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Issue 40, 2017
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Electrochemically exfoliated graphene as a novel microwave susceptor: the ultrafast microwave-assisted synthesis of carbon-coated silicon−graphene film as a lithium-ion battery anode

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Abstract

Graphene nanocomposites have attracted much attention in many applications due to their superior properties. However, preparing graphene nanocomposites requires a time-consuming thermal treatment to reduce the graphene or synthesize nanomaterials, in most cases. We present an ultrafast synthesis of a carbon-coated silicon−graphene nanocomposite using a commercial microwave system. Electrochemically exfoliated graphene is used as a novel microwave susceptor to deliver efficient microwave energy conversion. Unlike graphene oxide, it does not require a time-consuming pre-thermal reduction or toxic chemical reduction to absorb microwave radiation efficiently. A carbon-coated silicon nanoparticle−electrochemically exfoliated graphene nanocomposite film was prepared by a few seconds’ microwave irradiation. The sp2 domains of graphene absorb microwave radiation and generate heat to simultaneously reduce the graphene and carbonize the polydopamine carbon precursor. The as-prepared N-doped carbon-coated silicon−graphene film was used as a lithium-ion battery anode. The N-doped carbon coating decreases the contact resistance between silicon nanoparticles and graphene provides a wide range conductive network. Consequently, it exhibited a reversible capacity of 1744 mA h g−1 at a current density of 0.1 A g−1 and 662 mA h g−1 at 1.0 A g−1 after 200 cycles. This method can potentially be a general approach to prepare various graphene nanocomposites in an extremely short time.

Graphical abstract: Electrochemically exfoliated graphene as a novel microwave susceptor: the ultrafast microwave-assisted synthesis of carbon-coated silicon−graphene film as a lithium-ion battery anode

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Supplementary files

Article information


Submitted
28 Jun 2017
Accepted
15 Sep 2017
First published
15 Sep 2017

Nanoscale, 2017,9, 15582-15590
Article type
Paper

Electrochemically exfoliated graphene as a novel microwave susceptor: the ultrafast microwave-assisted synthesis of carbon-coated silicon−graphene film as a lithium-ion battery anode

J. M. Kim, D. Ko, J. Oh, J. Lee, T. Hwang, Y. Jeon, W. Hooch Antink and Y. Piao, Nanoscale, 2017, 9, 15582
DOI: 10.1039/C7NR04657J

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