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Updated: May 2, 2026
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Published on: August 12, 2013
Charge Storage Mechanisms of Single-Layer Graphene in Ionic Liquid
Jianglin Ye1,2, Yih-Chyng Wu2,3, Kui Xu2,3
1Hefei National Research Center for Physical Sciences at the Microscale, CAS Key Laboratory of Materials for Energy Conversion, and Department of Materials Science and Engineering , University of Science and Technology of China , Hefei , Anhui 230026 , P. R. China.
Abstract:
Graphene-based carbon materials are promising candidates for electrical double-layer (EDL) capacitors, and there is considerable interest in understanding the structure and properties of the graphene/electrolyte interface. Here, electrochemical impedance spectroscopy (EIS) and electrochemical quartz crystal microbalance (EQCM) are used to characterize the ion fluxes and adsorption on single-layer graphene in neat ionic liquid (EMI-TFSI) electrolyte. It is found that a positively charged ion-species desorption and ion reorganization dominate the double-layer charging during positive and negative polarizations, respectively, leading to the increase in EDL capacitance with applied potential.
