| Texto completo | |
| Autor(es): |
Santos, Joao Pedro A.
;
Pinzon, Manuel J.
;
Santos, Erick A.
;
Vicentini, Rafael
;
Pagan, Cesar J. B.
;
Da Silva, Leonardo M.
;
Zanin, Hudson
Número total de Autores: 7
|
| Tipo de documento: | Artigo Científico |
| Fonte: | JOURNAL OF ENERGY CHEMISTRY; v. 70, p. 10-pg., 2022-07-01. |
| Resumo | |
Supercapacitors (SCs) are high-power energy storage devices with ultra-fast charge/discharge properties. SCs using concentrated aqueous-based electrolytes can work at low temperatures due to their intrinsic properties, such as higher freezing point depression (FPD) and robustness. Besides the traditional organic-and aqueous-based (salt-in-water) electrolytes used in SCs, water-in-salt (WISE) sodium per-chlorate electrolytes offer high FPD, non-flammability, and low-toxicity conditions, allowing the fabrication of safer, environmentally friendly, and more robust devices. For the first time, this work reports a comprehensive study regarding WISE system's charge-storage capabilities and physicochemical proper-ties under low-temperature conditions (T < 0 degrees C) using mesoporous carbon-based electrodes. The effect of temperature reduction on the electrolyte viscosity and electrical properties was investigated using differ-ent techniques and the in-situ (or operando) Raman spectroscopy under dynamic polarization conditions. The cell voltage, equivalent series resistance, and specific capacitance were investigated as a function of the temperature. The cell voltage (U) increased similar to 50%, while the specific capacitance decreased -20% when the temperature was reduced from 25 degrees C to -10 degrees C. As a result, the maximum specific energy (E = CU2/2) increased similar to 100%. Therefore, low-temperature WISEs are promising candidates to improve the energy-storage characteristics in SCs. (C) 2022 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved. (AU) | |
| 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 |