ja9b07134_si_001.pdf (1.28 MB)
Charge Storage Mechanisms of Single-Layer Graphene in Ionic Liquid
journal contribution
posted on 2019-10-10, 13:37 authored by Jianglin Ye, Yih-Chyng Wu, Kui Xu, Kun Ni, Na Shu, Pierre-Louis Taberna, Yanwu Zhu, Patrice SimonGraphene-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.
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EISion fluxescharge Storage MechanismsEQCMelectrochemical impedance spectroscopyelectrolytecandidatedouble-layeradsorptionpolarizationIonic Liquid Graphene-based carbon materialsion-species desorptionEDL capacitanceSingle-Layer GrapheneEMI-TFSIunderstandingion reorganizationcapacitorinterfaceelectrochemical quartz crystal microbalancesingle-layer graphene
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