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Hierarchical Graphene‐Rich Carbon Materials with Trace Nonprecious Metals for High‐Performance Li–O 2 Batteries
Author(s) -
Li Jing,
Zhang Yining,
Zhou Wei,
Nie Hongjiao,
Wu Baoshan,
Zhang Huamin
Publication year - 2015
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.201402044
Subject(s) - graphene , materials science , carbon fibers , cobalt , transition metal , electrochemistry , chemical engineering , electrode , catalysis , nanotechnology , cathode , inorganic chemistry , composite number , chemistry , composite material , metallurgy , organic chemistry , engineering
Sluggish kinetic characteristics of the electrode reactions and low electrode space utilization for solid Li 2 O 2 deposition are limiting factors for Li–O 2 batteries. In this work, iron‐/cobalt‐doped micron‐sized honeycomb‐like carbon (Fe‐MHC, Co‐MHC) with a hierarchical pore structure is prepared by using nano‐CaCO 3 as a template. The effect of the transition‐metal nanoparticles as a second template on further pore construction and optimization is presented. As graphitization catalysts, the added transition metals also affect the formation of the graphene‐rich structure in the carbon framework. As a result, the obtained hierarchical carbon materials doped with trace metals exhibit higher electrochemical catalytic activity and stability than non‐doped samples. In particular, an enhanced discharge capacity as high as 9260 mAh g −1 is achieved for the Fe‐MHC cathode, which is attributed to its enlarged pore volume and high utilization of the electrode space.