基于溶胶-凝胶技术的硅钨杂多酸化学修饰电极的组装及其电化学催化  

Fabrication of Chemically-modified Electrode Containing 1∶12 Silicotungstic Anions by Sol-gel Technique and Its Electrocatalytic Properties

作　　者：李丽东[1] 孙长青[1] 刘志红[2] 

机构地区：[1]吉林大学化学系,长春130023 [2]长春医学高等专科学校,长春130031

出　　处：《吉林大学自然科学学报》2000年第2期82-86,共5页Acta Scientiarum Naturalium Universitatis Jilinensis

摘　　要：将 Keggin型硅钨杂多酸 Si O2 · 1 2 WO3· 2 6H2 O(Si W12 )掺杂到溶胶 -凝胶中 ,滴涂在碳糊电极表面上 ,制备成化学修饰电极 .对该电极的电化学性能研究表明 ,该电极不但保持了杂多酸的电化学活性和电催化性能 ,而且具有良好的稳定性和灵敏度 .在 0 .5 mol/ LH2 SO4 溶液中 ,掺杂在溶胶 -凝胶膜中 Si W12 的第一和第二个还原峰对 NO- 2 离子和分子氧具有很好的电催化活性 ,且催化电流同 NO- 2The anions of a Keggin type silicotungstic acid were immobilized on the surface of a cabon paste electrode by the sol gel technique. The electrochemical behavior of the modified electrode was studied in detail. Experimental results show that the modified electrode not only maintains the electrochemical activity and electrocatalytic properties of SiW 12 , but also has good stability and sensibility. In a 0.5 mol/L H 2SO 4 solution, the first and the second cathodic peaks of SiW 12 doped in sol gel film can catalyze the electro reduction of nitrite. The catalytic current was proportional to NO - 2 concentration and it also exhibited good catalytic effect on the reduction of dioxyge.

关 键 词：硅钨酸 化学修饰电极 电催化 硅钨杂多酸 组装 

分 类 号：O657.1[理学—分析化学] O646.5[理学—化学]