高等学校化学学报

高等学校化学学报 ›› 2000, Vol. 21 ›› Issue (6): 865.

• 论文 • 上一篇    下一篇

基于溶胶-凝胶技术的磷钨杂多酸化学修饰电极的组装及其电催化

李丽东, 李文江, 孙长青   

  1. 吉林大学化学系, 长春 130023
  • 收稿日期:1999-08-10 出版日期:2000-06-24 发布日期:2000-06-24
  • 通讯作者: 孙长青(1944年出生),男,教授,主要从事电分析化学研究.

Fabrication of Chemically-modified Electrode Containing2∶18 Tungstophosphate Anions Based on Sol-gel Technique and Its Electrocatalysis

LI Li-Dong, LI Wen-Jiang, SUN Chang-Qing    

  1. Department of Chemistry, Jilin University, Changchun 130023, China
  • Received:1999-08-10 Online:2000-06-24 Published:2000-06-24

PDF (PC)

被引次数

100

摘要： 将Dawson型磷钨杂多酸盐K6P2W18O62·10H2O(P2W18)掺杂到溶胶-凝胶中,滴涂在碳糊电极表面,制备成化学修饰电极.并对该化学修饰电极的电化学行为,包括溶液pH值的影响和电极稳定性等进行了详细的研究.结果表明,此电极既保持了该杂多酸的电化学活性和电催化性能,又具有良好的稳定性和灵敏度.实验发现,在0.5mol/LH2SO4溶液中,掺杂在溶胶-凝胶膜中的P2W18的第3、第4个还原峰对NO2-离子具有很好的电催化活性,且催化电流同NO2-浓度呈线性关系.同时,P2W18的第3、第4个还原峰对分子氧也具有很好的电催化活性.

关键词: 溶胶-凝胶技术, P2W18, 电催化, 亚硝酸根, 分子氧

Abstract: The anions of Dawson-type tungstophosphate acid were modified on the surface of a carbon paste electrode by the sol-gel technique. The electrochemical behavior of the modified electrode was studied in detail, including pHdependence, stability and so on. Experimental results show that the modified electrode not only maintains the electrochemical activity and electrocatalytic properties of P2W18, but also has a good stability and sensibility. In 0.5 mol/L H2SO4 solution, the third and the fourth cathodic peaks of P2W18 doped in sol-gel film have a good catalytic effect on the reduction of nitrite. The catalytic current is proportional to NO2-concentration. At the same time, we found that the third and the fourth cathodic peaks of P2W18 doped in sol-gel film had an excellent effect on the reduction of dioxygen.

Key words: Sol-gel technique, 2∶18 Tungstophosphate acid, Electrocatalysis, Nitrite ions, Dioxygen

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