Voltammetric and photoelectron spectral elucidation of the electrocatalytic oxidation of hydrogen peroxide at screen-printed carbon electrodes chemically modified with cobalt phthalocyanine
✍ Scribed by Markas A. T. Gilmartin; Richard J. Ewen; John P. Hart; Colin L. Honeybourne
- Publisher
- John Wiley and Sons
- Year
- 1995
- Tongue
- English
- Weight
- 947 KB
- Volume
- 7
- Category
- Article
- ISSN
- 1040-0397
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✦ Synopsis
The interplaying mechanisms involved in the electrocatalytic oxidation of hydrogen peroxide (H202) have been studied using cyclic and differential-pulse voltammetry and X-ray photoelectron spectroscopy (XPS). Cobalt phthalocyanine (CoPC) modified screen-printed carbon electrodes (SPCEs) were used as base transducers in the voltammetric studies, and for XPS experiments a mixture of the printing ink containing CoPC was coated onto a steel stub. These investigations have shown that CoPC is initially in the Co2+ oxidation state, and that in plain supporting electrolytes it is subsequently electrochemically oxidized to Co3+. A postulated sequence of events for the mediated oxidation of H202 at CoPC-SPCEs has been derived from the XPS and voltammetric data generated.