| Full text | |
| Author(s): |
dos Santos, Joao Pedro Aguiar
;
Pagan, Cesar J. B.
;
Vicentini, Rafael
;
Teofilo, Reinaldo F.
;
Beraldo, Renato
;
Da Silva, Leonardo M.
;
Zanin, Hudson
Total Authors: 7
|
| Document type: | Journal article |
| Source: | JOURNAL OF ENERGY CHEMISTRY; v. 80, p. 10-pg., 2023-02-17. |
| Abstract | |
Compressing supercapacitor (SCs) electrode is essential for improving the energy storage characteristics and minimizing ions' distance travel, faradaic reactions, and overall ohmic resistance. Studies comprising the ion dynamics in SC electrodes under compression are still rare. So, the ionic dynamics of five aqueous electrolytes in electrodes under compression were studied in this work for tracking electrochemical and structural changes under mechanical stress. A superionic state is formed when the electrode is com-pressed until the micropores match the dimensions with the electrolyte's hydrated ion sizes, which increases the capacitance. If excessive compression is applied, the accessible pore regions decrease, and the capacitance drops. Hence, as the studied hydrated ions have different dimensions, the match between ion/pore sizes differs. To the LiOH and NaClO4 electrolytes, increasing the pressure from 60 to 120 and 100 PSI raised the capacitance from 13.5 to 35.2 F g-1 and 30.9 to 39.0 F g-1, respectively. So, the KOH electrolyte with the lowest and LiCl with the biggest combination of hydrated ion size have their point of maximum capacitance (39.5 and 36.7F g-1) achieved at 140 and 80 PSI, respectively. To LiCl and KCl electrolytes, overcompression causes a drop in capacitance higher than 23%.(c) 2023 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved. (AU) | |
| 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: | 18/20756-6 - Pseudocapacitors from metal oxides and activated carbon composites |
| Grantee: | Willian Gonçalves Nunes |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| 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 |