[SiCo（H2O）W11O39]6-在玻碳电极上的多层膜修饰及电化学行为

制备了包含杂多酸SiCo(H2O)W11O39]6-(SiCoW11)和阳离子聚电解质--聚二烯丙基二甲基氯化铵(PDDA)的多层膜修饰电极,用循环伏安法研究了SiCoW11在酸性水溶液中的电化学行为及pH的影响,初探了反应机理.逐层的循环伏安行为表明膜的增长均匀,峰电流随膜层数的增加而增加,与其在溶液中的氧化还原行为相比,多层膜中的SiCoW11对BrO-3和NO-2体系的还原具有良好的电催化性能.

Multilayer Assembly and Electrochemical Behavior of [SiCo(H2O)W11O39]6- on Glassy Carbon Electrodes

The electrochemical behavior of SiCo(H_2O)W_(11)O_(39)]~(6-) (SiCoW_(11)) heteropolyanion in acidic aqueous solutions is studied. The effect of solution pH on the electrochemical behavior of SiCoW_(11) is discussed and the mechanism concluded. New multilayer films composed of heteropolyanion (SiCoW_(11)) and cationic polymer poly (diallyldimethylammonium chloride) were fabricated. The electrochemical behaviors were investigated. Cyclic voltammetry proves uniform growth of the films. They exhibit some special electrochemical properties in the films, different from those in homogeneous aqueous solutions. The effect of pH on the redox behavior of SiCoW_(11) in the films is discussed in details. The multilayer film electrodes have an excellent electrocatalytic response to the reduction of BrO~-_3 and NO~-_2.