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- 2 浓度呈线性关系 The Keggin-type heteropoly silicic acid Si O2 · 1 2 WO3 · 2 6H2 O (Si W12) was doped into the sol-gel and applied onto the surface of the carbon paste electrode to prepare a chemically modified electrode Electrochemical performance studies show that the electrode not only maintains the electrochemical activity and the electrocatalytic property of the heteropolyacid, but also has good stability and sensitivity.In the 0.5 mol / LH 2 SO 4 solution, The first and second reduction peaks of Si W12 in the film have good electrocatalytic activity for NO 2 ion and molecular oxygen, and the catalytic current has a linear relationship with NO 2 concentration