低铂Pt/FePO_4/C催化剂在PEMFC中的应用

Low-platinum/iron phosphate/carbon catalyst in PEMFC

采用乙二醇还原法制备了Pt含量为5%(质量分数)的Pt/C和Pt/FePO4/C催化剂,并用透射电镜(TEM)表征催化剂的形貌。催化剂中Pt粒子在载体上高度分散,且粒径均匀。Pt/FePO4/C和Pt/C催化剂的平均粒径分别为1.2nm和0.9nm。实验结果表明,Pt/FePO4/C催化剂具有较Pt/C更高的电化学活性比表面积和催化氧还原的活性。分别利用两种催化剂制备PEMFC阴极,Pt的担量均为0.08mg/cm2。以氧气为阴极反应气时,采用Pt/FePO4/C和Pt/C的PEMFC单电池的峰值功率密度分别为763mW/cm2和663mW/cm2;阴极催化剂质量比功率分别为9.54kW/gPt和8.29kW/gPt;即作为PEMFC阴极催化剂,Pt/FePO4/C具有更高的催化活性。

Pt/C and Pt/FePO4/C catalysts（5% Pt） were prepared by ethylene glycol method.The physical properties of the catalysts were characterized by TEM.The results show that the catalyst particles are uniformly distributed on the support with an average particle size of 1.2 nm for Pt/FePO4/C and 0.9 nm for Pt/C,respectively.The electrochemical active surface area（EAS） and the catalytic activity towards oxygen reduction reaction（ORR） of Pt/FePO4/C catalyst are higher than Pt/C catalyst.The catalysts were both employed as the PEMFC cathode catalysts.The platinum content in the cathode were all 0.08 mg/cm^2.The maximum power densities and the cathode catalyst mass specific power densities were 763 mW/cm^2 and 9.54 kW/g Pt for Pt/FePO4/C cathode,and 663 mW/cm^2 and 8.29 kW/g Pt for Pt/C cathode.This indicates that the catalytic activity of Pt/FePO4/C is higher than Pt/C when they are employed as cathode catalysts of PEMFC.