期刊
ELECTROCHIMICA ACTA
卷 232, 期 -, 页码 296-302出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2017.02.155
关键词
La1-xSrxMnO3; perovskite; ORR; OER; Li-O-2 batteries
资金
- National Natural Science Foundation of China [51472070, 51272004, U1361110]
- CAS Key Laboratory of Materials for Energy Conversion [KF2014004]
- Hefei University of Technology [407-037171]
Strontium (Sr)-doped perovskite oxide La1-xSrxMnO3 (x=0, 0.2, 0.6) composites are prepared by sol-gel process assisted with chelating effect of citric acid, which was used as catalysts for oxygen cathode in rechargeable lithium air batteries. Sr-doped perovskite oxide La1-xSrxMnO3 composites demonstrate higher catalytic activities than that of the pure LaMnO3. In particular, the La0.4Sr0.6MnO3 had a lower total over potential between the oxygen evolution reaction (OER) and the oxygen reduction reaction (ORR) than that of the La0.8S0.2MnO3 and LaMnO3. When the Li-O-2 cells were tested at the current density of 50 mA g(-1), the discharge capacities of the oxygen cathode with different La1-xSrxMnO3 (x=0, 0.2, 0.6) catalysts were 3573, 4408, and 5624 mA h g(-1), respectively. Additionally, the cell employed La0.4Sr0.6MnO3 as catalyst can be cycled at a limited capacity of 200 mA h g(-1) for about 71cycles, which is much higher than the 42 cycles for LaMnO3 electrode. (C) 2017 Elsevier Ltd. All rights reserved.
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