“…27,28 Whereas, to the best of our knowledge, the investigation on the Ag-doped LaMnO 3 perovskite as the ORRC has not been reported, though it has been widely applied as the solid oxide fuel cell cathode, NO oxidation catalyst and electromagnetic material. [29][30][31][32][33][34][35][36][37][38][39][40][41][42] In this work, a series of La 1Àx Ag x MnO 3 (x ¼ 0, 0.15, 0.3 and 0.45) perovskites were prepared by an improved sol-gel method. And the La 0.7 Ag 0.3 MnO 3 exhibits the optimal catalytic activity toward ORR, which can be ascribed to the regulation of Mn valence state and improvement of the oxygen absorption ability by the substitution of Ag.…”