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Co 3 O 4 Hollow Nanoparticles and Co Organic Complexes Highly Dispersed on N‐Doped Graphene: An Efficient Cathode Catalyst for Li‐O 2 Batteries
Author(s) -
Zhang Zhang,
Chen Yanan,
Bao Jie,
Xie Zhaojun,
Wei Jinping,
Zhou Zhen
Publication year - 2015
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.201400242
Subject(s) - materials science , cathode , graphene , catalysis , calcination , bifunctional , chemical engineering , electrochemistry , nanoparticle , current density , nanotechnology , composite number , electrode , composite material , chemistry , organic chemistry , physics , quantum mechanics , engineering
Rechargeable Li‐O 2 batteries are promising candidates for electric vehicles due to their high energy density. However, the current development of Li‐O 2 batteries demands highly efficient air cathode catalysts for high capacity, good rate capability, and long cycle life. In this work, a hydrothermal‐calcination method is presented to prepare a composite of Co 3 O 4 hollow nanoparticles and Co organic complexes highly dispersed on N‐doped graphene (Co–NG), which acts as a bifunctional air cathode catalyst to optimize the electrochemical performances of Li‐O 2 batteries. Co–NG exhibits an outstanding initial discharge capacity up to 19 133 mAh g −1 at a current density of 200 mA g −1 . In addition, the batteries could sustain 71 cycles at a cutoff capacity of 1000 mAh g −1 with low overpotentials at the current density of 200 mA g −1 . Co–NG composites are attractive as air cathode catalysts for rechargeable Li‐O 2 batteries.