| Full text | |
| Author(s): |
Real, Carla G.
[1]
;
Vicentini, Rafael
[1]
;
Nunes, Willian G.
[1]
;
Pascon, Aline M.
[1]
;
Campos, Feik Amil
[2, 3]
;
Da Silva, Leonardo M.
[4]
;
Freitas, Renato Garcia
[2, 3]
;
Zanin, Hudson
[1]
Total Authors: 8
|
| Affiliation: | [1] Univ Estadual Campinas, Ctr Innovat New Energies, Sch Elect & Comp Engn, Adv Energy Storage Div, Carbon Sci Tech Labs, Av Albert Einstein 400, BR-13083852 Campinas, SP - Brazil
[2] Univ Fed Mato Grosso, Inst Phys, ICET UFMT, BR-78060900 Cuiaba, MT - Brazil
[3] Univ Fed Mato Grosso, ICET UFMT, Lab Computat Mat, Dept Chem, BR-78060900 Cuiaba, MT - Brazil
[4] Fed Univ Jequitinhonha & Mucuris Valley, Lab Fundamental & Appl Electrochem, Dept Chem, Rodovia MGT 367, Km 583, 5000 Alto Jacuba, BR-39100000 Diamantina, MG - Brazil
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | Electrochimica Acta; v. 402, JAN 10 2022. |
| Web of Science Citations: | 0 |
| Abstract | |
A novel and scalable method is reported to produce flexible and freestanding fabrics composed of high surface area activated carbon nanofibers (aCNF) for applications in supercapacitors. The electrochemical behavior of a symmetric supercapacitor using the aCNF electrodes and the operando Raman spectra study accomplished under polarization conditions are reported. The evolution of Raman spectra during polarization supported the aCNF stability and suggested the insertion of the HSO4- ions in carbon micropores. These findings evidenced a new symmetry at the aCNF/electrolyte interface, where electronic and ionic charges accumulate. The distributed capacitance in the time domain was studied by numeric differentiation of galvanostatic charge-discharge findings. The impedance behavior of the solid and liquid phases composing the aCNF/solution interface was modeled using a macro homogeneous description of two closely mixed phases represented by a single-channel transmission line incorporating the anomalous transport of the ionic charges in the disordered structure of aCNF. Electrochemical findings revealed outstanding charge-storage properties in neutral aqueous electrolyte resulting in long lifespan, low equivalent series resistance (12 m Omega g), high coulombic efficiency (similar to 99.8 %), a maximum distributed capacitance of 82 F g(-1) (0.25 A g(-1) -1.1 V), maximum specific energy and power of 2.98 W h kg(-1) and 72,672 W kg(-1), respectively. (C) 2021 Published by Elsevier Ltd. (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 |