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A Catalytic Microwave Process for Superfast Preparation of High‐Quality Reduced Graphene Oxide
Author(s) -
Liu Runze,
Zhang Yu,
Ning Zhenjian,
Xu Yuxi
Publication year - 2017
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201708714
Subject(s) - graphene , graphite , materials science , oxide , exfoliation joint , catalysis , crystallinity , microwave , graphite oxide , chemical engineering , anode , conductivity , inorganic chemistry , nanotechnology , composite material , chemistry , electrode , metallurgy , organic chemistry , physics , quantum mechanics , engineering
Herein we report that a small amount of graphite can unexpectedly act as the catalyst to greatly promote the microwave exfoliation and reduction of graphite oxide in ambient air. The reaction can be finished in a few seconds in contrast to more than ten minutes without catalyst. The catalytic microwave exfoliated graphite oxide (CMEGO) is of higher quality than the traditional microwave exfoliated graphite oxide, including a much higher exfoliation degree with thinner graphene sheets and higher specific surface area (886 m 2 g −1 vs. 466 m 2 g −1 ), a much larger C/O ratio (19.4 vs. 6.3) and a higher lattice crystallinity, as well as significantly improved electrical conductivity (53180 S m −1 vs. 5140 S m −1 ). The CMEGO is used as anode for lithium‐ion battery (LIB) and sodium‐ion battery (SIB), and delivers ultrahigh reversible capacities, remarkable rate capabilities, and superior cycling stabilities in both LIB and SIB.