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To meet the requirements of the energy storage materials for high energy density and high power density, porous silicon carbide/derived carbon-spherical natural graphite (SiC-CDCs@NG) composites were prepared. The composites were composed of tailored porous carbide-derived carbon and graphitized carbon with excellent conductivity and a high energy storage capacity. The composition, structure, morphology, pore structure, and specific surface area of the composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, and N2 adsorption/ desorption analysis. The composites exhibited a high and adjustable specific surface area and micro-pore volume, with a micro-pore size of between 0.5 and 0.7 nm. Varying the molar ratio of NG and Si allowed optimization of the micro-pore volume, pore size distribution, specific surface area, and composition and content of the CDCs shell and NG core.

Partially reduced graphene oxide/titanium dioxide (RGO/TiO 2 ) composite was synthesized using tetrabutyl titanate and graphite oxide by a hydrothermal method. Photocatalytic activity of the material was evaluated by the degradation of methylene blue solution under visible light and UV light. The results suggest that the crystal phase and dispersion of titanium oxide in the composite can be controlled by varying the reaction temperature and amount of graphite oxide. Graphene oxide was partially reduced in the hydrothermal reaction process. Photocatalytic activities of partially reduced graphene oxide/titanium dioxide composites under both visible and UV light irradiation were higher than those of pure TiO 2 . Partially reduced graphene oxide may act as a support and electron acceptor, and can also extend and enhance the band edge absorption of TiO 2 into the visible light region, hence effectively enhancing the adsorbability and photocatalytic activity of TiO 2 .