Nanocrystalline Ni Mo Fe alloy deposits were obtained by electrodeposition. The structures of the alloy deposits were analyzed by X ray diffraction (XRD) and X ray photoelectron spectroscopy (XPS). The XRD results...Nanocrystalline Ni Mo Fe alloy deposits were obtained by electrodeposition. The structures of the alloy deposits were analyzed by X ray diffraction (XRD) and X ray photoelectron spectroscopy (XPS). The XRD results of nanocrystalline Ni Mo Fe alloy deposit show that many diffraction lines disappear, and that there is only one diffraction peak at 44.0°. The XPS results of nanocrystalline Ni Mo Fe alloy deposits indicate that the nickel, molybdenum and iron of the deposits exist in metallic state, and that the binding energy of the alloyed elements increases to some extent. The nanocrystalline Ni Mo Fe alloy deposit electrode may offer better electrocatalytic activity than the polycrystalline nickel electrode and the nanocrystalline Ni Mo alloy electrode. The electrochemical impedance spectra from the nanocrystalline Ni Mo Fe alloy electrode indicate that hydrogen evolution in 30% ( m/m ) KOH at lower overpotential is in accordance with the Volmer Tafel mechanism, but with the Volmer Heyrovsky mechanism at higher overpotential.展开更多
基金theNationalNaturalScienceFoundationofChina (No .2 0 0 73 0 3 7)theMajorStateBasicResearchDevelopmentProgram (No .2 0 0 2CBZ 1180 0 )
文摘Nanocrystalline Ni Mo Fe alloy deposits were obtained by electrodeposition. The structures of the alloy deposits were analyzed by X ray diffraction (XRD) and X ray photoelectron spectroscopy (XPS). The XRD results of nanocrystalline Ni Mo Fe alloy deposit show that many diffraction lines disappear, and that there is only one diffraction peak at 44.0°. The XPS results of nanocrystalline Ni Mo Fe alloy deposits indicate that the nickel, molybdenum and iron of the deposits exist in metallic state, and that the binding energy of the alloyed elements increases to some extent. The nanocrystalline Ni Mo Fe alloy deposit electrode may offer better electrocatalytic activity than the polycrystalline nickel electrode and the nanocrystalline Ni Mo alloy electrode. The electrochemical impedance spectra from the nanocrystalline Ni Mo Fe alloy electrode indicate that hydrogen evolution in 30% ( m/m ) KOH at lower overpotential is in accordance with the Volmer Tafel mechanism, but with the Volmer Heyrovsky mechanism at higher overpotential.
