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Catalyst-Free Growth of Three-Dimensional Graphene Flakes and Graphene/g‑C3N4 Composite for Hydrocarbon Oxidation
journal contribution
posted on 2016-02-26, 00:00 authored by Ke Chen, Zhigang Chai, Cong Li, Liurong Shi, Mengxi Liu, Qin Xie, Yanfeng Zhang, Dongsheng Xu, Ayyakkannu Manivannan, Zhongfan LiuMass production of high-quality graphene
flakes is important for
commercial applications. Graphene microsheets have been produced on
an industrial scale by chemical and liquid-phase exfoliation of graphite.
However, strong-interaction-induced interlayer aggregation usually
leads to the degradation of their intrinsic properties. Moreover,
the crystallinity or layer-thickness controllability is not so perfect
to fulfill the requirement for advanced technologies. Herein, we report
a quartz-powder-derived chemical vapor deposition growth of three-dimensional
(3D) high-quality graphene flakes and demonstrate the fabrication
and application of graphene/g-C3N4 composites.
The graphene flakes obtained after the removal of growth substrates
exhibit the 3D curved microstructure, controllable layer thickness,
good crystallinity, as well as weak interlayer interactions suitable
for preventing the interlayer stacking. Benefiting from this, we achieved
the direct synthesis of g-C3N4 on purified graphene
flakes to form the uniform graphene/g-C3N4 composite,
which provides efficient electron transfer interfaces to boost its
catalytic oxidation activity of cycloalkane with relatively high yield,
good selectivity, and reliable stability.