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将 Dawson型磷钨杂多酸盐 K6 P2 W1 8O6 2 · 1 0 H2 O( P2 W1 8)掺杂到溶胶 -凝胶中 ,滴涂在碳糊电极表面 ,制备成化学修饰电极 .并对该化学修饰电极的电化学行为 ,包括溶液 p H值的影响和电极稳定性等进行了详细的研究 .结果表明 ,此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和灵敏度 .实验发现 ,在 0 .5mol/L H2 SO4溶液中 ,掺杂在溶胶 -凝胶膜中的 P2 W1 8的第 3、第 4个还原峰对 NO- 2 离子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 .同时 ,P2 W1 8的第 3、第 4个还原峰对分子氧也具有很好的电催化活性 .
Dawson-type heteropolyphosphoric acid salt K6 P2 W1 8O6 2 · 1 0 H 2 O (P2 W1 8) was doped into a sol-gel and applied onto the surface of a carbon paste electrode to prepare a chemically modified electrode. The electrochemical behavior of the chemically modified electrode, including the effect of the solution p H value and the stability of the electrode, has been studied in detail.The results show that the electrode not only maintains the electrochemical activity and the electrocatalytic property of the heteropoly acid, but also has good The stability and the sensitivity of the experiment were investigated.It was found that the third and the fourth reduction peaks of P2 W1 8 doped in the sol-gel film were very good for NO 2 ions in 0.5 mol / L H2 SO4 solution , And the catalytic current has a linear relationship with the concentration of NO 2, meanwhile, the third and the fourth reduction peaks of P2 W1 8 also have good electrocatalytic activity for molecular oxygen.