双-Keggin型四元杂多化合物[Nd(SiMo_7W_4O_(39))_2]^(13-)多层膜在化学修饰玻碳电极上的组装及电催化

Multilayer Assembly of Bis-Keggin-type Heteropoly Compound on Chemically Modified Glassy Carbon Electrode and Its Electrocatalysis

报道双－Ｋｅｇｇｉｎ型四元杂多化合物Ｋ１０Ｈ３［Ｎｄ（ＳｉＭｏ７Ｗ４Ｏ３９）２］ＸＨ２Ｏ（简称［Ｎｄ（ＳｉＭｏ７Ｗ４）２］１３－）聚合物的交替组装多层膜在４－氨基苯甲酸修饰玻碳电极上的制备及其电化学特性。各层的循环伏安行为证明膜的均匀增长，峰电流随层数的增加而增加。与溶液中的电化学行为相比，位于多层膜中的杂多化合物的氧化还原特征峰随着多层膜层数的增加，具有一定程度的形变。该电极具有较高的稳定性。并讨论了ｐＨ对其氧化还原行为的影响，考察了该多层膜修饰电极对ＢｒＯ３－、ＨＮＯ２和Ｈ２Ｏ２等的电催化性能。

Through layer-by-layer assembly, the bis-Keggin-type heteropolyanion K10H3 [Nd(SiMo7W4O39)(2)] XH2O was successfully immobilized on a glassy carbon electrode surface grafted covalently by 4-aminobenzoic acid. The electrochemical behavior of the heteropolyanion was investigated. Cyclic voltammetry proved the uniform growth of the film. However, the characteristic redox peaks of the heteropolyanion in the film were deformed with increasing of the number of the multilayer film. The effect of pH on the redox behaviors of [Nd(SiMo7W4)(2)](13-) in the film was discussed. The multilayer film electrodes have excellent electrocatalytic activities to the reduction of BrO3-, HNO2 and H2O2.