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KMID : 1059519970410080385
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Journal of the Korean Chemical Society
1997 Volume.41 No. 8 p.385 ~ p.391
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Electrocatalytic Effect on the Oxygen Reduction and Electrochemical Properties of Co(Ⅱ)-dimethyl Bipyridine Perchlorate
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Kim Il-Kwang
Park Chong-Sool
Han Wan-Soo
Kim Youn-Keun
Jeon Il-Cheol
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Abstract
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Diffusion Coefficient(D0) and electrode reaction rate Constant(k0) of Co(dimethyl bipyridine)3(ClO4)2 were determined by cyclic voltammetry and chronoamperometry. It was also investigated that the effects of solvent, concentration, and scan rate, etc. on the diffusion coefficient and the temperature effect on the rate constant. The peak currents and diffusion coefficients were decreased as increasing the viscosity of solvent. Diffusion coefficient was 5.54 × 10-6 cm2/sec and the reaction rate constant was 2.39 × 10-3/s at 25 ℃. The thermodynamic parameters such as ΔG≠, ΔH≠, and ΔS were calculated from plotting the reaction rate constants versus the solution temperatures. This compound was shown the catalytic effect on the oxygen reduction that the reduction peak current of oxygen was greatly enhanced and the peak potential was shifted to +0.2 volt.
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