期刊
JOURNAL OF POWER SOURCES
卷 470, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.228317
关键词
Overpotential; Cycling ability; Lithium-oxygen batteries; Heterostructures; Oxygen adsorption
资金
- Australian Research Council (ARC) [DP180101453]
Li-O-2 batteries has been widely investigated for its ultra-high capacity as next generation batteries. Nevertheless, some problems like sluggish kinetic reaction and instability hugely impede the practical use of Li-O-2 batteries. In this work, Mo2C/MoO2@RGO heterostructures was fabricated by in-situ growth of Mo2C between MoO2 and RGO during calcination and being employed as cathode to explore the synergistic effect in Li-O-2 batteries. As a result, Mo2C/MoO2@RGO exhibits good specific capacity with 2365 mAh g(-1), high round-trip efficiency (89% at first cycle) and improved cycling performance. Density functional theory calculations indicated that the Mo2C/MoO2@RGO heterostructures have better capability of oxygen adsorption than sole constituent (Mo2C@RGO or MoO2@RGO), which triggers the formation of film-like amorphous discharge products, leading to lower over-potential and stable performance. Our study reveals the important role of heterostructures in Li-O-2 batteries system and demonstrates a promising design strategy for heterostructured catalyst.
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