期刊
CHEMICAL ENGINEERING JOURNAL
卷 364, 期 -, 页码 503-513出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.01.191
关键词
ZIF-8 nanocubes; ZnSe nanocomposites; Anode materials; Li-ion batteries; Enhanced electrochemical performances
资金
- National Natural Science Foundation, China [21773057, U1704142, 21403057]
- Program for Innovative Team (in Science and Technology) in University of Henan Province, China [17IRTSTHN003]
- Program for Science and Technology Innovation Talents in Universities of Henan Province, China [18HASTIT008]
- Postdoctoral Science Foundation, China [2017M621833]
- Zhongyuan Thousand People Plan-The Zhongyuan Youth Talent Support Program (in Science and Technology), China [ZYQR201810139]
- Cultivation Plan for Young Core Teachers in Universities of Henan Province, China [2016GGJS-068]
- Natural Science Foundation of Henan Province, China [162300410050]
- Fundamental Research Funds for the Henan Provincial Colleges and Universities in Henan University of Technology, China [2018RCJH01]
ZnSe is regarded as a promising anode material for reversible Li-ion batteries because of its high theoretical capacity. Herein, we report a facile chemical precipitation method to controllably synthesize ZIF-8 nanocubes and then select them as sacrificial templates to prepare ZnSe nanoparticles embedded N-doped carbon nanocubes. The as-obtained ZnSe/carbon nanocomposite at 600 degrees C demonstrates a high initial discharge capacity of 1170.8 mAh g(-1) with the initial columbic efficiency of 68.8% at the current density of 0.1 A g(-1) in the voltage range of 0.01 3 V. In addition, it displays a reversible capacity of 1166.6 mAh g(-1) after 500 cycles at the current density of 0.5 A g(-1), indicating the excellent cyclic stability for the designed composites. The enhanced electrochemical performance can be ascribed to its high specific surface area (493.45 m(2) g(-1)) and unique mesoporous structure, which provides efficient Li+ transport channels and additional storage sites. Furthermore, the existence of faradaic pseudocapacitance in ZnSe/carbon nanocomposites also affords additional capacity and contributes to the increased capacity with respect to charge/discharge cycle number.
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