期刊
CERAMICS INTERNATIONAL
卷 45, 期 4, 页码 4283-4289出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2018.11.101
关键词
Aqueous asymmetric supercapacitors; Cathode material; Hexagonal boron nitride nanosheet; Carbon-modified; Nanocomposite; Solid-state method
资金
- National Natural Science Foundation of China (NSFC) [21463013]
- Jiangxi Provincial Department of Science and Technology [20171BAB203013]
- Jiangxi Provincial Education Department [GJJ160290, GJJ170168, GJJ170174]
- Open Project Program of Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Jiangxi Normal University [KLFS-KF-201716]
The two-dimensional hexagonal boron nitride (h-BN) has garnered tremendous interest due to its unique mechanical, thermal and electronic properties. However, the application of h-BN has been restricted as electrode materials for supercapacitors because of its wide band gap and rather low conductivity. Herein, a carbon modified hexagonal boron nitride nanosheet (h-BN/C) nanocomposite is prepared through a facile and scalable solid-state reaction. Interestingly, the h-BN/C nanocomposite as cathode material exhibits a pair of distinct and reversible redox peaks in 2 M KOH aqueous electrolyte. Because of the enhanced electrical conductivity derived from the modified carbon and the increased specific surface area, the h-BN/C nanocomposite presents a high specific capacitance of 250 F g(-1) at the current density of 0.5 A g(-1). More importantly, the fabricated aqueous asymmetric supercapacitor with the h-BN/C as cathode and activated carbon as anode displays an operating voltage of L45 V, an energy density of 17 Wh kg(-1) at a power density of 245 W kg(-1), and high stability up to 1000 cycles. Therefore, h-BN/C nanocomposite would promisingly be a cathode material for aqueous asymmetric supercapacitors.
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