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KMID : 1059519930370080735
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Journal of the Korean Chemical Society
1993 Volume.37 No. 8 p.735 ~ p.743
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The Electrocatalytic Reduction of Oxygen by Bis-Cobalt Phenylporphyrins in Various pH Solutions
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Choi Yong-Kook
Chjo Ki-Hyung
Park Jong-Ki
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Abstract
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The electrocatalytic reduction of oxygen is investigated by cyclic voltammetry and chronoamperometry at glassy carbon electrode and carbon microelectrode coated with a variety of cobalt phenylprophyrins in various pH solutions. Oxygen reduction catalyzed by the monomeric porphyrin Co(Ⅱ)-TPP mainly occurs through the 2e- reduction pathway resulting in the formation of hydrogen peroxide whereas electrocatalytic process carried out 4e- reduction pathway of oxygen to H2O at the electrodes coated with cofacial bis-cobalt phenylporphyrins in acidic solution. The electrocatalytic reduction of oxygen is irreversible and diffusion controlled. The reduction potentials of oxygen in various pH solutions have a straight line from pH 4 to pH 13, but level off in strong acidic solution. The reduction potentials of oxygen shift to positive potential more 400 mV at the electrode coated with monomer Co-TPP compound than bare glassy carbon electrode while 750 mV at the electrode coated with dimer Co-TPP compound.
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