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Deciphering the Influence of Electrolytes on the Energy Storage Mechanism of Vertically-Oriented Graphene Nanosheet Electrodes by Using Advanced Electrogravimetric Methods

  • Electrolyte composition is a crucial factor determining the capacitive properties of a supercapacitor device. However, its complex influence on the energy storage mechanisms has not yet been fully elucidated. For this purpose, in this study, the role of three different types of electrolytes based on a propylene carbonate (PC) solution containing tetrabutylammonium perchlorate (TBAClO4), lithium perchlorate (LiClO4) and butyltrimethylammonium bis(trifluoromethylsulfonyl)imide (N1114TFSI) ionic liquid on vertically-oriented graphene nanosheet electrodes has been investigated. Herein, in situ electrochemical quartz crystal microbalance (EQCM) and its coupling with electrochemical impedance spectroscopy (EIS), known as ac-electrogravimetry, have allowed the dynamic aspects of the (co)electroadsorption processes at the electrode-electrolyte interface to be examined. A major contribution of ClO4− anions (TBAClO4) was evidenced, whereas in the PC/N1114TFSI mixture (50:50 wt%) both anions (TFSI−) and cations (N1114+) were symmetrically exchanged during cycling. In the particular case of LiClO4, solvation of Li+ cations in PC was involved, affecting the kinetics of electroadsorption. These results demonstrate the suitability of dynamic electrogravimetric methods to unveil the interfacial exchange properties of mobile species for the conception of new high performance energy storage devices.

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Document Type:Article
Author:Tao Lé, Gérard Bidan, Florence Billon, Marc Delaunay, Jean-Michel GérardORCiD, Hubert PerrotORCiD, Ozlem Sel, David AradillaORCiD
Parent Title (English):Nanomaterials
First Page:2451
Year of first Publication:2020
Release Date:2022/11/18
Tag:EQCM; ac-electrogravimetry; electrolyte; energy storage mechanisms; graphene; ionic liquids; supercapacitors
Impact:05.076 (2020)
Funding Information:ANR under reference ANR-11-IDEX-0004-02, the Cluster of Excellence LABEX MATISSE led by Sorbonne Université and CEA-Grenoble (France).
Open Access:Open Access
Signature:INM 2020/150
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International