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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.)

Robust, flexible, freestanding and high surface area activated carbon and multi-walled carbon nanotubes composite material with outstanding electrode properties for aqueous-based supercapacitors

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Autor(es):
Freitas, Bruno [1] ; Nunes, Willian G. [1] ; Soares, Davi Marcelo [1] ; Rufino, Fernando C. [1] ; Moreira, Cassio Murilo [2] ; Da Silva, Leonardo Morais [2] ; Zanin, Hudson [1]
Número total de Autores: 7
Afiliação do(s) autor(es):
[1] Univ Estadual Campinas, Sch Elect & Comp Engn, Adv Energy Storage Div, Ctr Innovat New Energies, Carbon Sci Tech Labs & M, Av Albert Einstein 400, BR-13083852 Campinas, SP - Brazil
[2] Fed Univ Jequitinhonha & Mucuris Valley, Dept Chem, Lab Fundamental & Appl Electrochem, Rodovia MGT 367, Km 583, 5000 Alto Jacuba, BR-39100000 Diamantina, MG - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: MATERIALS ADVANCES; MAR 2021.
Citações Web of Science: 0
Resumo

We report on multi-walled carbon nanotubes (MWCNTs) and an activated carbon (AC) composite material as an electrode for electrical double-layer capacitors (EDLCs). Material flexibility, robustness, and electrical conductivity are features that come from the MWCNTs, while a high specific surface area is an AC's intrinsic property. We prepared different MWCNT : AC ratios in solutions, which were filtered to form a buckypaper. We investigated the specific capacitance, equivalent series resistance, working voltage window (WVW), and the specific energy and power. The best electrochemical findings were obtained for the MWCNT : AC ratio of 1 : 3 with a specific capacitance reaching the theoretical limit. A high working voltage window of 1.4 V was verified in aqueous solution. Simultaneously, the symmetric cells were able to cycle for more than one million cycles in fast charge-discharge galvanostatic tests with 93% capacitance retention. Finally, the main criticism regarding the self-supported electrode materials is the difficulty of welding. In this sense, we presented a particular welding process as proof of concept for electrode scalability. Overall, this novel electrode material exhibits a set of exciting properties, which we now tested in EDLCs. (AU)

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
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