Mn²⁺/Mn³⁺电对在不同电极上的电化学性能

来源期刊：有色金属2010年第3期

论文作者：薛方勤 王永亮 张鸿涛

文章页码：30 - 34

关键词：电极过程； Mn²⁺/Mn³⁺电对； 液流电池； 石墨电极； 炭毡电极； 旋转圆盘电极(RDE)

Key words：electrode process； Mn²⁺/Mn³⁺ couple； redox flow battery； graphite electrode； carbon felt electrode； rotating disc electrode

摘    要：采用循环伏安、交流阻抗和旋转圆盘电极方法,研究Mn²⁺/Mn³⁺电对在不同的电极材料上的电化学性能。结果表明,Mn³⁺在石墨电极上岐化反应较少发生,而在炭毡电极上由于存在较多的活性位点而岐化反应的倾向较大,在玻璃炭电极上进行的旋转圆盘电极试验证实了岐化反应的发生。同时确定了在石墨电极上合适的支持电解质硫酸的浓度,计算了Mn²⁺的扩散系数。

Abstract: The electrochemical performances of the Mn²⁺/Mn³⁺ couple on the different electrodes are investigated by using of the cyclic voltammetry,electrochemical impedance spectroscopy and rotating disc electrode processes.The results show that the disproportionation reaction hardly occurs on the graphite electrode,however,the disproportionation reaction prefers occuring on the felt electrode because there are many active sites on the electrode.The disproportionation reaction is also identified by the rotating disc electrode test with glass electrode.Moreover,suitable supporting electrolyte on the graphite electrode and diffusion coefficient of Mn²⁺ is determined.