Rapid Preparation of Graphene Hydrogel by Microwave Digestion Reduction and its application in supercapacitors

Tang Yi; Wang Xingyan; Jin Xianming; Dai Youzhi; Wang Xianyou

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Rapid Preparation of Graphene Hydrogel by Microwave Digestion Reduction and its application in supercapacitors

Tang Yi 1 #,Wang Xingyan 1 *,Jin Xianming 1,Dai Youzhi 1,Wang Xianyou 2

1.Department of Environmental Science and Engineering,College of Chemical Engineering,Xiangtan University,Xiangtan 411105,China

2.School of Chemical,Xiangtan University,Xiangtan 411105,China

*Correspondence author

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Funding: Hunan Provincial Natural Science Foundation of China （No.2015JJ6109）, National Natural Science Foundation of China （No.51302239）, Specialized Research Fund for the Doctoral Program of Higher Education（No.2134301120007）

Opened online:13 November 2015

Accepted by: none

Citation: Tang Yi,Wang Xingyan,Jin Xianming.Rapid Preparation of Graphene Hydrogel by Microwave Digestion Reduction and its application in supercapacitors[OL]. [13 November 2015] http://en.paper.edu.cn/en_releasepaper/content/4660549

Graphene hydrogels have been successfully prepared by a simple and fast microwave digestion through reducing graphene oxide, and used as the electrode materials for supercapacitors. The morphology, structure and components of the graphene hydrogel are characterized by scanning electron microscopy (SEM), Transmission electron microscopy (TEM), X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis, X-ray photoelectron spectroscopy (XPS). The electrochemical performances of the graphene hydrogel are evaluated by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), electrochemical impedance spectroscopy (EIS) in 6 M KOH electrolyte. The results show that the graphene hydrogels possess well-defined and interconnected 3D porous networks and exhibits excellent electrochemical performance for supercapacitors. Particularly, the MGH-10 prepared by microwave digestion within 10 mins shows the highest specific capacitance. The MGH-10 electrode owns specific capacitance as high as 204 F g-1 at the scan rate of 2 mv s-1, which is higher than Hydrothermal method. Furthermore, the MGH-10 supercapacitor delivers high energy densities of 6.8 W h kg-1 and 5.9 W h kg-1 at the power density of 1000 W kg-1 and 5000 W kg-1, respectively.

Keywords:Graphene; hydrogel;microwave digestion;supercapacitor

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