La0.8Sr0.2Co1-xMnxO3 perovskites as efficient bi-functional cathode catalysts for rechargeable zinc-air batteries. (10th November 2017)

• Record Type: Journal Article
• Authors: Wang, Qin; Xue, Yejian; Sun, Shanshan; Li, Shihua; Miao, He; Liu, Zhaoping
• Is Part Of: Electrochimica acta. Volume 254(2017)
• Page Start: 14
• Page End: 24
• Publication Date: 2017-11-10
• Subjects: Oxygen reduction reaction -- Oxygen evolution reaction -- Bi-functional electrocatalyst -- Perovskite -- Zinc-air battery; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2017.09.034
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: Abstract: In this work, the La0.8 Sr0.2 Co1-x Mnx O3 (x = 0, 0.2, 0.4, 0.6, 0.8, 1) perovskites (LSCM) were synthesized by a facile improved sol–gel method. The crystalline structures, morphologies, Co/Mn valence states and oxygen adsorption/desorption behavior of the LSCM materials are systematically studied, and their catalytic activities toward ORR and OER are investigated by the rotating-disk electrode (RDE) and zinc-air battery techniques. It is found that the proper substitution of Co with Mn can efficiently improve the ORR and OER activities of La0.8 Sr0.2 CoO3 perovskite at the same time. The LSCM-60 catalyst exhibits the optimum bi-functional activity. It is mainly attributed to the regulation of the Bi-site Co/Mn valence states and the improvement of the oxygen adsorption/desorption capability. Besides of the good bi-functional property, LSCM-60 shows superior durability compared with Pt/C and IrO2 catalysts. When using LSCM-60 as the cathode catalyst of zinc-air batteries, the low charge-discharge overpotential (1.05 V at 50 mA cm −2 ) and the excellent long-term cycle stability were obtained. This study exhibits the possibility to improve the bi-functional activity of La0.8 Sr0.2 CoO3 through a simple doping process.