Abstract:Pr1-x(La0.37Ce0.63)xCoO3 was prepared by sol-gel method. Decomposition characteristics of dry gel precursors were investigated by TG-DSC and changes of chemical bonds of heat treatment were analyzed by FT-IR. Microstructure, morphology and element distribution of prepared powders were determined by XRD and SEM-EDS. Electro-catalytic activity of powders for oxygen reduction reaction ORR in alkali solution were investigated by CV, LSV and RRDE techniques. The results show that when calcined at 700 ℃, x<0.4, impurity of La2O3 and CeO2 appear, perovskite crystal structures disappear when x>0.4, and pure phase powder is porous when x=0.4. Mass activity (current density) of Pr1-x(La0.37Ce0.63)xCoO3 powder is 172.54 mA/mg, 1.7 times higher than that of commercial Pt/C, but half-wave potential is only 0.60 V (vs. RHE). It is a two-electron process in oxygen reduction reaction, and yield of by-product H2O2 is 77%. It can be further enhanced as catalyst material.