单缺位磷钨杂多酸聚吡咯修饰电极的制备及其电化学性能

Preparation of Single Lacunary Tungstophosphatepolypyrrole Film Modified Electrode and Its Electrochemical Property YANG Zhi and W

在玻碳电极（ＧＣ）上，用电化学方法将单缺位Ｄａｗｓｏｎ型磷钨杂多酸盐Ｋ１０Ｐ２Ｗ１７Ｏ６１·１５Ｈ２Ｏ的阴离子（Ｐ２Ｗ１７）掺杂到聚吡咯（ＰＰＹ）薄膜中制成的Ｐ２Ｗ１７／ＰＰＹ／ＧＣ化学修饰电极，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与灵敏度。研究表明，浓度为０．５ｍｏｌ／Ｌ的Ｈ２ＳＯ４溶液中，聚吡咯薄膜中Ｐ２Ｗ１７的第一个还原峰对ＮＯ－２的电还原具有很好的催化活性，其催化电流与ＮＯ－２浓度在６．０×１０－５～２．６×１０－２ｍｏｌ／Ｌ范围内呈良好的线性关系。

he anion of single lacunary Dawsontype tungstophosphate salt K10P2W17O6115H2O(P2W17) was doped into the polypyrrole (PPY) film on a glass carbon electrode (GC) by electrochemcal method to prepared the chemically modified electrode(P2W17/PPY/GC).It not only maintains the electrochemical activity and electrocatalytic property of P2W17,but also has good stability and sensitivity.In 0.50mol/L H2SO4 solution ,the first cathodic peak of P2W17 doping in polypyrrole film can catalyze well the electroreduction of nitrate.The catalytic current is proportional to the concentration of NO-2 in the range of 6.010-5to 2.610-2mol/L