三维结构氧化石墨烯载铂催化剂对甲醇电催化性能

Performance of the platinum nanoparticles supported on three-dimensional graphene as electro-catalyst for methanol electro-oxidation

喷雾干燥法制备具有三维结构的氧化石墨烯(PGO),在其表面进一步负载活性成分Pt,得到纳米Pt/PGO复合催化剂。采用X射线粉末衍射(XRD)、透视电镜(TEM)和扫描电镜(SEM)等对催化剂的形貌和结构进行表征。结果表明,PGO具有类似于长4-6μm和宽2.0-3.0μm的三维纸团结构,平均粒径为4.2 nm的Pt纳米粒子均匀分布在其表面。采用循环伏安和计时电流法研究了在酸性溶液中催化剂对甲醇的电催化氧化性能。结果表明,Pt/PGO催化剂对甲醇呈现出更高的电催化氧化活性和稳定性。PGO所具有的三维结构和双功能作用机理有利于甲醇在铂表面的电催化氧化过程的发生。

Three-dimensional graphene（ PGO） was synthesized by spay-drying method. Pt/PGO catalyst was prepared through the improved liquid phase reduction method. The samples were characterized by XRD,BET and TEM. The results indicated that PGO was a three-dimensional crumpled structure material with 4-6 μm in length and 2.0-3. 0 μm in width and the Pt nanoparticles with 4. 2 nm were highly dispersed on the surface of PGO. The electro-catalytic activity and stability of the catalysts tow ards methanol electro-oxidation were investigated using cyclic voltammetry and chronoamperometry. The as-prepared Pt/PGO catalyst exhibits higher electro-catalytic activity and good stability during methanol electro-oxidation in comparison to Pt/GO catalysts.The enhanced catalytic performance is attributed to the high specific surface area of the 3D formation and utilization efficiency of Pt during methanol electro-oxidation.