Preparation And Properties Of Functional Coatings On Sponge Nickel Surface

Ni-nano TiO2 composite coatings are deposited on sponge nickel surface by composite electrodeposition in this study.The best composite electrodeposition process parameters are found through orthogonal experiment,and good Ni-nano TiO2 composite coatings are prepared.The photocatalytic performance of the prepared composite coatings is studied by using methyl orange simulated wastewater.The influence of pore density of sponge nickel and pH of methyl orange solution on photocatalytic performance are analyzed.I use the transmission electron microscopy(TEM)observe the nano-TiO2 particle’s size and shape,which is in the diluted electroplating solution.I also use the scanning electron microscopy(SEM)observe the surface morphology and use the energy dispersive spectroscopy(EDS)analyze the phase.Using platinum cobalt colorimetry through the HANNA-HI83200 multi-parameter water quality tester to test the orange solution’s platinum cobalt colour reducation,we can study the photocatalytic of sample.The cyclic voltammetric curve,chronoamperometric curve and open circuit potential during the composite electrodeposition are measured by Zennium electrochemical workstation.According to the data,we study the initial kinetics of nickel composite electrodeposition process.The results of the analysis show that the surface of the film prepared by the preferred process is more evenly dispersed TiO2.The results of photocatalysis showes that with the increase of pore density,the decrease of chromaticity of methyl orange solution after UV irradiation for 12 hours increased gradually,which indicating that the catalytic efficiency of the composite coating increased with the increase of pore density.The pH of methyl orange solution has a certain influence on the catalysis of the composite film.The photocatalytic efficiency of neutral solution is the lowest.With the increase or decrease of pH,the photocatalytic efficiency of composite coating will be higher and higher.However,the overall difference is not significant,which indicating that the composite film can adapt to different environment.The initial nucleation of nickel on the surface of sponge nickel follows a nucleation model of Scharifker-Hills.The pure nickel electrodeposition initial nucleation process tends to continuous nucleation mechanism,but the initial nucleation of the composite electrodeposition after adding TiO2 nanoparticles is closer to the transient nucleation mechanism.The results of electrochemical analysis show that with the increase of the concentration of Ti02 nanoparticles,the current of the composite electrodeposition increases and the nucleation sites of nickel increase,thus the nucleation of nickel is promoted.