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Excellent Capacitive Performance of a Three‐Dimensional Hierarchical Porous Graphene/Carbon Composite with a Superhigh Surface Area
Author(s) -
Li Xue Jin,
Xing Wei,
Zhou Jin,
Wang Gui Qiang,
Zhuo Shu Ping,
Yan Zi Feng,
Xue Qing Zhong,
Qiao Shi Zhang
Publication year - 2014
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201402897
Subject(s) - materials science , graphene , supercapacitor , composite number , fourier transform infrared spectroscopy , capacitance , scanning electron microscope , chemical engineering , raman spectroscopy , electrolyte , specific surface area , composite material , nanotechnology , chemistry , electrode , organic chemistry , optics , physics , engineering , catalysis
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 S m −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 °C, 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 F g −1 , even at a very high current density of 50 A g −1 , suggesting its prosperous application in high‐power applications.