Pt/{GN/CuPW_(11)}_n复合膜的制备及其对甲醇氧化电催化性能

Preparation and Electrocatalytic Property of Pt/{GN/Cu PW_(11)}_n Composite Films toward Methanol Oxidation

利用层接层自组装法(Layer-by-Layer assembly,LBL)制备过渡金属取代多金属氧酸盐Cu PW_(11)与石墨烯的复合膜{GN/Cu PW_(11)}_n,再通过恒电位法将Pt纳米粒子电沉积到复合膜上得到Pt/{GN/Cu PW_(11)}_n复合膜催化剂。用AFM、SEM、XRD和XPS对Pt/{GN/Cu PW_(11)}_4复合多层膜的组分和表面形貌进行了表征,结果表明:载体多层膜{GN/Cu PW_(11)}_4表面较为平整均匀,在选定恒电位下沉积在载体表面的Pt纳米粒子呈现花簇状且分布均匀。Pt/{GN/Cu PW_(11)}_4复合多层膜中Pt主要以Pt(0)形式存在,还含有少量Pt(Ⅱ)和Pt(Ⅳ)。电催化实验研究结果显示:引入Cu PW_(11)有效增强了Pt/GN复合膜催化剂的催化活性、电化学稳定性和抗CO毒化性能。

Composite films consisting of graphene and Cu PW（11） polyoxometalates {GN/Cu PW（11）}n, were prepared by layer-by-layer（LBL） assembly and used as a support for electro-deposition of Pt nanoparticles by cyclic voltammetry. The component and surface morphology of the multilayer composite films were characterized by AFM, SEM, XRD and XPS. The results indicate that {GN/Cu PW（11）}4 composite multilayer films exhibit even and uniform distribution and Pt nanoparticles on the surface of {GN/Cu PW（11）}4 composite multilayer films display flower-like cluster shape. Pt in the Pt/{GN/Cu PW（11）}4 composite multilayer films mainly exists in the form of Pt（0） but some exists in the form of Pt（Ⅱ） and Pt（Ⅳ）. The electrocatalysis experiment results show that introduction of Cu PW（11） evidently improves electrocatalytic activity, stability and CO tolerance ability of Pt/graphene composite catalysts toward methanol oxidation.