单缺位Dawson型磷钨杂多酸掺杂聚吡咯的过氧化氢传感器研究

Study of Hydrogen Peroxide Sensor Based on Doped Polypyrrole Film With Single Lacunary Dawson-type Tungstophosphate

在金电极上，用电化学方法将单缺位Ｄａｗｓｏｎ型磷钨杂多酸盐ａ２－Ｋ１０Ｐ２Ｗ１７Ｏ６１１５Ｈ２Ｏ的阴离子（Ｐ２Ｗ１７）掺杂到聚吡咯（ＰＰｙ）薄膜中，制成ＰＰｙ／Ｐ２Ｗ１７／Ａｕ的Ｈ２Ｏ２传感器。研究了它对 Ｈ２Ｏ２电还原过程的催化机理．其 ｉｐｅ与 ＣＨ２Ｏ２在 ６．０× １０－５～８． ８×１０－４ ｍｏｌ／Ｌ和８．８×１０－４～６．０×１０－３ｍｏｌ／Ｌ范围内呈良好的线性关系，检测下限为４．０×１０－５ｍｏｌ／Ｌ。用于模拟水样中Ｈ２Ｏ２的测定，结果较满意．

On An electrode, the anion of lacunary Dawson-type tungstophosphate (P2W17 ) was doped into polypyrrole (PPy) film by electrochemical method and the PPy/P2W17/Aubased hydrogen peroxide sensor was prepared. The catalytic mechanism towards the electroreduction process of H2O2 was discussed. The catalytic current is proportional to the concentration of H2O2 in the range of 6. 0 × 10-5 to 8. 8 × 10-4mol/L and 8. 8 × 10-4 to 6. O× 10-3 mol/L. The detection limit is 4. 0× 10-5 mol/L. The determination of H2O2 in simulated water samples got satisfactory results.