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Communication Dans Un Congrès Année : 2018

Unveiling the Ionic Exchange Mechanisms in Vertical Graphene Nanosheet Supercapacitor Electrodes by Using AC-Electrogravimetry

Résumé

Vertically oriented graphene nanosheets (VOGNs) have recently shown a great potential as electrodes for electrochemical double layer capacitors due to their peculiar characteristics such as high conductivity, ion access facility and open structure with high surface area [1, 2]. This work presents, for the first time, the electrochemical quartz crystal microbalance (EQCM) results obtained on VOGNs using various organic electrolytes. The measurements were performed on VOGNs grown on goldpatterned GaPO4 piezoelectric resonator electrodes according to our previous experimental conditions (Fig. 1a) [2]. In this direction, EQCM measurements provide fruitful insights derived from mass variations concerning the behavior of ions upon cycling (Fig. 1b). A more advanced electrogravimetric technique, acelectrogravimetry, combines electrochemical impedance spectroscopy with mass measurements to obtain specific dynamic attributes for each species exchanged at the electrode surface (Fig. 1c). This unique technique was used on VOGNs to attain the deconvolution of the global EQCM outcome into individual dynamic responses for each species exchanged at the electrode-electrolyte interface [3]. Depending on the nature of cations and anions, the energy storage mechanism was driven by different species from the electrolyte. The fundamental insight obtained in this study paves the way to better understand the supercapacitor’s key mechanisms for energy storage, which is crucial for further developing new electrode designs. References [1] Z. Bo, S. Mao, Z.J. Han, K. Cen, J. Chen, K.K. Ostrikov, Chem. Soc. Rev. 2015, 44, 2108–2121. [2] D. Aradilla, M. Delaunay, S. Sadki, J.M. Gérard, G. Bidan, J. Mater. Chem. A. 2015, 3, 19254–19262. [3] H. Goubaa, F. Escobar-Teran, I. Ressam, W. Gao, A.E. Kadib, I.T. Lucas, M. Raihane, M. Lahcini, H. Perrot, O. Sel, J. Phys. Chem. C. 2017, 121, 9370–9380.

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hal-03976784 , version 1 (07-02-2023)

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  • HAL Id : hal-03976784 , version 1

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Tao Lé, David Aradilla, Gérard Bidan, Florence Billon, M. Delaunay, et al.. Unveiling the Ionic Exchange Mechanisms in Vertical Graphene Nanosheet Supercapacitor Electrodes by Using AC-Electrogravimetry. ElecNano 8, Société Chimique de France (SCF), May 2018, Nancy, France. ⟨hal-03976784⟩
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