| Full text | |
| Author(s): |
Nunes, Willian G.
[1]
;
Pires, Bruno M.
[1]
;
De Oliveira, Francisca E. R.
[1]
;
de Marque, Aline M. P.
[1]
;
Cremasco, Leticia F.
[2]
;
Vicentini, Rafael
[1]
;
Doubek, Gustavo
[2]
;
Da Silva, Leonardo M.
[3]
;
Zanin, Hudson
[1]
Total Authors: 9
|
| Affiliation: | [1] Univ Estadual Campinas, Sch Elect & Comp Engn, Ctr Innovat New Energies, Adv Energy Storage Div, Carbon Sci Tech Labs, Av Albert Einstein 400, Campinas 13083852, SP - Brazil
[2] Univ Estadual Campinas, Sch Chem Engn, Lab Adv Batteries, Adv Energy Storage Div, Ctr Innovat New Energies, Av Albert Einstein 500, Campinas 13083852, SP - Brazil
[3] Fed Univ Jequitinhonha & Mucuris Valley, Dept Chem, Lab Fundamental & Appl Electrochem, Rodovia MGT 367, Km 583, 5000 Alto Jacuba, Diamantina 39100000, MG - Brazil
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | JOURNAL OF ENERGY STORAGE; v. 28, APR 2020. |
| Web of Science Citations: | 1 |
| Abstract | |
We report in this work the surface chemistry and the electrochemical studies on electrodes composed of randomly oriented multi-walled carbon nanotubes supported on stainless-steel (AISI:ROMWCNTs) confined in symmetric coin cells, before and after the electrode aging process accomplished in aqueous and organic electrolytes. We contrasted features from the as-grown and aged electrodes obtained during the different electrochemical experiments using cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy techniques. Also, several studies involving the Raman, Fourier transform infrared, and X-ray photoelectron spectroscopy, and the scanning electron microscopy techniques were carried out. Our experimental findings indicated that the electrode material shows fair good stability during the charge-discharge processes carried out using the different electrolytes. The aging process observed for each electrolyte revealed the formation of reaction by-products during the long-term charge-storage endurance tests. We additionally performed the in situ (operando) Raman characterization study of the electrodes under dynamic polarization conditions. In this sense, we verified the reversible Raman shifts (e.g., G \& D bands) accounting for the dynamic nature of the charge accumulation-depletion processes occurring inside the electrical double-layer structure. (AU) | |
| 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 |
| FAPESP's process: | 17/11958-1 - CINE - Advanced Energy Storage Division |
| Grantee: | Rubens Maciel Filho |
| Support Opportunities: | Research Grants - Research Centers in Engineering Program |