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Hierarchical Tubular Structures Composed of Co 3 O 4 Hollow Nanoparticles and Carbon Nanotubes for Lithium Storage
Author(s) -
Chen Yu Ming,
Yu Le,
Lou Xiong Wen David
Publication year - 2016
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201600133
Subject(s) - materials science , zeolitic imidazolate framework , chemical engineering , nanoparticle , nanocomposite , carbon nanotube , annealing (glass) , cobalt , lithium (medication) , polymer , anode , nanofiber , dissolution , nanotechnology , thermal treatment , thermal decomposition , composite number , metal organic framework , composite material , electrode , adsorption , chemistry , organic chemistry , medicine , endocrinology , engineering , metallurgy
Hierarchical tubular structures composed of Co 3 O 4 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/Co 3 O 4 microtubes are obtained by a subsequent thermal treatment in air. Impressively, the as‐prepared nanocomposite delivers a high reversible capacity of 1281 mAh g −1 at 0.1 A g −1 with exceptional rate capability and long cycle life over 200 cycles as an anode material for lithium‐ion batteries.