Mingliang He and Jia Qiao and Binghua Zhou and Shien Guo and Guozhen Zhu and Jie Wang and Gan, Melvin Jet Hong and Mingxi Wang and Hironori Ogata and Yoong Ahm Kim and Mauricio Terrones and Morinobu Endo and Fei Zhang and Zhipeng Wang (2025) MOF-derived carbon nanotube/vertical graphene composite: A binder-free electrode for high-performance supercapacitors with aqueous redox electrolyte. Carbon, 241. pp. 1-11. ISSN 0008-6223
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Abstract
Vertical graphene (VG), with its unique 3D structure and exceptional properties, is considered an excellent electrode material for supercapacitors. However, the strong hydrophobicity of VG significantly limits its performance in aqueous supercapacitors. In this study, we successfully construct a hybrid carbon nanotubes-vertical graphene-carbon cloth (CNT-VG-CC) structure by converting metal-organic frameworks (MOFs) into carbon nanotubes (CNTs) on the VG surface. This hybrid structure is then employed to fabricate a novel binder-free electrode for hybrid supercapacitors, which operate in a KOH electrolyte with redox additives, K3Fe(CN)6/K4Fe(CN)6. The resulting CNT-VG-CC hybrid structure not only exhibits superhydrophilicity but also offers a large effective specific surface area, enhancing electrolyte contact. The CNT-VG-CC electrode demonstrates an ultrahigh areal capacitance of 1526.5 mF/cm2 at 10 mA/cm2, nearly 100 % coulombic efficiency, and exceptional cycling stability, retaining 100 % of its capacitance after 10,000 charge-discharge cycles. The assembled supercapacitor device delivers a high energy density of 179.7 μW h/cm2 at a power density of 8000.0 μW/cm2. Remarkably, after 10000 cycles, it retains 118.9 % of its initial areal capacitance and maintains a coulombic efficiency of 90.7 %. These impressive performances can be attributed to the unique CNT-VG-CC hybrid structure, its super-hydrophilic property, high electronic conductivity, lager effective specific surface area, and synergistic interaction between the redox electrolyte and the CNT-VG-CC electrode.
| Item Type: | Article |
|---|---|
| Keyword: | Carbon nanotubes, Vertical graphene, Metal-organic framework, Redox electrolyte, Supercapacitor |
| Subjects: | Q Science > QD Chemistry > QD1-999 Chemistry > QD146-197 Inorganic chemistry T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK1-9971 Electrical engineering. Electronics. Nuclear engineering > TK2896-2985 Production of electricity by direct energy conversion |
| Department: | FACULTY > Faculty of Engineering |
| Depositing User: | SITI AZIZAH BINTI IDRIS - |
| Date Deposited: | 15 Jul 2025 16:18 |
| Last Modified: | 15 Jul 2025 16:18 |
| URI: | https://eprints.ums.edu.my/id/eprint/44487 |
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