Pt/{PEI-GN/PW_(12)}_n复合膜的制备及其对甲醇氧化的电催化性能

Preparation of Pt/{PEI-GN/PW_(12)}_n composite films and their electrocatalytic activity regarding methanol oxidation

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。

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.