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 language | English |
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Pages (from-to) | 2015-2024 |
Number of pages | 10 |
Journal | Electrochimica Acta |
Volume | 43 |
Issue number | 14-15 |
DOIs | |
Publication status | Published - May 7 1998 |
Keywords
- Hydrogen peroxide
- Mechanism
- Oxidation
- Platinum
- Rotating disc electrode
ASJC Scopus subject areas
- Chemical Engineering(all)
- Electrochemistry