عنوان المقالة:A wide potential window symmetric supercapacitor by TEMPO functionalized MWCNTs A wide potential window symmetric supercapacitor by TEMPO functionalized MWCNTs
جمعه عبدالجواد محمد على | Gomaa A. M. Ali | 20072
- نوع النشر
- مجلة علمية
- المؤلفون بالعربي
- Gomaa A.M. Ali, E. Megiel, J. Romański, H. Algarni, K.F. Chong
- المؤلفون بالإنجليزي
- Gomaa A.M. Ali, E. Megiel, J. Romański, H. Algarni, K.F. Chong
- الملخص العربي
- 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.
- تاريخ النشر
- 28/08/2018
- الناشر
- Journal of Molecular Liquids
- رقم المجلد
- 271
- رقم العدد
- الصفحات
- 31-39
- رابط خارجي
- https://www.sciencedirect.com/science/article/pii/S016773221832556X#!
- الكلمات المفتاحية
- MWCNTs, Functionalization, Nitroxides, TEMPO, Supercapacitance