| Full text | |
| Author(s): |
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
Total Authors: 8
|
| Document type: | Journal article |
| Source: | Electrochimica Acta; v. 535, p. 13-pg., 2025-09-20. |
| Abstract | |
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) | |
| FAPESP's process: | 22/11983-4 - Spectroscopy signal enhancement: nanomaterials, theory, and computer simulation |
| Grantee: | Mauro Carlos Costa Ribeiro |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 17/11958-1 - CINE - Advanced Energy Storage Division |
| Grantee: | Rubens Maciel Filho |
| Support Opportunities: | Research Grants - Research Centers in Engineering Program |
| FAPESP's process: | 19/18125-0 - Computational study of materials with application in energy storage |
| Grantee: | Leonardo José Amaral de Siqueira |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 17/11986-5 - Generation and storage of New Energy: bringing technological development for the country |
| Grantee: | Ana Flávia Nogueira |
| Support Opportunities: | Research Grants - Research Centers in Engineering Program |
| FAPESP's process: | 14/02163-7 - Development of supercapacitors devices from graphene, carbon nanotubes and diamonds |
| Grantee: | Hudson Giovani Zanin |
| Support Opportunities: | Research Grants - Young Investigators Grants |