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Unveiling the ionic exchange mechanisms in vertically-oriented graphene nanosheet supercapacitor electrodes with electrochemical quartz crystal microbalance and ac -electrogravimetry

Tao Le 1, 2 David Aradilla 2, * Gérard Bidan 2 Florence Billon 1 Marc Delaunay 3 Jean-Michel Gérard 3 Hubert Perrot 1 Ozlem Sel 1, *
* Corresponding author
2 STEP - Synthèse, Structure et Propriétés de Matériaux Fonctionnels
SYMMES - SYstèmes Moléculaires et nanoMatériaux pour l’Energie et la Santé : DRF/IRIG/SYMMES
3 NPSC - Nanophysique et Semiconducteurs
PHELIQS - PHotonique, ELectronique et Ingénierie QuantiqueS : DRF/IRIG/PHELIQS
Abstract : This work presents the first electrochemical quartz crystal microbalance (EQCM) results for vertically-oriented graphene nanosheets (VOGNs) as supercapacitor electrodes. Conventional EQCM technique delivered primary insights on the ionic exchange mechanisms between VOGNs and organic electrolytes, showing a major contribution of anions. A more advanced electrogravimetric methodology, ac-electrogravimetry, was then used to access specific dynamic attributes for each species exchanged at the VOGN electrode surface. Accordingly, under the conditions of this study, anions were confirmed to be the major energy storage vector with high kinetic values and low transfer resistance while cations and free solvent molecules are given non-negligible supporting roles.
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Submitted on : Wednesday, July 11, 2018 - 11:09:12 AM
Last modification on : Thursday, November 26, 2020 - 3:26:10 PM
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Tao Le, David Aradilla, Gérard Bidan, Florence Billon, Marc Delaunay, et al.. Unveiling the ionic exchange mechanisms in vertically-oriented graphene nanosheet supercapacitor electrodes with electrochemical quartz crystal microbalance and ac -electrogravimetry. Electrochemistry Communications, Elsevier, 2018, 93, pp.5-9. ⟨10.1016/j.elecom.2018.05.024⟩. ⟨hal-01835144⟩

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