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Developing earth-abundant materials to replace platinum (Pt)/Pt-based materials is an inevitable tendency for the progress of fuel cells due to the practical application limits. Recently, heteroatoms doped (N, S et al.) carbon materials, such as carbon nanotubes and graphene, have attracted great interests because of their amazing electrochemical activity towards oxygen reduction reaction (ORR). Herein,...
A non-contact method is proposed to characterize graphene at microwave frequency by combining Raman spectroscopy and Amphenol Precision Connector (APC-7). The CVD-grown graphene is transferred to the ring-shape Teflon substrate and characterized by Raman spectroscopy to estimate its doping density and the related Fermi energy. The graphene is then sandwiched between two APC-7 coaxial connectors and...
Multi-layer graphene standing on polycrystalline SiC microspheres was prepared by pyrolyzing liquid polysilacarbosilane. The lateral dimension of the multi-layer graphene is ∼100nm and the average diameter of the microspheres is ∼0.9μm. The growth of the multi-layer graphene is proposed to be initiated by phase separation of the microspheres, and facilitated with both crystallization inside and chemical...
Graphene nanowalls have been synthesized on diamond by direct-current plasma enhanced chemical vapor deposition (CVD) on silicon substrates pre-seeded with diamond nanoparticles in gas mixtures of methane and hydrogen. Switching from diamond CVD to graphene CVD is done by increasing the methane concentration and decreasing the plasma power without breaking the vacuum. Graphene nanowalls stand on the...
A PAN-based carbon fiber paper preform prepared by a dry casting method was impregnated with phenolic resin mixed with graphite powder, which was mold-pressed, cured, carbonized and graphitized to prepare carbon paper for proton-exchange membrane fuel cells (PEMFCs). The effect of graphite powder content on the properties of the carbon paper was investigated. Results showed that the thickness, porosity,...
The electrochemical behavior of glassy carbon (GC) electrodes coated with multi-walled carbon nanotube (MWCNT)/surfactant films was studied in an ionic liquid and a phosphate buffer solution (pH=6.86), using cyclic voltammetry. The dispersion of MWCNTs in different media was investigated by scanning and transmission electron microscopy. Cast films of MWCNT/zwitterionic dodecyldimethylamine oxide on...
Cyclic voltammograms (CVs) of C 60 films and C 60 embedded in cast films of triple-tailed cationic surfactant solutions and salt-free zero-charged cationic/anionic (catanionic) surfactant vesicles on glassy carbon electrode in a typical room-temperature ionic liquid (RT-IL), 1-n-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF 6 ]), were examined. CVs show typically...
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