| Texto completo | |
| Autor(es): |
Venancio, Raissa
;
da Silva, Debora A. C.
;
Borges, Ludmila O.
;
Silva, Isabel A.
;
Da Silva, Leonardo Morais
;
Doubek, Gustavo
;
Siqueira, Leonardo J. A.
;
Zanin, Hudson
Número total de Autores: 8
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Electrochimica Acta; v. 535, p. 13-pg., 2025-09-20. |
| Resumo | |
This study characterizes the electrochemical behavior of symmetric coin cells with AC-based electrodes filled with the ammonium-based ionic liquid, a promising supercapacitor electrolyte due to its large voltage window and ambient temperature operation. We employed cyclic voltammetry, single-step chronoamperometry, electrochemical impedance spectroscopy, and galvanostatic charge-discharge techniques to evaluate the electrochemical performance of the supercapacitors thoroughly. Our findings highlight the quasi-rectangular current-voltage profile up to 3.6 V, beyond which a faradaic current due to electrolyte degradation becomes significant. These results revealed a minor faradaic component, with impedance analysis showing typical behavior of well-formed electrical double layers (EDLs), influenced by the unique properties of ionic liquids. We observed that the ion dynamics and capacitance behavior align well with theoretical models, particularly the Goodwin-Kornishev mean-field theory. The study underscores the potential of ionic liquid-based supercapacitors to achieve high performance, with specific capacitance values reaching similar to 2000 F g(-1) and great energy and power output, comparable to lithium-ion batteries. Molecular dynamics simulations further elucidated the charging mechanisms, ion migration, and structural interactions within the EDLs. These comprehensive insights validate the suitability of butyltrimethylammonium bis(trifluoromethylsulfonyl)imide [N-1114][NTf2] for advanced supercapacitor applications, highlighting its ability to deliver exceptional electrochemical performance under optimized conditions. (AU) | |
| Processo FAPESP: | 22/11983-4 - Espectroscopias com intensificação de sinal: nanomateriais, teoria e simulação computacional |
| Beneficiário: | Mauro Carlos Costa Ribeiro |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| 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: | 19/18125-0 - Estudo computacional de materiais com aplicação em armazenamento de energia |
| Beneficiário: | Leonardo José Amaral de Siqueira |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 17/11986-5 - Geração e Armazenamento de Novas Energias: trazendo desenvolvimento tecnológico para o país |
| Beneficiário: | Ana Flávia Nogueira |
| Modalidade de apoio: | 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 |
| Modalidade de apoio: | Auxílio à Pesquisa - Jovens Pesquisadores |