Preparation Of Ternary Non-noble Metal-based Hydrogen Evolution Electrode By Electrodeposition

Currently,Pt element is the most widely used precious metal HER material,but commercial electrolysis of water requires the use of Pt on a large scale and a large area,and Pt which is rare and expensive on the earth is not suitable for commercial hydrogen production.Therefore,it is of great theoretical significance and practical application value to explore the preparation of non-noble metal hydrogen evolution electrode to replace the precious metal.In this paper,Cu-Ni-Mo,Ni-Fe-S and Ni-Mo-S hydrogen evolution electrodes with high electrochemical active surface area and excellent catalytic activity of hydrogen evolution were prepared by electrodeposition.The morphology,structure and phase state of hydrogen evolution electrodes were characterized by SEM,EDS,XRD,XPS.And the electrochemical performance of hydrogen evolution electrodes was tested by LSV,EIS,CV.The main results are as follows:?1?The surface of Cu-Ni-Mo hydrogen evolution electrode is a cauliflower-like structure formed by fine-grain clusters.When the current density is 10 mA·cm^-2,the hydrogen evolution overpotential is only 38.5 mV,and the Heyrovsky step is the rate-determining step of the hydrogen evolution reaction.In Cu-Ni-Mo hydrogen evolution electrode,Mo has a great influence on the hydrogen evolution performance of hydrogen evolution electrode.Compared with Cu-Ni hydrogen evolution electrode,Cu-Ni-Mo hydrogen evolution electrode has a smaller charge transfer resistance and a larger active surface area.The addition of Mo element transforms the alloy from crystal structure to amorphous structure and the electrochemical active surface area of the electrode increases greatly,thus the efficiency of hydrogen evolution reaction gets improved.?2?The surface of the Ni-Fe-S hydrogen evolution electrode is mainly composed of uneven hilly cells.When the current density is 10 mA·cm^-2,the hydrogen evolution overpotential is only 62.7 mV,and the hydrogen evolution reaction mechanism is mainly the Volmer-Heyrovsky process.The Fe element in the Ni-Fe-S hydrogen evolution electrode plays a non-negligible role in the hydrogen evolution reaction:Fe element not only promotes the amorphousness of the hydrogen evolution electrode,but also further strengthens the ability of the electrode surface to adsorb H atoms,improves the Volmer process,and promotes the kinetic reaction process.?3?The surface of the Ni-Mo-S hydrogen evolution electrode is formed by a large number of dense micro-nano spherical particles.When the current density is 10 mA·cm^-2,the hydrogen evolution overpotential is 96.5 mV,and the Heyrovsky step is the rate-determining step of the hydrogen evolution reaction.There is a good synergy between Ni₃S₂ and MoS₂ in Ni-Mo-S hydrogen evolution electrode,which makes the electrode have excellent electron transfer ability.At the same time,the unsaturated active sites on the edge of MoS₂ are more conducive to improving the dynamics of hydrogen evolution electrode.