摘要
No-precious bifunctional catalysts with high electrochemical activities and stability were crucial to properties of rechargeable zinc-air batteries.Herein,LaNiO3 modified with Ag nanoparticles(Ag/LaNiO3)was prepared by the co-synthesis method and evaluated as the bifunctional oxygen catalyst for oxygen reduction reaction(ORR)and oxygen evolution reaction(OER).Compared with LaNiO3,Ag/LaNiO3 demonstrated the enhanced catalytic activity towards ORR/OER as well as higher limited current density and lower onset potential.Moreover,the potential gap between ORR potential(at-3 mA cm^-2)and OER potential(at 5 mA cm^-2)was 1.16 V.The maximum power density of the primary zinc-air battery with Ag/LaNiO3 catalyst achieved 60 mW cm^-2.Furthermore,rechargeable zinc-air batteries operated reversible charge-discharge cycles for 150 cycles without noticeable performance deterioration,which showed its excellent bifunctional activity and cycling stability as oxygen electrocatalyst for rechargeable zinc-air batteries.These results indicated that Ag/LaNiO3 prepared by the co-synthesis method was a promising bifunctional catalyst for rechargeable zinc-air batteries.
基金
This work was supported by the National Natural Science Foundation of China(Grant Nos.51372057 and 21373071).
