镧取代Dawson型磷钨杂多酸聚吡咯修饰电极的制备及其电化学性能

通过缺位填充法合成了分子式为α２－Ｋ７Ｐ２Ｗ１７Ｏ６１（Ｌａ· ＯＨ２）的镧（Ⅲ）取代十八钨磷酸盐。在玻碳电极（ＧＣ）上，用电化学方法将单取代Ｄａｗｓｏｎ型杂多酸盐α２－Ｋ７Ｐ２Ｗ１７Ｏ６１（Ｌａ·ＯＨ２）的阴离子（Ｐ２Ｗ１７Ｌａ）掺杂到聚吡咯（ＰＰＹ）薄膜中制成Ｐ２Ｗ１７Ｌａ／ＰＰＹ／ＧＣ化学修饰电极，既保持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。研究表明， ０． ５０ ｍｏｌ／Ｌ ＨＣＩ溶液中，聚吡咯薄膜中 Ｐ２Ｗ１７Ｌａ的第一对氧化还原峰对 ＮＯ２的电还原具有良好的催化活性，其催化电流与 ＮＯ２浓度在 ６．０ × １０－５－ １．０ × １０－２ｍｏｌ／Ｌ范围内呈线性关系。

Preparation of Lanthanum*# Substituted PropertyHeptadecatungstodiphosphate- Polypyrrole Film Modified Electrode and Its Electr

The heptadecatungstodiphosphate substituted by L a(Ⅲ) with the formula　α2-K7P2W17O61(La.OH2 ) (P2W 17La) was prepared by vacant refilling method. The anion of single substitu ted Dawson-type tungstophosphate salt was doped into the polypyrrole (PPY) film on a glassy carbon electrode (GC) by electrochemical method to prepare the chem ically modified electrode (P2W17La/PPY/GC). It maintains not only t he electrochemical activity and electrocatalytic property of P2W17L a, but also has good stability and sensitivity. In 0.50 mol/L HCl solution, th e first cathodic peak of P2W17La doping in polypyrrole film can cat alyze well the electroreduction of nitrite. The catalytic current was proporti onal to the concentration of nitrite between 6.0×10-5 and 1.0×10-2 　mol/L.