Multi-walled carbon nanotubes and activated carbon composite material as electrodes for electrochemical capacitors

Autor(es)

Vicentini, Rafael ^[1] ; Nunes, Willian G. ^[1] ; da Costa, Lenon H. ^[1] ; Da Silva, Leonardo M. ^[2] ; Freitas, Bruno ^[1] ; Pascon, Aline M. ^[1] ; Vilas-Boas, Otavio ^[1] ; Zanin, Hudson ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Ctr Innovat New Energies, Sch Elect & Comp Engn, Carbon Sci Tech Labs, Adv Energy Storage Div, Av Albert Einstein 400, BR-13083852 Campinas, SP - Brazil

^[2] Fed Univ Jequitinhonha & Mucuris Valley, Dept Chem, Highway MGT 367, Km 583, 5000 Alto Jacuba, BR-39100000 Diamantina, MG - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ENERGY STORAGE; v. 33, JAN 2021.
• Citações Web of Science: 2

Resumo

We report on novel multi-walled carbon nanotubes (MWCNTs) and activated carbon (AC) composite material as electrode for electrochemical capacitors (ECs). Here MWCNTs work simultaneously as binder and additive for AC electrodes. MWCNTs were synthesised directly onto AC placed on nickel coated aluminium foils binding all of them. During MWCNT synthesis, nickel coated aluminium foils were converted on nickel aluminide alloy, which is extremely stable in neutral aqueous media and also permit welding in the case of large devices manufacturing or association. This novel material brings two significant features to ECs devices: (i) very low equivalent series resistance, and (ii) operational stability in aqueous based electrolytes. That is an excellent opportunity to explore because nonaqueous electrolytes itself and its handling to keep them humidity-free are ones of the most expensive part of ECs manufacturing. Replacing them using a better cog-effective and environmentally friendly electrolyte is desirable. Our approach is simple, fast, very reproducible, and low cost and in the end of the day devices showed large cell voltage of 1.5 V in aqueous electrolyte with specific capacitance of electrode material up to 105 F g(-1) (e.g. very similar to several reports on literature using standard binders). Our cyclability test suggested a long service life with no significative lost on capacitance retention after 70 thousand cycles using a voltage range of 1.5 V at 25 A g(-1). A detailed electrochemical analysis of device is also presented. On the Ragone plot, our devices fit between Li-ion capacitor and electrochemical capacitors. (AU)

• Processo FAPESP: 16/25082-8 - Desenvolvimento de protótipo armazenador e fornecedor de energia
• Beneficiário: Lenon Henrique da Costa
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• 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
• Processo FAPESP: 17/03640-1 - Desenvolvimento de protótipo de potente armazenador e fornecedor de energia
• Beneficiário: Otavio Cristiano Vilas Boas
• Modalidade de apoio: Bolsas no Brasil - Mestrado