中文摘要：

通过层层静电自组装法在基底上原位制备了钯取代Keggin型磷钨杂多酸／聚酰胺-胺多层膜修饰电极．利用x射线光电子能谱和扫描电子显微镜等手段对多层膜的组成和表面形貌进行了表征．结果表明，经杂多酸阴离子和聚酰胺-胺交替组装形成的多层膜生长均匀且表面平整．用循环伏安法研究了多层膜的形成过程及电化学性能．测试结果表明：多层膜在0．4～-0．6V电位范围内出现一对归属于Pd（Ⅱ）／Pd（I）的氧化还原峰，该峰随pH值和扫描速率的改变而发生一定程度的形变；在pH=4的缓冲溶液中，多层膜修饰电极的稳定性良好且对BrO3-和H2O2的还原反应表现出良好的催化活性．

英文摘要：

The multilayer films modified electrode consisting of palladium（II）-substituted Keggin type 12-tungstophosphates and G4 poly （amidoarnine） （PAMAM） dendrimer were fabricated on the electrode surface by layer-by-layer self-assembly technique. The obtained films were characterized by X-ray photoelectron spectroscopy （XPS） and scanning electron microscope （SEM）. It shows that the surface of multilayer films consisting of [PdPW11 O39 ]5- and PAMAM is homogeneous and uniform. Cyclic voltammetry analysis indicate that the redox peak assigned to Pd（II）/Pd（I） is deformed with the changes of pH values and scanning rates, and the multilayer composite films are stable and exhibit good catalytic activities for the reduction of BrO3- and H2 O2 in the NaAe-HAc buffer solution.