A Study of the Electrchemical Characteristics of the Co(salen)-Nafion Modificd Electrode

Abstract

Abstract: A Co(salen)-Nafion modified electrode was prepared by immersing a glassy carbon electrode coated with the Nafion film into the aqueous solution with saturatedCo(salen).The modified electrode showed a stable electrochemical reaction of Co(salen) atabout O V(vs.SCE).The result of XPSindicated the valence of cobalt in Co(salen) changesfrom +2 before to +3 after Co(salen) enters the Nafion film- It is due to forming axis coordination of cobalt with sulfonic group in Nafion film.It was found that the mode of electrontransfer in Co(salen)-Nafion modifled electrode was controlled by physical diffusion and electron hopping, It was also found that the modified electrode could catalyze the reduction of O₂to H₂O₂. The real catalyst may be the adduct of Co^Ⅱ(salen) and O₂.

Key words: Modified electrode, [Co(salen)], Electrocatalysis, Nafion film

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ZHENG Dong-Hong, ZHENG Jun-Wei, LU Tian-Hong. A Study of the Electrchemical Characteristics of the Co(salen)-Nafion Modificd Electrode[J]. Chem. J. Chinese Universities, 1997, 18(3): 360.

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A Study of the Electrchemical Characteristics of the Co(salen)-Nafion Modificd Electrode

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