A carbon-bridge effect was adopted to explain the electromagnetic wave absorbing property related to the cross-linked framework structure of RGO–SCI composites.

N-doped ordered mesoporous carbon−Co composites (Co-N-OMC) with 2D hexagonal structure, uniform pore size (4.4 nm), high surface area (550 m 2 g −1 ), and medium pore volume (0.61 cm 3 g −1 ) were successfully fabricated through facile one-step template method. We employed resol as the carbon precursor, triblock copolymer as the template agent, and cobaltous acetate and urea as additives. XPS analysis revealed that nitrogen was successfully doped in ordered mesoporous carbon and existed in the form of pyridine-like and quaternary-N nitrogen atoms. More importantly, metallic Co nanoparticles with uniform diameter around 15 nm highly dispersed in carbon matrix without adding any dispersion agent, which was probably due to the confinement effect of mesoporous structure. It was unambiguously demonstrated by HRTEM analysis that there were layered graphitic sheets present around Co particles, resulting from in situ catalytic graphitization of amorphrous carbon by Co species. Pt catalyst deposited on Co-N-OMC composite showed an excellent electrocatalytic activity for both methanol oxidation and oxygen reduction reaction, which was probably due to its suitable pore structure, improved degree of graphitization, presence of nitrogen, and high dispersion of Pt nanoparticles.

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Either graphene or carbon nanotube (CNT) is in situ introduced in ordered mesoporous carbon film via a spin-coating method, followed by evaporation-induced self-assembly of precursors and post calcinations. Graphene-modified and CNT-modified ordered mesoporous carbon films show improved electronic conductivity of 0.35 and 0.41 S m À1 , and contact angles of 90 and 96 , respectively, which are significantly higher than the values of 0.0043 S m À1 and 71 measured for the non-doped carbon film, suggesting enhanced graphitization degree and hydrophobic properties. Two different hybrid carbon films deposited on 304 stainless steels as bipolar plates for proton exchange membrane fuel cells reveal remarkable corrosion resistance, which show very low corrosion current densities of 0.140 mA cm À2 and 0.008 mA cm À2 , in comparison with the 0.464 mA cm À2 measured on the bare 304 stainless steel. Such hybrid carbon films with preserved ordered mesporous structure and satisfactory electrochemical performance on 304 stainless steels can be considered as promising candidates for bipolar plate materials in proton exchange membrane fuel cells.