Abstract
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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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant No. 21271069, J1210040, 51238002, J1103312) and Science and Technology Program of Hunan Province (Grant No. 2015JC3049), and the Fundamental Research Funds for the Central Universities (No. 531107040898).
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Liu, D., Fu, C., Zhang, N. et al. Porous nitrogen-doped graphene for high energy density supercapacitors in an ionic liquid electrolyte. J Solid State Electrochem 21, 759–766 (2017). https://doi.org/10.1007/s10008-016-3431-0
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DOI: https://doi.org/10.1007/s10008-016-3431-0