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A method to heal defects in reduced graphene oxide (RGO) is reported, accomplished by using methane + hydrogen plasma. The addition of hydrogen notably shifts the equilibrium between etching and growth of graphene, and suppresses the nucleation of carbon nanoparticles. The best recovery of RGO is observed at 800 °C, resulting in largest integrated Raman 2D/G peak area ratio (0.56) and highest Hall...
Two dimensional topological insulators with high feasibility and room-temperature band gaps are desirable at present. Here, kagome monolayers TMC6 (TM = Mo, W) are systematically investigated by density functional theory and molecular dynamics simulations. TMC6 lattice with one TM layer sandwiched between two trigonal carbon layers is proved to be stable. We identify that band inversion occurs in...
Three-dimensional (3D) graphene structure exhibits promising potential in thermal interface materials (TIMs) due to the continuous network structure and the high thermal conductivity of graphene. Nevertheless, the very low density and the high porosity of the 3D graphene monoliths usually lead to poor thermal transport performance. To overcome these problems, we fabricated the graphene/carbon nanotube...
Spherical carbon beads with a uniform diameter of ca. 0.6–0.8mm and high mechanical strength can be prepared by hydrothermal synthesis. To optimise the performance of these adsorbents for pulverised fuel post-combustion capture, the efficacy of potassium intercalation via a KOH treatment has been investigated, deliberately using nitrogen-free phenolic resin derived activated carbon (AC) beads so that...
Carbon-based materials are important in energy storage and conversion materials, because of their different possible morphologies and superior performance. We discuss relationships between the structure and properties of carbon-based materials as the cathode of the lithium-air battery, discuss the importance of structure design and performance control, specify the research priorities for carbon-based...
Mesoporous polyacrylonitrile and carbon fibers have been prepared by electrospinning and subsequent supercritical drying and carbonization. Polyvinylpyrrolidone was used as a template. Ambient drying, oxidation, and supercritical drying were conducted to investigate the effects of treatment methods on the structure of the fibers. Interesting surface morphologies of the fibers, including nanoconvexities...
The graphene-based macroform (GM) is a new category of macroscopic carbon materials assembled from graphene nanosheets. It possesses superior physical and chemical properties inherited from individual graphene nanosheets, and moreover, has a tunable micro-texture and controlled macro-morphology, which is useful in various areas. In this paper, different macroscopic forms and preparation methods of...
Graphene wrapping is used to experimentally understand how a carbon coating works in improving the electrochemical performance of the LiFePO 4 cathode for a lithium ion battery. A full wrapping of LiFePO 4 by graphene is realized by a self-assembly driven by the electrostatic interaction in a graphene oxide suspension. Results indicate that a partial graphene wrapping provides a balance...
Counter electrode films for dye-sensitized solar cells (DSSCs) were prepared by screen printing using graphite, activated carbon, carbon black and carbon nanotubes (CNTs) as raw materials. The effects of pore structure, BET surface area and the sheet resistance of the as-prepared counter electrode films on the performance of DSSCs were investigated. Results show that the conductivity of the raw materials...
A novel method was developed to synthesize graphite oxide/TiO 2 composites as a highly efficient photocatalyst by in situ depositing TiO 2 nanoparticles on graphene oxide nano-sheets by a liquid phase deposition, followed by a calcination treatment at 200°C. The two-dimensional porous graphene oxide/TiO 2 composites had specific surface area of 80m 2 g −1 being...
A mesoporous carbon membrane was prepared by the organic sol–gel process, ambient drying and carbonization. Resorcinol was polymerized with formaldehyde and formed a sol. The sol was cast on a porous fly-ash ceramic support by dip-coating. After ambient drying and carbonization, a carbon membrane was obtained. The carbon membrane exhibited a sharp pore size distribution with average diameter of 3nm.
Nitrogen-doped carbons were produced using hydrothermal carbonization of nitrogen-containing carbohydrates under mild temperature (180°C). The resulting materials contain significant amounts of nitrogen and display a high degree of aromatization. The nitrogen contents are also retained after further calcination at higher temperatures. All the resulting materials have been thoroughly characterized...
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