Towards the continuous production of high crystallinity graphene via electrochemical exfoliation with molecular in situ encapsulation

Nanoscale
Chia-Hsuan ChenChing-Yuan Su

Abstract

Large-scale production of uniform and high-quality graphene is required for practical applications of graphene. The electrochemical exfoliation method is considered as a promising approach for the practical production of graphene. However, the relatively low production rate of graphene currently hinders its usage. Here, we demonstrate, for the first time, a rapid and high-yield approach to exfoliate graphite into graphene sheets via an electrochemical method with small molecular additives; where in this approach, the use of melamine additives is able to efficiently exfoliate graphite into high-quality graphene sheets. The exfoliation yield can be increased up to 25 wt% with melamine additives compared to electrochemical exfoliation without such additives in the electrolyte. The proposed mechanism for this improvement in the yield is the melamine-induced hydrophilic force from the basal plane; this force facilitates exfoliation and provides in situ protection of the graphene flake surface against further oxidation, leading to high-yield production of graphene of larger crystallite size. The residual melamine can be easily washed away by water after collection of the graphene. The exfoliation with molecular additives exhibits hig...Continue Reading

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Feb 3, 2016·Advanced Materials·Sheng YangXinliang Feng
Dec 16, 2016·Physical Chemistry Chemical Physics : PCCP·Hengcong TaoJohn Texter
Mar 9, 2017·Nanoscale·Vitaly V Chaban, Oleg V Prezhdo
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