Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 271, Issue -, Pages 31-39Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molliq.2018.08.123
Keywords
MWCNTs; Functionalization; Nitroxides; TEMPO; Supercapacitance
Funding
- National Science Centre of Poland (NCN) [DEC-2013/09/B/ST5/00988]
- Ministry of Education Malaysia FRGS [RDU160118: FRGS/1/2016/STG07/UMP/02/3]
- Universiti Malaysia Pahang [RDU170357]
- Deanship of Scientific Research at King Khalid University [R.G.P.2/2/38]
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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-l-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. (C) 2018 Elsevier B.V. All rights reserved.
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