Liu Xiao, Gong Hao, Wang Tao, Guo Hu, Song Li, Xia Wei, Gao Bin, Jiang Zhongyi, Feng Linfei, He Jianping
College of Materials Science and Technology, Jiangsu Key Laboratory of Materials and Technology for Energy Conversion, Nanjing University of Aeronautics and Astronautics, 210016, Nanjing, P.R. China.
Chem Asian J. 2018 Mar 2;13(5):528-535. doi: 10.1002/asia.201701561. Epub 2018 Feb 8.
Perovskite-type oxides based on rare-earth metals containing lanthanum manganate are promising catalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in alkaline electrolyte. Perovskite-type LaMnO shows excellent ORR performance, but poor OER activity. To improve the OER performance of LaMnO , the element cobalt is doped into perovskite-type LaMnO through a sol-gel method followed by a calcination process. To assess electrocatalytic activities for the ORR and OER, a series of LaMn Co O (x=0, 0.05, 0.1, 0.2, 0.3, 0.4, and 0.5) perovskite oxides were synthesized. The results indicate that the amount of doped cobalt has a significant effect on the catalytic performance of LaMn Co O . If x=0.3, LaMn Co O not only shows a tolerable electrocatalytic activity for the ORR, but also exhibits a great improvement (>200 mV) on the catalytic activity for the OER; this indicates that the doping of cobalt is an effective approach to improve the OER performance of LaMnO . Furthermore, the results demonstrate that LaMn Co O is a promising cost-effective bifunctional catalyst with high performance in the ORR and OER for application in hybrid Li-O batteries.
基于含镧锰酸盐的稀土金属的钙钛矿型氧化物是碱性电解质中氧还原反应（ORR）和析氧反应（OER）的有前景的催化剂。钙钛矿型LaMnO表现出优异的ORR性能，但OER活性较差。为了提高LaMnO的OER性能，通过溶胶 - 凝胶法随后进行煅烧过程将元素钴掺杂到钙钛矿型LaMnO中。为了评估对ORR和OER的电催化活性，合成了一系列LaMnCoO（x = 0、0.05、0.1、0.2、0.3、0.4和0.5）钙钛矿氧化物。结果表明，掺杂钴的量对LaMnCoO的催化性能有显著影响。当x = 0.3时，LaMnCoO不仅对ORR表现出可接受的电催化活性，而且对OER的催化活性有很大提高（>200 mV）；这表明钴的掺杂是提高LaMnO的OER性能的有效方法。此外，结果表明LaMnCoO是一种有前景的具有成本效益的双功能催化剂，在混合锂氧电池的ORR和OER中具有高性能。
