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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Study of the aging process of nanostructured porous carbon-based electrodes in electrochemical capacitors filled with aqueous or organic electrolytes

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Nunes, Willian G. [1] ; Pires, Bruno M. [1] ; De Oliveira, Francisca E. R. [1] ; de Marque, Aline M. P. [1] ; Cremasco, Leticia F. [2] ; Vicentini, Rafael [1] ; Doubek, Gustavo [2] ; Da Silva, Leonardo M. [3] ; Zanin, Hudson [1]
Total Authors: 9
[1] Univ Estadual Campinas, Sch Elect & Comp Engn, Ctr Innovat New Energies, Adv Energy Storage Div, Carbon Sci Tech Labs, Av Albert Einstein 400, Campinas 13083852, SP - Brazil
[2] Univ Estadual Campinas, Sch Chem Engn, Lab Adv Batteries, Adv Energy Storage Div, Ctr Innovat New Energies, Av Albert Einstein 500, Campinas 13083852, SP - Brazil
[3] Fed Univ Jequitinhonha & Mucuris Valley, Dept Chem, Lab Fundamental & Appl Electrochem, Rodovia MGT 367, Km 583, 5000 Alto Jacuba, Diamantina 39100000, MG - Brazil
Total Affiliations: 3
Document type: Journal article
Web of Science Citations: 1

We report in this work the surface chemistry and the electrochemical studies on electrodes composed of randomly oriented multi-walled carbon nanotubes supported on stainless-steel (AISI:ROMWCNTs) confined in symmetric coin cells, before and after the electrode aging process accomplished in aqueous and organic electrolytes. We contrasted features from the as-grown and aged electrodes obtained during the different electrochemical experiments using cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy techniques. Also, several studies involving the Raman, Fourier transform infrared, and X-ray photoelectron spectroscopy, and the scanning electron microscopy techniques were carried out. Our experimental findings indicated that the electrode material shows fair good stability during the charge-discharge processes carried out using the different electrolytes. The aging process observed for each electrolyte revealed the formation of reaction by-products during the long-term charge-storage endurance tests. We additionally performed the in situ (operando) Raman characterization study of the electrodes under dynamic polarization conditions. In this sense, we verified the reversible Raman shifts (e.g., G \& D bands) accounting for the dynamic nature of the charge accumulation-depletion processes occurring inside the electrical double-layer structure. (AU)

FAPESP's process: 17/11958-1 - Advanced energy storage division
Grantee:Rubens Maciel Filho
Support type: Research Grants - Research Centers in Engineering Program
FAPESP's process: 14/02163-7 - Development of supercapacitors devices from graphene, carbon nanotubes and diamonds
Grantee:Hudson Giovani Zanin
Support type: Research Grants - Young Investigators Grants
FAPESP's process: 18/20756-6 - Pseudocapacitors from metal oxides and activated carbon composites
Grantee:Willian Gonçalves Nunes
Support type: Scholarships in Brazil - Doctorate