中文摘要：

选用水溶性高分子聚乙烯亚胺（PEI）修饰石墨烯（GN），增强石墨烯的水溶性和分散性；利用层层自组装法制备{PEI-GN/PW12}n 复合膜，并以此为基底膜，用循环伏安法原位电沉积制备 Pt 纳米簇负载的复合膜催化剂。紫外可见分光光度法（UV-Vis）、X射线衍射（XRD）、X 射线光电子能谱（XPS）和扫描电子显微镜（SEM）等技术表征复合膜催化剂组成、形貌和结构。循环伏安法（CV）、计时电流法（It）、CO 溶出伏安法及电化学阻抗等电化学方法研究结果表明，该纳米复合膜催化剂对甲醇氧化具有良好的电催化活性、稳定性及抗 CO 毒化能力。

英文摘要：

Graphene （GN）was functionalized by the water-soluble polymer polyethyleneimine （PEI）to enhance its solubility and dispersity.The {PEI-GN/PW1 2 }n composite films composed of functionalized graphene （PEI-GN）and phosphotungstic acid （H 3 PW1 2 O 40 ,PW1 2 for short）were prepared by LBL electrostatic assembly technique,and then it was used as a substrate for electro-deposition Pt nanoparticles cluster in-situ by cyclic voltammetry.The fabricated composite films were characterized by ultraviolet-visible spectrophotometry （UV-Vis）,X-ray diffraction （XRD）,X-ray photoelectron spectroscopy （XPS）and scanning electron microscope （SEM）.Cyclic voltammetry （CV）,chronoamperometry （It）,CO stripping voltammetry and electrochemical impedance spectra （EIS）analysis show that the Pt/{PEI-GN/PW1 2 }n has superior eletro-catalytic activity,sta-bility and ability to resist CO poisoning regarding methanol oxidation.