The electrochemical reduction of hydrogen peroxide on polycrystalline copper in borax buffer
ABSTRACT The electrochemical reduction of hydrogen peroxide on copper electrodes in a borax buffer has been studied. The effects of surface oxidation and chloride ions in the electrolyte have been investigated. Hydrogen peroxide can be electrochemically reduced on Cu(I) oxidized surfaces. In the absence of chloride, the reduction is catalysed by a redox cycle involving the Cu(I)/Cu(II) couple. In chloride-containing solutions, the surface oxides are dissolved and the reduction becomes more irreversible. There appears to be a change in the reduction mechanism at potentials more negative than −0.45 V.
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ABSTRACT: The aim of this study is to evaluate the electrochemical corrosion behaviour of Incoloy 800 in sulphate solutions containing H2O2 in the temperature range of 25–80 °C. The open circuit potential measurements, cathodic and anodic polarization and electrochemical impedance spectroscopy (EIS) were used to characterize the corrosion behaviour. The results provide kinetic data for reduction of hydrogen peroxide on Pt surface. The anodic polarization curves for Incoloy at different pH, temperature and H2O2 concentration are presented. EIS data generally confirm the polarization interpretations about the effects of various parameters. An equivalent circuit was used to fit all the acquired data.Research highlights► Kinetic data for electrochemical reduction of hydrogen peroxide is presented. ► Incoloy 800 polarization at various temperatures, pH and H2O2 concentration. ► EIS data generally confirms the polarization interpretations.Corrosion Science. 01/2010; 52(12):4035-4045.
- Journal of The Electrochemical Society - J ELECTROCHEM SOC. 01/2010; 157(1).
- Journal of The Electrochemical Society - J ELECTROCHEM SOC. 01/2010; 157(10).