Abstract
Electrochemical reductive exfoliation of graphite to few layered graphene (FLG) in presence of 1-ethyl-2,3-dimethyl imidazolium bis(trifluoromethylsulfonyl) imide ionic liquid and redox ionic liquid based ferrocene has been investigated. Thus, by applying a mild negative potential (−2.7 V vs. Fc/Fc+) to carbon electrode in ionic liquid graphene flakes could be generated. The generated materials have been characterized by X-ray photoelectron spectroscopy, Raman spectroscopy, high resolution transmission electron microscopy and atomic force microscopy. XPS and Raman analysis show that the electrochemical reductive exfoliation provides the formation of FLG. The thickness of the resulting FLG was found to be ranged between 4 and 1 nm. HR-TEM images reveal the formation of few graphene layers and in some cases single graphene layer was observed. Moreover, this electrochemical route conduces to the formation of ionic liquid functionalized FLG. Finally, the reductive exfoliation was further investigated in the presence of redox ionic liquid. XPS and electrochemical measurements confirm the presence of ferrocene.
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Acknowledgements
This work was supported by the European Community Seventh Framework Programme (266391). The authors thank Dr. Philippe Decorse for performing the XPS measurements and for the valuable discussions.
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Gómez-Mingot, M., Anbalagan, A.C., Randriamahazaka, H. et al. Electrochemical synthesis and the functionalization of few layer graphene in ionic liquid and redox ionic liquid. Sci. China Chem. 61, 598–603 (2018). https://doi.org/10.1007/s11426-017-9184-0
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DOI: https://doi.org/10.1007/s11426-017-9184-0