Preparation And Catalytic Properties Of Porous Nickel-base Composite Electrode Materials

With the depletion of fossil fuels,how to produce hydrogen with high efficiency and low energy consumption has become a research hotspot.At present,one of the effective ways to produce hydrogen on a large scale is to use alkaline electrolytic water.The key to restrict the cost of electrolytic water and the efficiency of hydrogen production is the development of active electrodes for hydrogen evolution.High hydrogen evolution active electrodes should have the following two necessary conditions:one is that they have large active specific surface area,which reduces the real current density on the surface of the electrodes,thereby reducing the hydrogen evolution overpotential;the other is that they have high electrode activity,and the adsorption process of hydrogen ions and the desorption process of hydrogen are more likely to occur.Porous Ni-Sn/MoS₂ hydrogen evolution electrode was prepared by electrodeposition on porous nickel matrix.The deposition rate,surface morphology and hydrogen evolution properties of Ni-Sn/MoS₂ coating were studied.Porous Ni-Sn/MoS₂ composite hydrogen evolution electrode was prepared by electrodeposition on porous nickel substrate using hard template method.The prepared porous Ni-Sn/MoS₂ electrode retains the porous structure of porous nickel.Compared with the traditional flat nickel electrode,it has larger specific surface area and good hydrogen evolution performance.The electrochemical behavior of hydrogen evolution of porous Ni-Sn/MoS₂ in 1 M NaOH solution was studied by means of polarization curve,Tafel curve and electrochemical impedance spectroscopy.The results show that the optimum bath formulations for hydrogen evolution are MoS₂ 6g/L,SnCl₂ 2H₂O 5g/L,NiSO₄ 6H₂O 65g/L,Na₃C₆H₅O₇2H₂O 120g/L,ascorbic acid 2g/L,H₃BO₃ 20g/L,C₁₂H₂₅SO₄Na（SDS）0.1 g/L,C₂H₅NO ₂8g/L,NaCl 15g/L,C₁₉H₄₂BrN 2g/L.The optimum electrodeposition process for hydrogen evolution is as follows:bath temperature 40 C,bath pH 4.0,current density 80 mA/cm².Figure 42;Table 5;Reference 44...