物理化学学报 >> 2006, Vol. 22 >> Issue (06): 716-720.doi: 10.3866/PKU.WHXB20060614

研究论文 上一篇    下一篇

氧在Ni-MnO2电极上的电催化还原

赵峰鸣;马淳安;褚有群;徐颖华   

  1. 浙江工业大学纳米科学与技术工程研究中心, 绿色化学合成技术国家重点实验室培育基地, 杭州 310032
  • 收稿日期:2005-11-01 修回日期:2006-02-24 发布日期:2006-05-31
  • 通讯作者: 马淳安 E-mail:Science@zjut.edu.cn

Oxygen Reduction on Ni-MnO2 Electrode in Alkaline Solution

ZHAO Feng-Ming;MA Chun-An;CHU You-Qun;XU Ying-Hua   

  1. Research Center of Nano Science and Technology, Key Laboratory of Green Chemistry Synthesis Technology, Zhejiang University of Technology, Hangzhou 310032, P. R. China
  • Received:2005-11-01 Revised:2006-02-24 Published:2006-05-31
  • Contact: MA Chun-An E-mail:Science@zjut.edu.cn

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摘要： 采用喷雾热解法合成了超细二氧化锰, 通过喷涂制作成Ni-MnO2薄膜电极, 结合SEM、AFM和电化学测试技术, 研究了碱性介质中氧在Ni-MnO2薄膜电极上的电催化还原过程. 发现二氧化锰颗粒呈片状, 是由球形前驱体烧结后碎裂而成; 通过快速循环伏安法检测到了MnO2电极上存在着中间态粒子的还原过程, 该粒子浓度可累积, 并逐渐消耗直至消失, 寿命可持续约200周循环; 结果表明, 该粒子对氧的还原具有特殊的电催化活性.

关键词: 喷雾热解法, Ni-MnO2薄膜电极, 氧还原反应

Abstract: Manganese dioxide was synthesized by a spray pyrolysis method and Ni-MnO2 film-type electrode was prepared by a spray-coating approach as well. SEM and AFM in combination with electrochemical measures were employed to characterize the microstructure, electrocatalytic properties, and the correlation between electroreduction of oxygen and electrocatalysis of the Ni-MnO2 electrode. A reductive process of intermediate particle was discovered by fast cyclic voltammograms. The concentration of the intermediate particle could be cumulated and its life could be up to about 200 cycles. The reduction of the intermediate particle was the main reason of highly electrocatalytical activity for oxygen reduction reaction.

Key words: Spray pyrolysis, Ni-MnO2 film-type electrode, Oxygen reduction reaction