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Optimization of graphene synthesis by electrochemical exfoliation of graphite

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2019
Kurt, Vahit
Graphene is a one atom thick allotrope of carbon that is a honeycomb lattice of carbon atoms. Graphene has a lot of extraordinary properties and these properties cause increasing of interest on it. In addition to high specific surface area, high transparency, high strength, graphene is the material that has best electrical conductivity ever. These properties make graphene a suitable candidate for a lot of applications. Since its discovery, a lot of research has been done about how to produce graphene and how to use it efficiently but researchers are still not being able to produce graphene at large amounts. Therefore, graphene suffers from having high prices and can only be used for some special applications. In this study, graphene was synthesized by electrochemical exfoliation of graphite which is one of the most cost effective ways to produce high quality graphene with high production rate. In this method, a potential difference is applied between the electrodes (either of which is graphite) in an electrolytic cell and graphene sheets are exfoliated from graphite electrode. In this study, process parameters like applied potential, type of electrolyte and electrolyte additives and cell geometry were optimized to produce high quality graphene with high yield. Synthesized graphene was characterized using SEM, EDS, TEM, XRD, AFM, BET, FTIR and Raman spectroscopy