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Keywords

  • Hydrogen peroxide
  • Mechanism
  • Oxidation
  • Platinum
  • Rotating disc electrode

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Analytical Chemistry
  • Electrochemistry

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