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Three-dimensional flower-like and hierarchical porous carbon material (FHPC) has been fabricated through a simple and efficient carbonization method followed by chemical activation with flower-like ZnO as template and pitch as carbon precursor. The hierarchical porous structure is composed of numerous micropores and well-defined mesopores in the interconnected macroporous walls. The FHPC electrode...
Two-dimensional mesoporous carbon sheet-like framework (MCSF) material has been prepared using mesoporous SiO 2 nanosheet as template and coal tar pitch as carbon precursor. MCSF sheets consisting of numerous mesopores have a specific surface area of 582.7m 2 g −1 . As a result, the MCSF electrode possesses a maximum specific capacitance of 264Fg −1 at 5mVs −1 ...
A carbon material consisting of hollow carbon spheres anchored on the surface of carbon nanotubes (CNT–HCS) has been synthesized by an easy chemical vapor deposition process using a CNT–MnO 2 hybrid as template. An electrode made of this material exhibits a maximum specific capacitance of 201.5Fg −1 at 0.5Ag −1 and excellent rate performance (69% retention ratio at 20Ag ...
We present a quick and easy method to synthesize graphene–MnO 2 composites through the self-limiting deposition of nanoscale MnO 2 on the surface of graphene under microwave irradiation. These nanostructured graphene–MnO 2 hybrid materials are used for investigation of electrochemical behaviors. Graphene–MnO 2 composite (78wt.% MnO 2 ) displays the specific...
Graphene nanosheet/carbon black composites were prepared by the ultrasonication and in situ reduction methods. Microstructure measurements show that most carbon black particles deposit on the edge surfaces of nanosheets by the ultrasonication method, and on the basal surfaces of nanosheets by in situ reduction method. The electrochemical performances of hybrid materials are superior to pure graphene...
A graphene nanosheet (GNS)/polyaniline (PANI) composite was synthesized using in situ polymerization. The morphology and microstructure of samples were examined by scanning electron microscopy (SEM), transition electron microscopy (TEM), X-ray diffraction (XRD) and Raman spectroscopy. Electrochemical properties were characterized by cyclic voltammetry (CV) and galvanostatic charge/discharge. GNS as...
Exfoliated graphite (EG) containing manganese oxides was rapidly and efficiently prepared by microwave irradiation. The maximum expanded volume of EG was up to 317mLg −1 when the mass ratio of natural graphite and nitric acid to potassium permanganate was 1:2:2. EG showed specific capacitance of 97.5Fg −1 at a scan rate of 1mVs −1 due to a pseudo-capacitance originated from...
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