Synthesis and Electrocatalytic Performance of N-Doped Ordered Mesoporous Carbon-Ni Nanocomposite
Highly ordered mesoporous carbon co-modified with Ni-N can be prepared via homogeneous phase route as well as dual-phase route,named as Ni-N-OMC-1 and Ni-N-OMC-2 respectively.Triblock copolymer Pluronic F127 were employed as the template agent,urea as the N precursor,NiCl2 as the Ni source and resorcinol-formaldehyde resin as the carbon precursor.X-ray diffraction (XRD),Raman,and transmission electron microscope (TEM) showed that nickel particles dispersed in the carbon matrix in forms of metal nickel,in situ catalyzing the graphitization of amorphous carbon.X-ray photoelectron spectroscopy (XPS) revealed that urea existed in four different N species after heat treatment:sp3 nitrogen atoms bonded to carbon atoms,pyridine-like N,sp2 nitrogen atoms bonded to carbon atoms and quaternary-N atoms.The co-modification of nitrogen and nickel changed the physicochemical properties of carbon matrix,thus making for the loading and dispersing of Pt.Pt nanoparticles deposited on Ni-N-OMC-1 nanocompsite showed excellent electrocatalytic activity.The electrochemical active surface area of hydrogen oxidation was 138.53 m2·g-1 and the limiting current density in ORR was 5.32 mA ·cm-2,which indicated higher electrocatalytic ability than that of the commercial 20％ Pt/C catalysts (4.49 mA·cm-2,96.98 m2·g-1).
homogeneous phase routedual-phase routeordered mesoporous carbonco-modified with Ni-Nelectrocatalytic activity
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