Ali, Gomaa A. M. and Megiel, Elzbieta and Romański, Jan and Algarni, H. and K. F., Chong (2018) A wide potential window symmetric supercapacitor by TEMPO functionalized MWCNTs. Journal of Molecular Liquids, 271. pp. 31-39. ISSN 0167-7322. (Published)
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Abstract
In this paper, we report a simple and effective method to functionalize industrial-grade multi-walled carbon nanotubes (MWCNTs) with 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO), via oxidation of MWCNTS and followed by carbodiimide coupling of amino-TEMPO. The effective coupling is confirmed and studied by EPR, HRTEM, BET, XPS, FTIR, TGA and XRD techniques. Electrochemical studies reveal the capacitive enhancement of MWCNTs-TEMPO, where MWCNTs-TEMPO shows capacitance value (66 F g−1 at 0.25 A g−1) that is 5-times higher than that of industrial grade MWCNTs (13.5 F g−1 at 0.25 A g−1). This can be due to the reversible redox reaction of nitroxide radicals on TEMPO that contributes to pseudocapacitance. A symmetrical supercapacitor is assembled with MWCNTs-TEMPO as electrode material and optimized with wide operating voltage (2 V) to produce high energy density of 26.6 Wh kg−1 with high stability (90% capacitance retention over 4000 cycles). The findings propose a facile approach to modify industrial grade MWCNTs as the electrode materials in supercapacitors.
| Item Type: | Article |
|---|---|
| Additional Information: | Indexed by SCOPUS |
| Uncontrolled Keywords: | MWCNTs; Functionalization; Nitroxides; TEMPO; Supercapacitance |
| Subjects: | Q Science > Q Science (General) |
| Faculty/Division: | Faculty of Industrial Sciences And Technology |
| Depositing User: | Noorul Farina Arifin |
| Date Deposited: | 20 Sep 2018 08:31 |
| Last Modified: | 06 Mar 2019 02:42 |
| URI: | http://umpir.ump.edu.my/id/eprint/22159 |
| Download Statistic: | View Download Statistics |
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