期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 875, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.159929
关键词
Layer double hydroxide; Fluorine-modified; Graphene; Electrochemical exfoliation; Supercapacitor
资金
- National Natural Science Foundation of China [11174197, 11574203]
A facile and binder-free strategy was demonstrated to obtain beta-Ni(OH)(2)/NiCo-LDH@FG as supercapacitor electrodes with high conductivity, ion diffusivity, and mechanical strength. The electrode showed excellent capacitance, remarkable rate capability, and improved cycle life, indicating great potential for improving electrode performance.
As energy consumption grows, the demand for a new generation of high-security, long-life and large-capacity power supplies is growing rapidly. Here we demonstrate a facile and binder-free strategy to obtain beta-Ni(OH)(2)/nickel-cobalt layered double hydroxides (beta-Ni(OH)(2)/NiCo-LDH) coupled with fluorine-modified graphene (FG) as supercapacitor electrodes (beta-Ni(OH)(2)/NiCo-LDH@FG) via hydrothermal method, synchronous electrochemical exfoliation of graphite into fluorine-modified graphene and assembly on beta-Ni(OH)(2)/NiCo-LDH. This hybrid structure of beta-Ni(OH)(2)/NiCo-LDH and modified graphene as supercapacitor electrode displays high conductivity, high ion diffusivity and strong mechanical strength. As a result, the beta-Ni(OH)(2)/NiCo-LDH@FG electrode possesses excellent capacitance (3996 mF cm(-2) at 1 mA cm(-2)), remarkable rate capability and improved cycle life. The beta-Ni(OH)(2)/NiCo-LDH coupled with undoped electrochemically exfoliated graphene exhibits the significantly improved cycle stability (79% capacitance retention after 1000 cycles at 5 mA cm(-2)), superior to that of beta-Ni(OH)(2)/NiCo-LDH (31%). Therefore, this strategy has great potential to improve the performance of electrodes. (C) 2021 Elsevier B.V. All rights reserved.
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