Efficient Graphene Production by Combined Bipolar Electrochemical Intercalation and High-Shear Exfoliation.

ABSTRACT: In this study, we demonstrate that bipolar electrochemistry is a viable strategy for "wireless" electrochemical intercalation of graphite flakes and further large-scale production of high-quality graphene suspensions. Expansion of the graphite layers leads to a dramatic 20-fold increase in the yield of high-shear exfoliation. Large graphite flakes, which do not produce graphene upon high shear if left untreated, are exfoliated in a yield of 16.0 ± 0.2%. Successful graphene production was confirmed by Raman spectroscopy and scanning transmission electron microscopy, showing that the graphene flakes are 0.4-1.5 μm in size with the majority of flakes consisting of 4-6 graphene layers. Moreover, a low intensity of the D peak relative to the G peak as expressed by the I _D/I

SUBMITTER: Bjerglund ET 

PROVIDER: S-EPMC6645314 | biostudies-literature | 2017 Oct

REPOSITORIES: biostudies-literature