以碳纳米粉(XC-72R)作为载体，采用三种不同方法合成Pt/C负载型催化剂。利用X射线衍射(XRD)、透射电镜(TEM)、循环伏安法(CV)、恒电位测试(Potentiostatic)以及线性极化分析（Potentiodynamic polarization）等手段进行催化剂表征，结果表明，微乳法制得的负载型催化剂，活性组分的颗粒尺寸为5～10nm，且均匀地分散在载体表面，其电化学性能良好。而微乳法进一步制备的含不同比例的负载型的PtIr/C催化剂，其中以Pt85Ir15表现出更为较好的电化学综合性能。

The Pt/C electrocatalysts were prepared by three different systems and the PtIr/C electrocatalysts were prepared with four different Ir contents. The samples were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), cyclic voltammetry (CV), potentiostatic and potentiodynamic polarizations measurements. The experimental results confirmed that the electrocatalyst particles prepared by the microemulsion method were well distributed on XC-72R supports with the active particle sizes of 5～10nm and good electrocatalysts activity. The Pt85Ir15/C electrocatalysts showed the highest overall electrochemical activity in unitized regenerative fuel cell.