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应用循环伏安法及带环的旋转圆盘电极(RRDE)在2mol·dm~(-2)HCl溶液中研究了经热处理的四(对甲氧基苯基)卟啉钴(Co-TMPP)对胱氨酸还原反应的电催化作用.在循环伏安曲线上出现明显的氧化还原电流峰,表明Co-TMPP对胱氨酸还原有很好的电催化活性.在Co-TMPP/石墨电极上的还原反应为不可逆的简单电荷传递反应,其控制步骤的电子数为1.在极化电位较正时(-0.35～-0.45V)为电化学控制,在电位较负时(<-0.45V)为电化学及扩散混合控制.根据实验结果计算了动力学参数并初步讨论了反应机理.应用薄层盘环电极及聚四氟乙烯粘结膜电极分别测定了胱氨酸还原反应的电流效率.实验结果表明,经热处理的Co-TMPP能提高胱氨酸还原反应的电流效率.
The heat-treated cobalt (Co-TMPP) complexes of tetrakis (p-methoxyphenyl) porphyrin were studied by cyclic voltammetry and ring rotating disk electrode (RRDE) in 2mol · dm ~ The electrocatalytic activity of the cystine reduction reaction showed a significant redox current peak on the cyclic voltammetry curve, indicating that Co-TMPP has good electrocatalytic activity for cystine reduction.On the Co-TMPP / graphite electrode Of the reduction reaction is an irreversible simple charge transfer reaction, the control step of the number of electrons is 1. When the polarization potential is more positive (-0.35 ~ -0.45V) for electrochemical control, when the potential is more negative (<-0.45V ) For the electrochemical and diffusion mixing control.According to the experimental results, the kinetic parameters were calculated and the reaction mechanism was preliminarily discussed.The current efficiency of cystine reduction reaction was measured by using the thin-layer electrode and polytetrafluoroethylene The experimental results show that the heat-treated Co-TMPP can improve the current efficiency of the cystine reduction reaction.