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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.)

Highly stable nickel-aluminum alloy current collectors and highly defective multi-walled carbon nanotubes active material for neutral aqueous-based electrochemical capacitors

Texto completo
Autor(es):
Vicentini, Rafael [1] ; Nunes, Willian G. [1] ; Costa, Lenon H. [1] ; Da Silva, Leonardo M. [2] ; Pascon, Aline [1] ; Jackson, Paloma [1] ; Doubek, Gustavo [3] ; Zanin, Hudson [1]
Número total de Autores: 8
Afiliação do(s) autor(es):
[1] Univ Estadual Campinas, Adv Energy Storage Div, Ctr Innovat New Energies, Carbon Sci Tech Labs, Sch Elect & Comp Engn, Ave Albert Einstein 400, BR-13083852 Campinas, SP - Brazil
[2] Fed Univ Jequitinhonha & Mucuris Valley, Dept Chem, Highway MGT 367, Km 583, 5000 Alto Jacuba 39, BR-100000 Diamantina, MG - Brazil
[3] Univ Estadual Campinas, Adv Energy Storage Div, Ctr Innovat New Energies, Sch Chem Engn, Lab Adv Batteries, Ave Albert Einstein 500, BR-13083852 Campinas, SP - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: JOURNAL OF ENERGY STORAGE; v. 23, p. 116-127, JUN 2019.
Citações Web of Science: 2
Resumo

Neutral aqueous electrolytes are known to promote corrosion of carbon coated aluminum current collectors used in electrochemical capacitors, limiting their applications on energy storage devices. Alternatively to the standard electrode manufacturing recipe, we have grown multi-walled carbon nanotubes as the active material on modified aluminum foils to avoid the corrosion of the latter in neutral aqueous solutions. Therefore, the purpose of the present study is the fabrication of a binary alloy that is resistant to corrosion in neutral aqueous solutions. In this sense, we modified standard aluminum foil current collectors by coating them with a thin nickel layer, which was converted on nickel-aluminum alloy (NixAl, x = 1 \& x = 3) during the first heating steps of nanotubes growth on the current collector. This novel aluminum modified current collector is electrically conductive and very resistant to corrosion, which allows applying aluminum-based current collectors on aqueous-based electrochemical capacitors devices. To better investigate the electrochemical performance of carbon-based electrodes in aqueous filled coin cell devices, we performed several electrochemical studies using cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopy. Our results show specific electrode capacitance is up to similar to 60 F g(-1). After 85,000 (re)charge/discharge cycles, the cell operating on 0-1.5 V voltage range, indicate very long lifespan with no significant loss of specific capacitance and energy density. These results are unexpected for aluminum current collectors on supercapacitor or batteries. On the Ragone plot, our aqueous-based electrochemical capacitor is on supercapacitors region with fairly high power and energy densities. (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: 17/19222-4 - Desenvolvimento de dispositivo armazenador e fornecedor de energia elétrica e metodologia de análise dinâmica em modo de operação
Beneficiário:Lenon Henrique da Costa
Linha de fomento: Bolsas no Brasil - Doutorado Direto
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: 16/25082-8 - Desenvolvimento de protótipo armazenador e fornecedor de energia
Beneficiário:Lenon Henrique da Costa
Linha de fomento: Bolsas no Brasil - Mestrado