期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 30, 页码 25465-25472出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b07924
关键词
Li-O-2 battery; perovskite; cation segregation; catalysts; oxygen electrode
资金
- National Natural Science Foundation of China [21427802, 21671076, 21621001]
Cation segregation of perovskite oxide is crucial to develop high-performance catalysts. Herein, we achieved the exsolution of alpha-Fe2O3 from parent La0.85FeO3-delta by a simple heat treatment. Compared to alpha-Fe2O3 and La0.85FeO3-delta, alpha-Fe2O3-LaFeO3-x achieved a significant improvement of lithium-oxygen battery performance in terms of discharge specific capacity and cycling stability. The promotion can be attributed to the interaction between alpha-Fe2O3 and LaFeO3-x. During the cycling test, alpha-Fe2O3-LaFeO3-x can be stably cycled for 108 cycles at a limited discharge capacity of 500 mAh g(-1)at a current density of 100 mA g(-1) which is remarkably longer than those of La(0.85)Feo(3-delta )(51 cycles), alpha-Fe2O3 (21 cycles), and mechanical mixing of LaFeO3 and alpha-Fe2O3 (26 cycles). In general, these results suggest a promising method to develop efficient lithium-oxygen battery catalysts via segregation.
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