Excellent capacitive performance of a three-dimensional hierarchical porous graphene/carbon composite with a superhigh surface area
Date
2014
Authors
Li, X.
Xing, W.
Zhou, J.
Wang, G.
Zhuo, S.
Yan, Z.
Xue, Q.
Qiao, S.
Editors
Advisors
Journal Title
Journal ISSN
Volume Title
Type:
Journal article
Citation
Chemistry - A European Journal, 2014; 20(41):13314-13320
Statement of Responsibility
Xue Jin Li, Wei Xing, Jin Zhou, Gui Qiang Wang, Shu Ping Zhuo, Zi Feng Yan, Qing Zhong Xue, and Shi Zhang Qiao
Conference Name
Abstract
Three-dimensional hierarchical porous graphene/ carbon composite was successfully synthesized from a solution of graphene oxide and a phenolic resin by using a facile and efficient method. The morphology, structure, and surface property of the composite were investigated intensively by a variety of means such as scanning electron microscopy (SEM), transmission electron microscopy (TEM), N 2 adsorption, Raman spectroscopy, and Fourier transform infrared spectroscopy (FTIR). It is found that graphene serves as a scaffold to form a hierarchical pore texture in the composite, resulting in its superhigh surface area of 2034 m 2 g 1 , thin macropore wall, and high conductivity (152 Sm 1 ). As evidenced by electrochemical measurements in both EMImBF 4 ionic liquid and KOH electrolyte, the composite exhibits ideal capacitive behavior, high capacitance, and excellent rate performance due to its unique structure. In EMImBF 4 , the composite has a high energy density of up to 50.1 Wh kg 1 and also possesses quite stable cycling stability at 100 8C, suggesting its promising application in high-temperature supercapacitors. In KOH electrolyte, the specific capacitance of this composite can reach up to an unprecedented value of 186.5 Fg 1 , even at a very high current density of 50 A g 1 , suggesting its prosperous application in high-power applications.
School/Discipline
Dissertation Note
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© 2014 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim