Porous nitrogen-doped graphene for high energy density supercapacitors in an ionic liquid electrolyte |
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Authors: | Dan Liu Chaopeng Fu Ningshuang Zhang Yanling Li Haihui Zhou Yafei Kuang |
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Affiliation: | 1.State Key Laboratory for Chemo/Biosensing and Chemometrics,Hunan University,Changsha,China;2.College of Chemistry and Chemical Engineering,Hunan University,Changsha,China |
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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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