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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Highly stable nickel-aluminum alloy current collectors and highly defective multi-walled carbon nanotubes active material for neutral aqueous-based electrochemical capacitors

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Vicentini, Rafael [1] ; Nunes, Willian G. [1] ; Costa, Lenon H. [1] ; Da Silva, Leonardo M. [2] ; Pascon, Aline [1] ; Jackson, Paloma [1] ; Doubek, Gustavo [3] ; Zanin, Hudson [1]
Total Authors: 8
[1] Univ Estadual Campinas, Adv Energy Storage Div, Ctr Innovat New Energies, Carbon Sci Tech Labs, Sch Elect & Comp Engn, Ave Albert Einstein 400, BR-13083852 Campinas, SP - Brazil
[2] Fed Univ Jequitinhonha & Mucuris Valley, Dept Chem, Highway MGT 367, Km 583, 5000 Alto Jacuba 39, BR-100000 Diamantina, MG - Brazil
[3] Univ Estadual Campinas, Adv Energy Storage Div, Ctr Innovat New Energies, Sch Chem Engn, Lab Adv Batteries, Ave Albert Einstein 500, BR-13083852 Campinas, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: JOURNAL OF ENERGY STORAGE; v. 23, p. 116-127, JUN 2019.
Web of Science Citations: 2

Neutral aqueous electrolytes are known to promote corrosion of carbon coated aluminum current collectors used in electrochemical capacitors, limiting their applications on energy storage devices. Alternatively to the standard electrode manufacturing recipe, we have grown multi-walled carbon nanotubes as the active material on modified aluminum foils to avoid the corrosion of the latter in neutral aqueous solutions. Therefore, the purpose of the present study is the fabrication of a binary alloy that is resistant to corrosion in neutral aqueous solutions. In this sense, we modified standard aluminum foil current collectors by coating them with a thin nickel layer, which was converted on nickel-aluminum alloy (NixAl, x = 1 \& x = 3) during the first heating steps of nanotubes growth on the current collector. This novel aluminum modified current collector is electrically conductive and very resistant to corrosion, which allows applying aluminum-based current collectors on aqueous-based electrochemical capacitors devices. To better investigate the electrochemical performance of carbon-based electrodes in aqueous filled coin cell devices, we performed several electrochemical studies using cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopy. Our results show specific electrode capacitance is up to similar to 60 F g(-1). After 85,000 (re)charge/discharge cycles, the cell operating on 0-1.5 V voltage range, indicate very long lifespan with no significant loss of specific capacitance and energy density. These results are unexpected for aluminum current collectors on supercapacitor or batteries. On the Ragone plot, our aqueous-based electrochemical capacitor is on supercapacitors region with fairly high power and energy densities. (AU)

FAPESP's process: 17/11958-1 - Advanced energy storage division
Grantee:Rubens Maciel Filho
Support type: Research Grants - Research Centers in Engineering Program
FAPESP's process: 17/19222-4 - Development of storage and supplier device of electric power and methodology of dynamic analysis in operation mode
Grantee:Lenon Henrique da Costa
Support type: Scholarships in Brazil - Doctorate (Direct)
FAPESP's process: 14/02163-7 - Development of supercapacitors devices from graphene, carbon nanotubes and diamonds
Grantee:Hudson Giovani Zanin
Support type: Research Grants - Young Investigators Grants
FAPESP's process: 16/25082-8 - Development of prototype of energy storer and supplier
Grantee:Lenon Henrique da Costa
Support type: Scholarships in Brazil - Master