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

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]

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

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