Li, X.Xing, W.Zhou, J.Wang, G.Zhuo, S.Yan, Z.Xue, Q.Qiao, S.2015-11-092015-11-092014Chemistry - A European Journal, 2014; 20(41):13314-133200947-65391521-3765http://hdl.handle.net/2440/96330Three-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.en© 2014 Wiley-VCH Verlag GmbH & Co. KGaA, WeinheimCarbon; conducting materials; graphene; supercapacitors; surface chemistryJournal article003001555710.1002/chem.2014028970003427709000382-s2.0-849411057332-s2.0-849078572522-s2.0-8490630228176178Qiao, S. [0000-0002-1220-1761] [0000-0002-4568-8422]