Effects of surface structure on the electrochemical properties of Nimetal complex oxide film electrode

Abstract

Effects of surface structure on the electrochemical properties of Ni—metal complex oxide film electrodes prepared by radio frequency magnetron sputtering method and by thermal decomposition method have been investigated. Rotating disc electrode technique was applied to evaluate the electron transfer rate of the redox system [Fe(CN) 6] 3−/[Fe(CN) 6] 4− in 0.1 M NaOH solution. Dynamic impedance method to detect the impedance change of electrode/electrolyte interface and X-ray photoelectron spectroscopy were also used. The NiMo complex oxide film electrode prepared by rf magnetron sputtering method was found to have good stability, good reproducibility and effective electrochemical properties in comparison with the oxide film electrodes prepared by thermal decomposition method. Then, of the electrodes prepared by thermal decomposition method, the NiMo complex oxide film and the NiRe complex oxide film were shown to have good electrochemical properties. It was found by XPS analysis that both Mo ion at a higher oxidation state and oxygen influenced from this Mo ion, which showed clear occurrence for the NiMo oxide film prepared by rf sputtering method and no occurrence by thermal decomposition method, played a very important role in the reaction.