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Electrochemical Formation of a Covalent–Ionic Stage‑1 Graphite Intercalation Compound with Trifluoroacetic Acid

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journal contribution
posted on 27.12.2021, 18:36 authored by Bartosz Gurzęda, Tae In Kim, Madi Arsakay, Myeonggi Choe, Sun Hwa Lee, Zonghoon Lee, Seung Kyu Min, Rodney S. Ruoff
A pure stage-1 graphite intercalation compound (GIC) has been prepared by the electrochemical oxidation of graphite in trifluoroacetic acid (CF3COOH). During the CF3COOH-GIC formation, covalent as well as ionic bonds between the trifluoroacetic acid and graphite layers are formed. Electrochemical reduction of the stage-1 GIC leads to the deintercalation of ionically bonded intercalate, yielding the stage-2 covalent GIC. The interlayer spacing is 8.10 Å for stage-1 and 11.62 Å for stage-2 GIC. Further electrochemical oxidation of stage-1 CF3COOH-GIC does not lead to the exfoliation of the GIC product, and the GIC has relatively high stability in air.