Preparation And Properties Of Electrodeposited Porous Nickel-based Hydrogen Evolution Electrode

With the rapid development of society,the energy crisis has become increasingly serious.Hydrogen is considered to be one of the most ideal and promising energy in the future due to its advantages of renewability,cleanliness and high efficiency.The development of catalyst electrodes for hydrogen evolution reactions with over-potential and low cost is expected to solve the problem of high energy consumption via electrolyzing water.Nickel-based electrodes have become the most widely used hydrogen evolution cathode materials due to their high hydrogen evolution activity and good stability in alkaline solutions.Porous nickel electrode,porous nickel-based rhenium-nickel electrode and porous nickel-based copper-rhenium electrode were prepared by electrodeposition method.The prepared electrodes were characterized by scanning electron microscopy,transmission electron microscopy,energy dispersive spectroscopy,inductively coupled plasma emission spectroscopy,and X-ray photoelectron spectroscopy,and were evaluated by electrochemical method.The main research contents are as follows.?1?Porous nickel electrode was prepared by constant current deposition using hydrogen bubble as templates.The influence of preparation conditions on the pore size and pore distribution of porous nickel was studied,and the optimal conditions were determined.The results show that the porous nickel prepared by electrodeposition under suitable conditions has an open macroporous structure with high porosity.?2?The effects of different solution concentrations,current densities and deposition time on the hydrogen evolution performance of porous nickel-based rhenium-nickel composite electrodes were studied by constant current deposition on porous nickel.The optimum deposition conditions were determined.The results show that the electrode still has an open macroporous structure and a high porosity after the deposition of rhenium nickel;the rhenium is uniformly distributed on the porous nickel surface;the deposited rhenium consists of metal rhenium and its oxides.?3?The co-deposition of copper-rhenium on porous nickel by potentiostatic deposition was carried out.The effects of different solution concentrations and deposition potentials on the hydrogen evolution performance of porous nickel-based copper-rhenium electrodes were investigated,and the optimal conditions were determined.The results show that the electrodes still have an open macroporous structure and a high porosity after the deposition of copper-rhenium.The rhenium element is uniformly distributed on the porous nickel surface;the amount of rhenium deposited is 3.2×10^-3 mg/cm² and the amount of copper is 4×10^-3 mg/cm².