Preparation And Electrocatalytic Activities For Hydrogen Evolution Of Nickel-based Alloy Electrode

Hydrogen is favored by the majority of researchers,not only because the combustion product is water,zero carbon emissions,but also because it can be used as an energy carrier to make up for the shortcomings of other secondary energy.Hydrogen can be prepared by zero carbon electrochemical water decomposition,which has attracted worldwide attention.However,high energy consumption limits the development of hydrogen production technology from electrolytic water.Therefore,it is urgent to find cheap hydrogen evolution electrode materials with high catalytic activity and high durability.Based on the above research background,the following studies are carried out in this paper:（1）Ni Co W catalytic electrode was prepared by constant current electro-deposition method.The effects of sodium tungstate concentration and electrodeposition current density in the bath on the coating morphology,phase structure and hydrogen evolution performance of Ni Co W catalytic electrode were studied.The Ni Co W ternary alloy has lower hydrogen evolution overpotential than Ni Co binary alloy.When the concentration of sodium tungstate in the bath is 50 mmol/L,the electrodeposition time is 30 min,the current density is 120m A cm^-2,and the temperature is 30℃,the prepared Ni Co W catalytic electrode has the best catalytic performance for hydrogen evolution.Only 130 m V overpotential is needed to drive the current density of 100 m A cm^-2 in 1 M KOH with a Tafel slope of 82 m V dec^-1,a large electrochemical active surface area 21.98 cm^-2 and good stability.The excellent hydrogen evolution performance may be due to the increase of tungsten content in the coating,which changes the surface morphology of the electrode,thus greatly increasing the real specific surface area and increasing the active sites used for hydrogen evolution reaction.（2）Using constant current electro-deposition method,Ni Mo@Ni（OH）₂ catalytic electrodes are prepared to determine the Ni Mo@Ni（OH）₂ catalytic electrodes at the optimal Mo introduced content.When the electro-deposition time is 60 min,the current density is100 m A cm^-2,the concentration of ammonium diphate in the plating solution is 8.0 mmol/L,and the temperature is 28℃,the Ni Mo@Ni（OH）₂ catalytic electrode prepared has the best catalytic hydrogen properties.Only 95 m V over-potential is required to drive the current density of 100 m A cm^-2 in 1 M KOH,the Tafel slope is 86 m V dec^-1,the larger electrochemically active surface area,and has good stability.