[SiMn(H2O)W11O39]6^-在玻碳电极上的多层组装膜修饰电极及电化学行为

Multilayer Assembly and Electrochemical Behavior of [SiMn(H_2O)W_(11)O_(39)]^(6-) on Glassy Carbon Electrode

采用电化学生长法制备包含杂多酸[SiMn(H2O)W11O39]6-(SiMnW11)和聚合物阳离子PDDA的多层膜修饰电极,利用循环伏安法研究其电化学行为、扫描速率的影响及其对BrO3-和NO2-体系还原的电催化性能。结果表明:SiMnW11多层膜增长均匀,峰电流随层数的增加而增加;多层膜的峰电流随扫速的增加而增加;SiMnW11修饰电极对BrO3-和NO2-的还原具有良好的电催化作用。在最佳的实验条件下,BrO3-的还原峰电流与其浓度在0.345~5.28 mmol.L-1范围内呈良好的线性关系,相关系数r=0.998,检出限8.8×10-5mol.L-1。

A novel chemically-modified electrode was constructed by muhilayer films composed of het- eropolyanion（ SiNiW11） and cationic polymer poly（ diallyldimethylammonium chloride） through electrochemical growth. The electrochemical behavior of this modified electrode and its electrocatalytic response to the reduction of BrO^-3 and NO^-2 were investigated by cyclic vohammetry. The experimental results showed that the films grew uniformly. The peak currents increased with the increasing of layers as well as the scan rate. Under the optimum conditions, the linear range for BrO3 detection was found to be 0.345 -5.28 mmol·L^-1 with the detection limit of 8.8×10^-5 mol·L^-1, with a linear range of 3.45×10^-4-5.28×10^-3mol·L^-1.