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Electrocatalytic Reduction of Dioxygen at Carbon Electrodes Modified with Co(II)‐Schiff Base Complexes in Various pH Solutions
Author(s) -
Choi YongKook,
Park JongKi,
Jeon Seoungwon
Publication year - 1999
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/(sici)1521-4109(199902)11:2<134::aid-elan134>3.0.co;2-7
Subject(s) - chronoamperometry , glassy carbon , chemistry , cyclic voltammetry , electrochemistry , inorganic chemistry , schiff base , electrode , electrocatalyst , reversible hydrogen electrode , standard hydrogen electrode , working electrode , polymer chemistry
The electrocatalytic reduction of dioxygen has been studied by cyclic voltammetry and chronoamperometry at a glassy carbon electrode and a carbon microelectrode modified with Schiff base Co(II) complex in a dioxygen saturated 1 M KOH aqueous solution of various pH and temperature. The electrochemical reduction of dioxygen at the modified electrode establishes a pathway of two‐electron reduction to form hydrogen peroxide. The reduction potential (E P ) of dioxygen shows pH dependence. The electrochemical reduction of dioxygen is irreversible and diffusion controlled. The activation energy obtained from Arrhenius plots for the reduction of dioxygen was 3.64 Kcal/mol at the bare glassy carbon electrode, whereas it was 2.51 Kcal/mol at the modified glassy carbon electrode.