期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 4, 页码 3624-3633出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b13153
关键词
nitrogen-doped carbon; metal-organic frameworks; cobalt selenide; sodium ion batteries; anode
资金
- National Natural Science Foundation of China [51302323, 51374255, 51322403]
- Program for New Century Excellent Talents in University [NCET-13-0594]
- Research Fund for the Doctoral Program of Higher Education of China [201301621200]
- Natural Science Foundation of Hunan Province, China [14JJ3018]
- Fundamental Research Funds for the Central Universities of Central South University [2016zzts026]
In this work, nitrogen-doped, yolk shell-structured CoSe/C mesoporous dodecahedra are successfully prepared by using cobalt-based metal-organic frameworks (ZIF-67) as sacrificial templates. The CoSe nanoparticles are in situ produced by reacting the cobalt species in the metal-organic frameworks with selenium (Se) powder, and the organic species are simultaneously converted into nitrogen-doped carbon material in an inert atmosphere at temperatures between 700 and 900 degrees C for 4 h. For the composite synthesized at 800 degrees C, the carbon framework has a relatively higher extent of graphitization, with high nitrogen content (17.65%). Furthermore, the CoSe nanoparticles, with a size of around 15 nm, are coherently confined in the mesoporous carbon framework. When evaluated as novel anode materials for sodium ion batteries, the CoSe/C composites exhibit high capacity and superior rate capability. The composite electrode delivers the specific capacities of 597.2 and 361.9 mA h g(-1) at 0.2 and 16 A g(-1), respectively.
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