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KMID : 1059519930370040462
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Journal of the Korean Chemical Society
1993 Volume.37 No. 4 p.462 ~ p.469
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The Electrocatalytic Reduction of Dioxygen by Bis-Cobalt Phenylporphyrins in Alkaline Solution
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Choi Yong-Kook
Moon Hyun-Ju
Jeon Seung-Won
Chjo Ki-Hyung
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Abstract
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The electrocatalytic reduction of dioxygen is investigated by cyclic voltammetry and chronoamperometry at glassy carbon electrode and carbon microelectrode coated with a variety of cobalt phenylporphyrins. The n value obtained at carbon microelectrode is slightly different from that determined at glassy carbon electrode. Dioxygen reduction catalyzed by the monormeric porphyrin Co(Ⅱ)-TPP mainly occurs through the 2e- reduction pathway resulting in the formation of hydrogen peroxide, electrocatalytic process carries out 4e- reduction pathway of dioxygen to H2O at the electrodes coated with bis-cobalt phenylporphyrins. The electrocatalytic reduction of dioxygen is irreversible and diffusion controlled.
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