化学学报 ›› 2009, Vol. 67 ›› Issue (15): 1743-1748. 上一篇    下一篇

研究论文

ZnO-Bi2O3二元陶瓷粉体电化学行为研究

王艳珍a,b 钟庆东*,c 巫欣欣d 施利毅a

  

  1. (a上海大学纳米科学与技术研究中心 上海 200444)
    (b上海大学环境与化学工程学院 上海 200072)
    (c上海市现代冶金与材料制备重点实验室 上海 200072)
    (d上海大学理学院 上海 200444)

  • 收稿日期:2008-12-15 修回日期:2009-02-06 出版日期:2009-08-14 发布日期:2009-08-14
  • 通讯作者: 钟庆东

The Electrochemical Behavior of ZnO-Bi2O3 Ceramic Powders

Wang, Yanzhen a,b Zhong, Qingdong *,c Wu, Xinxin d Shi, Liyi a   

  1. (a Research Center of Nano Science and Technology, Shanghai University, Shanghai 200444)
    (b School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200072)
    (c Key Laboratory of State Power Corporation of China, Department of Environmental Engineering,
    Shanghai University, Shanghai 200072)
    (d College of Science, Shanghai University, Shanghai 200444)
  • Received:2008-12-15 Revised:2009-02-06 Online:2009-08-14 Published:2009-08-14
  • Contact: Zhong, Qingdong

采用电化学阻抗谱和电位-电容测试及Mott-Schottky分析技术研究了ZnO-Bi2O3粉体电极在0.5 mol/L NaCl溶液中的电化学行为. 研究表明, ZnO-Bi2O3粉体表现为n型半导体; 随着Bi2O3含量的增加或混合时间的延长, 粉体的阻抗增大, 空间电荷层电容Csc减小, 载流子浓度ND减小; 经高温烧结成二元压敏陶瓷, 随着混合时间的延长, 电阻片综合电性能越好. 该方法可有效评价二元陶瓷粉体混合均匀性.

关键词: 电化学阻抗谱, 电位-电容法, Mott-Schottky分析, 载流子浓度

The electrochemical behavior of ZnO-Bi2O3 powder electrode immersed in 0.5 mol/L NaCl solution were investigated by the electrochemical impedance spectroscopy and potential-capacitance methods combining with Mott-Schottky analysis. The result showed that the powder electrodes showed n-type semiconductor. With increasing of the Bi2O3 content in the ZnO powder and prolongation of mixing time, the electrochemical impedance spectrum (EIS) impedance of the electrodes increased gradually, the Csc of the powder electrode decreased gradually, and the charge carrier density decreased. After sintering at high temperature, also prolongation of mixing time, the binary ZnO-Bi2O3 ceramics showed better electric characteristics. It was suggested that this could be an effective method for evaluating the homogeneity for blending of binary ceramics.

Key words: electrochemical impedance spectroscopy, potential-capacitance method, Mott-Schottky analysis, charge carrier density