SUPERCAPACITORS ENGINEERING: MAXIMIZING EFFICIENCY IN ELECTROCHEMICAL ENERGY STORAGE
Study of printed supercapacitors integrating electrolyte-gated transistors
Polarizable force fields for the Investigation of sodium-ion battery materials
| Full text | |
| Author(s): |
Santos, Joao Pedro A.
;
Pinzon, Manuel J.
;
Santos, Erick A.
;
Vicentini, Rafael
;
Pagan, Cesar J. B.
;
Da Silva, Leonardo M.
;
Zanin, Hudson
Total Authors: 7
|
| Document type: | Journal article |
| Source: | JOURNAL OF ENERGY CHEMISTRY; v. 70, p. 10-pg., 2022-07-01. |
| Abstract | |
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) | |
| 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 |
| FAPESP's process: | 17/11958-1 - CINE - Advanced Energy Storage Division |
| Grantee: | Rubens Maciel Filho |
| Support Opportunities: | Research Grants - Research Centers in Engineering Program |