Large-scale vertical graphene on nickel foil as a binder-free electrode for high performance battery-like supercapacitor with an aqueous redox electrolyte

Xiaobo Chen and Yipei Li and Mingliang He and Binghua Zhou and Deliang Cheng and Shien Guo and Keng Xu and Cailei Yuan and Mingxi Wang and Hironori Ogata and Gan, Melvin Jet Hong and Yoong Ahm Kim and Mauricio Terronesi and Morinobu Endo and Zhipeng Wang (2023) Large-scale vertical graphene on nickel foil as a binder-free electrode for high performance battery-like supercapacitor with an aqueous redox electrolyte. Journal of Power Sources, 575. pp. 1-12. ISSN 0378-7753

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Abstract

Due to the special three-dimensional structures and excellent physicochemical properties, vertical graphene (VG) has been extensively investigated as potential material for supercapacitors. However, achieving VG-based supercapacitors with high-energy density and high-power density is a still tremendous challenge. Here we attempt to synthesize large-scale VG films on flexible substrates and design a novel battery-like supercapacitor (BSCs) with the VG on Ni foil (VG@Ni) as a binder-free electrode operating in the KOH electrolyte with the redox additives of K₃Fe(CN)₆ and/or K₄Fe(CN)₆. The VG@Ni electrodes demonstrate an ultrahigh areal capacitance of 1453 mF cm⁻² at 5 mA cm⁻² in 1 M KOH electrolyte with adding 0.07 M K₃Fe(CN)₆ and 0.07 M K4Fe(CN)6, coulombic efficiency greater than 90%, and long-life cycling stability (capacitance retention is 99.3% after 20000 charge-discharge cycles). The BSCs, which are assembled with two identical VG@Ni electrodes, deliver the areal capacitance of 231 mF cm⁻² with energy density of 32 μWh cm⁻² and power density of 2498 μW cm⁻² at 1 mA cm⁻². These outstanding performances can be ascribed to the special feature and excellent properties of VG materials, high electronic conductivity of binder-free VG@Ni electrode, faradaic properties of redox electrolyte, and synergistic effects between the VG film and redox electrolyte.

Item Type:	Article
Keyword:	Large scale growth, Vertical graphene, Redox electrolyte, High areal capacitance
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 > TK7800-8360 Electronics
Department:	FACULTY > Faculty of Engineering
Depositing User:	SITI AZIZAH BINTI IDRIS -
Date Deposited:	11 Jun 2025 14:55
Last Modified:	11 Jun 2025 14:55
URI:	https://eprints.ums.edu.my/id/eprint/44072

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