期刊
NANOSCALE HORIZONS
卷 4, 期 4, 页码 991-998出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8nh00484f
关键词
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资金
- National Key Project of MOST [2018YFB0104301]
- National Natural Science Foundation Committee of China [51425301, U1601214, 51573013, 51773092, 51772147]
- 1000 Youth Talents Plan of the National Natural Science Foundation of China [51773092]
- Research Foundation of State Key Lab [ZK201717]
- Jiangsu Distinguished Professorship Program
Aqueous rechargeable batteries with advantages of safety, low cost, and environmental kindness have displayed high feasibility of practical applications for large-scale energy storage. Developing high-performance electrode materials is a necessary gateway to commercially available batteries. Here, we demonstrate the controlled synthesis of sodium iron hexacyanoferrates, (NaFeFeII)-Fe-III(CN)(6) (Na-FeHCFs). Ball-cutting Na-FeHCF nanocubes are first synthesized and used as a cathode material for aqueous ammonium-ion batteries. Due to fast charge transfer and diffusion, the ball-cutting Na-FeHCF nanocubes exhibit a high discharge capacity of 62 mA h g(-1) at 0.25 A g(-1) and 77.4% capacity retention at 2 A g(-1). Such excellent capacity and rate performance are superior to those of other Na-FeHCFs and the reported ammonium-ion intercalation cathodes. Furthermore, they present unparalleled cycling stability with no capacity loss over 50 000 cycles, thanks to the highly stable redox reaction of the high-spin nitrogen-coordinated Fe-II/Fe-III (Fe-H) couple. This work supplies a new view to design high-performance cathode materials for ammonium ion storage.
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