A wide potential window symmetric supercapacitor by TEMPO functionalized MWCNTs

• Main Authors: Ali, Gomaa A. M., Megiel, Elzbieta, Romański, Jan, Algarni, H., K. F., Chong
• Format: Article
• Language: English
• Published: Elsevier 2018
• Subjects: Q Science (General)
• Online Access: http://umpir.ump.edu.my/id/eprint/22159/1/A%20wide%20potential%20window%20symmetric%20supercapacitor%20by%20TEMPO1.pdf; http://umpir.ump.edu.my/id/eprint/22159/; https://doi.org/10.1016/j.molliq.2018.08.123

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.