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Voltammetric and photoelectron spectral elucidation of the electrocatalytic oxidation of hydrogen peroxide at screen‐printed carbon electrodes chemically modified with cobalt phthalocyanine
Author(s) -
Gilmartin Markas A. T.,
Ewen Richard J.,
Hart John P.,
Honeybourne Colin L.
Publication year - 1995
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140070608
Subject(s) - x ray photoelectron spectroscopy , hydrogen peroxide , cobalt , phthalocyanine , cyclic voltammetry , chemistry , inorganic chemistry , differential pulse voltammetry , electrode , electrochemistry , organic chemistry , chemical engineering , engineering
The interplaying mechanisms involved in the electrocatalytic oxidation of hydrogen peroxide (H 2 O 2 ) 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 Co 2+ oxidation state, and that in plain supporting electrolytes it is subsequently electrochemically oxidized to Co 3+ . A postulated sequence of events for the mediated oxidation of H 2 O 2 at CoPC‐SPCEs has been derived from the XPS and voltammetric data generated.