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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...
Porous graphene obtained by chemical vapor deposition (CVD) using porous MgO sheets as template is demonstrated to exhibit a high reversible capacity (1723 mAh g -1 ), excellent high-rate capability and cycling stability for Li-ion batteries. The simple CVD approach offers a new way for large-scale production of porous graphene materials for energy storage.
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 ...
Three-dimensional (3D) hybrid materials composed of 2D fish scale-like polyaniline (PANI) nanosheet arrays on graphene oxide sheets and carbon nanotubes were synthesized by a one-step process using a simplified template-free polymerization method. PANI nanosheet growth is proposed to be accomplished through electrostatic interaction, hydrogen bonding, and π–π stacking interaction. Such a material...
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 ...
Highly corrugated graphene sheets (HCGS) have been prepared by a rapid, low cost and scalable approach through the thermal reduction of graphite oxide at 900°C followed by rapid cooling using liquid nitrogen. The wrinkling of the graphene sheets can significantly prevent them from agglomerating and restacking with one another face to face and thus increase the electrolyte-accessible surface area....
Cobalt core/graphite shell nanostructures anchored on graphene sheets have been prepared by a chemical vapor deposition process. Transmission electron microscope images show that the cobalt nanoparticles (10–30nm) are encapsulated by a graphitic shell with a thickness of ∼3nm. Magnetic measurements reveal that the material has a typical ferromagnetic behavior with a saturation magnetization of 71...
We report the easy synthesis of porous graphene nanosheets (PGNs) using the etching of graphene sheets by MnO 2 . An electrode made from PGNs exhibits a specific capacitance of 154Fg −1 at 500mVs −1 in 6M KOH compared to a value of 67Fg −1 for graphene nanosheets, and a low capacitance loss of 12% after 5000cycles. Interestingly, PGN electrode material shows an excellent...
We used carbon nanotubes as oil adsorbents and evaluated recycling performance by squeezing method. The sorption capacity of 3mm long vertically aligned carbon nanotubes is almost 6.9 times higher than that of agglomerated carbon nanotubes due to the existence of large-sized macropores. Compared with exfoliated graphite (41g/g), aligned carbon nanotubes exhibit higher sorption capacity (69g/g) and...
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...
We have demonstrated an environmentally friendly and efficient route for the reduction of graphene oxide by aluminum powder in only 30min. The highly reduced graphene oxide had been confirmed by X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy and thermo gravimetric analysis. Furthermore, the bulk conductivity of the prepared graphene sheets is 2.1×10 3 S/m, which is...
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...
We have prepared and evaluated the performance of natural graphite (NG)/agglomerated carbon nanotubes (ACNTs) composite materials for future mechanical dampening devices. The mechanical performance of a compressed mixture of NG and ACNTs was examined over the pressure range of 30–300MPa. NG–ACNT composite materials showed improved performance over the ACNT materials alone. Nanocomposites containing...
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...
Graphene nanosheet/polymer composites were prepared using in situ reduction–extractive dispersion technology. The morphology and microstructure of the composites were examined by scanning electron and optical microscopy. The results indicate that graphene nanosheets from the reduction of graphite oxide are about 5nm thick and 1–3μm in diameter. Reduction–extractive dispersion technology can effectively...
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