钴电极在碱性溶液中氧化还原反应的现场共聚焦显微喇曼光谱研究

Studies on the Redox Reactions of Cobalt Electrodes in Alkaline Solution by Using In-situ Confocal Microprobe Raman Spectroscopy

采用现场共聚焦显微喇曼光谱研究钴电极在碱性溶液中的氧化还原行为和生成物的喇曼光谱特征 .研究结果表明 :电位正向扫描时 ,在 - 0 .6 4V左右 Co氧化生成 Co(OH) 2 和 Co O,随着电位正移逐步生成 Co3O4,在正电位区电极表面层主要是 Co3O4、 Co OOH和 Co O2 等 ;电位负向扫描时 ,电极表面上的高价含氧化合物相继还原为 Co3O4和 Co(OH) 2 ,并最终还原为 Co.由不同电位下的生成物的喇曼光谱可以看出 :电极表面上的氧化还原反应是随电位变化而逐步进行的连续化反应过程 ,并主要形成复合含氧化合物 .

The redox reaction processes and Raman spectra of reaction products of cobalt electrodes in 30% KOH+1% LiOH solution were studied by using \%in\|situ\% Confocal Microprobe Raman Spectroscopy. It is shown that the oxidation reaction at -0\^64 V can be ascribed to the formation of Co(OH)\-2 and CoO. Co\-3O\-4 was formed with increasing the potential, and Co\-3O\-4, CoOOH and CoO\-2 form composite oxides surface layer in positive potential region. In the course of potential sweeping from the positive to the negative, the higher valent oxides were reduced to Co\-3O\-4 and \{Co(OH)\-2\} successively, and they were reduced to Co finally. From the Raman spectra at different potentials of cobalt electrodes, it is proposed that the redox reactions are continuous processes with the changing of potentials, and the surface layer of cobalt electrode is composed of composite oxides. [WT5HZ]