期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 55, 期 20, 页码 5990-5993出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201600133
关键词
Co3O4; hierarchical microtubes; hollow nanoparticles; lithium-ion batteries; ZIF-67
资金
- Ministry of Education (Singapore) [MOE2014-T2-1-058, ARC41/14, M4020223.120]
Hierarchical tubular structures composed of Co3O4 hollow nanoparticles and carbon nanotubes (CNTs) have been synthesized by an efficient multi-step route. Starting from polymer-cobalt acetate (Co(Ac)(2)) composite nanofibers, uniform polymer-Co(Ac)(2)@zeolitic imidazolate framework-67 (ZIF-67) core-shell nanofibers are first synthesized via partial phase transformation with 2-methylimidazole in ethanol. After the selective dissolution of polymer-Co(Ac)(2) cores, the resulting ZIF-67 tubular structures can be converted into hierarchical CNTs/Co-carbon hybrids by annealing in Ar/H-2 atmosphere. Finally, the hierarchical CNT/Co3O4 microtubes are obtained by a subsequent thermal treatment in air. Impressively, the as-prepared nanocomposite delivers a high reversible capacity of 1281mAhg(-1) at 0.1Ag(-1) with exceptional rate capability and long cycle life over 200 cycles as an anode material for lithium-ion batteries.
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