Cathodic decomposition of propylene carbonate at graphite electrodes

T. Piao, C. Doh, S. Moon, Su-Moon Park
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Abstract

The decomposition reaction of propylene carbonate (PC) has been studied at graphite electrode in 1.0 M LiClO/sub 4/ employing a variety of transient electrochemical techniques. Results show that the PC decomposition reaction takes place through an EC' (electron transfer followed by catalytic reduction) reaction path. The pseudo first order rate constants of the chemical decomposition step has been determined. The formation of passive films on the electrode surface has been confirmed. The diffusion coefficients at the fresh and the film covered graphite electrodes have been determined to be 8.2/spl times/10/sup -9/ cm/sup 2//s and 7.1/spl times/10/sup -9/ cm/sup 2//s, respectively.
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碳酸丙烯在石墨电极上的阴极分解
采用多种瞬态电化学技术,在1.0 M LiClO/sub - 4/的石墨电极上研究了碳酸丙烯(PC)的分解反应。结果表明,PC分解反应是通过EC(电子转移+催化还原)反应途径进行的。确定了化学分解步骤的准一级速率常数。在电极表面形成了钝化膜。在新鲜石墨电极和薄膜覆盖石墨电极处的扩散系数分别为8.2/spl倍/10/sup -9/ cm/sup 2//s和7.1/spl倍/10/sup -9/ cm/sup 2//s。
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