Room temperature ionic liquids (RTIL) are promising electrolytes for electrochemical supercapacitors, due to their wide electrochemical stability range, low volatility and high capacitance. A molecular level understanding of the RTIL/graphene interface during charging and discharging processes is necessary to utilize that potential. We used in situ real-time x-ray reflectivity to determine the change in electric double layer (EDL) structure of imidazolium-based [Tf2N?-?] ionic liquids on the epitaxial graphene interface with the applied potential, and compared the results with the simultaneously-collected cyclic voltammetry data at different scan rates. X-ray reflectivity data were also obtained at a series of fixed potentials to investigate the similarities and differences between the dynamic and static structures at the interface.

Study of time and potential dependent evolution in room temperature ionic liquid structure at epitaxial graphene interface

246th National Meeting (2013)

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