Ye, Jianglin and Wu, Yih-Chyng
and Xu, Kui
and Ni, Kun and Shu, Na and Taberna, Pierre-Louis
and Zhu, Yanwu and Simon, Patrice
Charge Storage Mechanisms of Single-Layer Graphene in Ionic Liquid.
(2019)
Journal of the American Chemical Society, 141 (42). 16559-16563. ISSN 0002-7863
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(Document in English)
PDF (Author's version) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader 3MB |
Official URL: https://doi.org/10.1021/jacs.9b07134
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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