VOLTAMMETRIC AND PHOTOELECTRON SPECTRAL ELUCIDATION OF THE ELECTROCATALYTIC OXIDATION OF HYDROGEN-PEROXIDE AT SCREEN-PRINTED CARBON ELECTRODES CHEMICALLY-MODIFIED WITH COBALT PHTHALOCYANINE
Mat. Gilmartin et al., VOLTAMMETRIC AND PHOTOELECTRON SPECTRAL ELUCIDATION OF THE ELECTROCATALYTIC OXIDATION OF HYDROGEN-PEROXIDE AT SCREEN-PRINTED CARBON ELECTRODES CHEMICALLY-MODIFIED WITH COBALT PHTHALOCYANINE, Electroanalysis, 7(6), 1995, pp. 547-555
The interplaying mechanisms involved in the electrocatalytic oxidation
of hydrogen peroxide (H2O2) have been studied using cyclic and differ
ential-pulse voltammetry and X-ray photoelectron spectroscopy (XPS). C
obalt 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 i
s 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 H2O2 at Co
PC-SPCEs has been derived from the XPS and voltammetric data generated
.