Preparation and properties of Fe and Ni supported nitrogen doped carbon based bifunctional Catalysts
In order to solve the problems of scarce and expensive catalyst materials required for oxygen reduction reaction(ORR)and oxygen precipitation reaction(OER)in fuel cells,a dual-function FeNi/C-PM-X catalyst was prepared by water-bath method and doped with Fe and Ni.SEM and TEM were used to analyze its surface morphology and composition.Physical adsorption instru-ment was used to characterize the specific surface area and pore size of the sample.The lattice structure of the material was tested by X-ray diffractometer.Use spectrometers to analyze the graphitization degree of samples;X-ray photoelectron spectroscopy(XPS)was used to characterize the valence state,element content and functional groups of the samples.It was found that the catalyst FeNi/C-PM-900 had excellent resistance to methanol poisoning,and the half-wave potential of oxygen reduction reaction reached 0.801 V,which was comparable to platinum-based catalyst.When the current density is 10 mA·cm-2,the overpotential of oxygen pre-cipitation reaction of FeNi/C-PM-900 is 0.44 V,and the dual-function catalyst is good.Fe and Ni metal doped carbon materials have ideal specific surface area and stability.The experimental results show that Fe doping can greatly accelerate the charge transfer ki-netics and produce a synergistic effect between the Ni center and itself,which can greatly improve the oxygen reduction and oxygen precipitation performance.
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