期刊
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
卷 21, 期 3, 页码 759-766出版社
SPRINGER
DOI: 10.1007/s10008-016-3431-0
关键词
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资金
- National Natural Science Foundation of China [21271069, J1210040, 51238002, J1103312]
- Science and Technology Program of Hunan Province [2015JC3049]
- Fundamental Research Funds for the Central Universities [531107040898]
Porous nitrogen-doped graphene (PNG) has been prepared via simple thermal treatment of graphene oxide and urea, and the morphology and structure of the PNG have been characterized by using a range of electron microscopy, X-ray photoelectron spectroscopy, and other techniques. The electrochemical performances of the PNG have been investigated in an ionic liquid electrolyte by cyclic voltammetry and galvanostatic charge-discharge via both three-electrode and two-electrode configurations. The PNG electrode delivers a specific capacitance of 310 F g(-1) at 1 A g(-1) with good cycling stability over 4000 cycles. The high electrochemical performance is ascribed to the porous structure and nitrogen-doping in the PNG. The porous structure enables high specific surface area and rapid ion mobility, contributing to double layer capacitance, while the N-doping enhances electrochemical activity and electric conductivity, contributing to pseudocapacitance. Meanwhile, the ionic liquid electrolyte enables a very wide working voltage of 3 V, leading to a high energy density up to 163.8 W h kg(-1). The fabricated supercapacitor can light up a LED for a long while with low self-discharge, showing good potential for practical application.
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