To reach a deeper understanding of the charge storage mechanisms of electrode materials is one of the challenges toward improving their energy storage performance. Herein, we investigate the interfacial ion exchange of a composite electrode made of carbon nanotube/poly(ortho-phenylenediamine) (CNT/PoPD) in a 1M NaCl aqueous electrolyte via advanced electrogravimetric analyses based on electrochemical quartz crystal microbalance (EQCM). Classical EQCM at different scan rates of the potential revealed the complex electrogravimetric behavior likely due to multi-species participation at different temporal scales. Thereafter, in order to better understand the behavior of each species (ions, counter ions, and co-ions) in the charge compensation mechanism, the electrogravimetric impedance spectroscopy analysis (also called ac-electrogravimetry) was pursued. Ac-electrogravimetry revealed the role of each species where Na+ cations and Cl− anions as well as protons participate in the charge compensation mechanism of the CNT/PoPD composite with different kinetics and proportions. The water molecules with opposite flux direction with the cations are also detected, suggesting their exclusion during cationic species transfer. Having analyzed ac-electrogravimetry responses in depth, the synergistic interaction between the CNT and PoPD is highlighted, revealing the improved accessibility of species to new sites in the composite.
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28 March 2022
Research Article|
March 22 2022
Interfacial charge storage mechanisms of composite electrodes based on poly(ortho-phenylenediamine)/carbon nanotubes via advanced electrogravimetry
Special Collection:
The Chemical Physics of the Electrode-Electrolyte Interface
El Mahdi Halim
;
El Mahdi Halim
1
Sorbonne Université, CNRS, Laboratoire Interfaces et Systèmes Electrochimiques, LISE
, LISE UMR 8235, 75005 Paris, France
2
Laboratory of Materials, Membranes and Environment, Faculty of Sciences and Technology, University of Hassan II of Casablanca
, BP 146, 20650 Mohammedia, Morocco
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Rezan Demir-Cakan
;
Rezan Demir-Cakan
3
Institute of Nanotechnology, Gebze Technical University
, 41400 Gebze, Kocaeli, Turkey
4
Department of Chemical Engineering, Gebze Technical University
, 41400 Gebze, Kocaeli, Turkey
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Hubert Perrot
;
Hubert Perrot
1
Sorbonne Université, CNRS, Laboratoire Interfaces et Systèmes Electrochimiques, LISE
, LISE UMR 8235, 75005 Paris, France
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Mama El Rhazi;
Mama El Rhazi
2
Laboratory of Materials, Membranes and Environment, Faculty of Sciences and Technology, University of Hassan II of Casablanca
, BP 146, 20650 Mohammedia, Morocco
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Ozlem Sel
Ozlem Sel
a)
1
Sorbonne Université, CNRS, Laboratoire Interfaces et Systèmes Electrochimiques, LISE
, LISE UMR 8235, 75005 Paris, France
5
Chimie du Solide et de l’Energie, UMR 8260, Collège de France
, 11 Place Marcelin Berthelot, 75231 Cedex 05 Paris, France
a)Author to whom correspondence should be addressed: [email protected]
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a)Author to whom correspondence should be addressed: [email protected]
Note: This paper is part of the JCP Special Topic on The Chemical Physics of the Electrode–Electrolyte Interface.
J. Chem. Phys. 156, 124703 (2022)
Article history
Received:
December 05 2021
Accepted:
March 01 2022
Citation
El Mahdi Halim, Rezan Demir-Cakan, Hubert Perrot, Mama El Rhazi, Ozlem Sel; Interfacial charge storage mechanisms of composite electrodes based on poly(ortho-phenylenediamine)/carbon nanotubes via advanced electrogravimetry. J. Chem. Phys. 28 March 2022; 156 (12): 124703. https://doi.org/10.1063/5.0080944
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