Graphene oxide（GO） has attracted extensive attention due to its unique properties and potential applications.Here,we report the investigation of GO nanosheets as a stationary phase for capillary gas chromatographic（GC） separations.The GO column,fabricated by a new one-step coating approach,showed average McReynolds constants of 308,suggesting the medium polar nature of the GC stationary phase.The GO stationary phase achieves good separation for analytes of different types with good peak shapes,especially for H-bonding analytes,such as alcohols and amines.The different retention behaviors of GO stationary phase from the conventional stationary phase may originate from its multiple interactions with analytes,involving H-bonding,dipole-dipole,π-π stacking and dispersive interactions.Moreover,GO column showed good separation reproducibility with relative standard deviation（RSD%） less than 0.24%（n = 5） on retention times of analytes.
Pt heterostructures can have distinctly different physical and chemical properties to their single-phase components. Herein,a smart approach was developed for the large-scale production of graphitic C3N4–Pt(gC 3N4–Pt) heterostructures on three-dimensional(3D) graphene sheet networks for highly efficient methanol oxidation. Because the gC 3N4–Pt heterostructures on the conductive 3D graphene network support provide the methanol molecules good accessibility to the active sites,the obtained catalyst exhibits excellent electrocatalytic performance,including high catalytic activity,unusual CO tolerance,and good stability,and is superior to commercial Pt/C and Pt/graphene catalysts for methanol oxidation.
