【摘要】 以天然鳞片石墨为基材,采用高氯酸插层氧化制备了膨胀石墨(EG),利用乙二醇液相还原法在其表面负载了Pt纳米颗粒;采用XRD、TEM、SEM及循环伏安曲线(CV)等手段对其形貌、结构及对甲醇的电催化性能进行了表征研究。结果表明,Pt纳米颗粒的平均粒径为2.56 nm,均匀地分布在膨胀石墨载体表面,而片状结构的膨胀石墨载体能明显提升其电催化活性和抗CO中毒性能;相同条件下,该膨胀石墨负载纳米Pt催化剂的质量活性比和电流密度分别是商用JM Pt/C的1.24倍和1.5倍。更多还原

【Abstract】 Expanded graphite(EG) was prepared by intercalation oxidation of natural flake graphite with perchloric acid and Pt nanoparticles were then loaded on the surface of EG by means of liquid phase reduction method with ethylene glycol. The electrocatalytic performance of EG-supported Pt nanoparticle(Pt/EG) catalyst in the direct methanol fuel cell was investigated with the help of XRD, TEM, SEM and cyclic voltammetry(CV) characterizations. The results show that the Pt nanoparticles with average diameter of 2.56 nm are well dispersed on the surface of EG. The structure of expanded graphite sheets can obviously improve the electrocatalystic activity and tolerance to CO poisoning ability during methanol oxidation. Under the same conditions, the mass specific activity and the current density of current Pt/EG catalyst are 1.24 times and 1.5 times that of the commercial JM Pt/C, respectively.更多还原