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Charge Storage Mechanisms of Single-Layer Graphene in Ionic Liquid

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.
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https://hal.archives-ouvertes.fr/hal-02519714
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Submitted on : Thursday, March 26, 2020 - 11:30:39 AM
Last modification on : Saturday, March 28, 2020 - 1:57:23 AM
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Jianglin Ye, Yih-Chyng Wu, Kui Xu, Kun Ni, Na Shu, et al.. Charge Storage Mechanisms of Single-Layer Graphene in Ionic Liquid. Journal of the American Chemical Society, American Chemical Society, 2019, 141 (42), pp.16559-16563. ⟨10.1021/jacs.9b07134⟩. ⟨hal-02519714⟩

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