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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

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

Texto completo
Autor(es):
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]
Número total de Autores: 9
Afiliação do(s) autor(es):
[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
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: JOURNAL OF ENERGY STORAGE; v. 28, APR 2020.
Citações Web of Science: 1
Resumo

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)

Processo FAPESP: 17/11958-1 - Divisão para armazenamento de energia avançado
Beneficiário:Rubens Maciel Filho
Linha de fomento: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia
Processo FAPESP: 14/02163-7 - Desenvolvimento de dispositivos supercapacitores a partir de grafenos, nanotubos de carbono e diamantes
Beneficiário:Hudson Giovani Zanin
Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores
Processo FAPESP: 18/20756-6 - Desenvolvimento de pseudocapacitores a partir de compósitos de óxidos metálicos e carvão ativado
Beneficiário:Willian Gonçalves Nunes
Linha de fomento: Bolsas no Brasil - Doutorado