高等学校化学学报

高等学校化学学报 ›› 1999, Vol. 20 ›› Issue (8): 1276.

• 论文 • 上一篇    下一篇

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

南俊民, 杨勇, 尤金跨, 林祖赓   

  1. 厦门大学固体表面物理化学国家重点实验室, 物理化学研究所, 化学系, 厦门 361005
  • 收稿日期:1998-08-31 出版日期:1999-08-24 发布日期:1999-08-24
  • 通讯作者: 林祖赓
  • 作者简介:南俊民,男,30岁,博士.
  • 基金资助:

    国家“863”计划(批准号:863-715-004-0070);国家自然科学基金(批准号:29673003)资助

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

NAN Jun-Min, YANG Yong, YOU Jin-Kua, LIN Zu-Geng   

  1. State Key Lab. for Physical Chemistry of Solid Surfaces, Institute of Physical Chemistry, Department of Chemistry, Xiamen University, Xiamen 361005, China
  • Received:1998-08-31 Online:1999-08-24 Published:1999-08-24

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被引次数

12

摘要： 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-0.64V左右Co氧化生成Co(OH)2和CoO,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、CoOOH和CoO2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.

关键词: 钴电极, 氧化还原反应, 现场共聚焦显微喇曼光谱

Abstract: The redox reaction processes and Raman spectra of reaction products of cobalt electrodes in 30% KOH+1% LiOHsolution were studied by using in-situ Confocal Microprobe Raman Spectroscopy. It is shown that the oxidation reaction at -0.64 Vcan be ascribed to the formation of Co(OH)2 and CoO. Co3O4 was formed with increasing the potential, and Co3O4, CoOOH and CoO2 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 Co3O4 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.

Key words: Cobalt electrode, Redox reaction, In-situ confocal microprobe Raman spectroscopy

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