| In a variety of the renewable and clean energy,hydrogen is favored by people because of its high combustion heat and no pollution of combustion products.Hydrogen production is an important part of the full utilization of hydrogen energy by mankind.There are different kinds of synthesis methods of hydrogen,but water electrolysis technology is a kind of high efficiency,abundant raw materials,without geographical restrictions,product pollution-free production technology.In the process of industrialization and large-scale hydrogen production,The biggest problem which people are currently facing is that the high energy consumption in the electrolysis process.In order to popularize and develop the technology of hydrogen production by electrolysis of water,the preparation of cathode materials with better electrocatalytic performance is an important route to reduce the energy consumption of hydrogen production from electrolytic water.In this paper,nickel-based hydrogen evolution materials were prepared by electrochemical deposition method which was very simple,easy operation and low cost.In this work,we firstly prepared the binary Ni-Mn electrode by electrochemical deposition method and studied the effects of the nickel salt concentration,the p H value of the electrolyte,cathodic current density,deposition temperature and time on the electrode surface morphology,composition,structure as well as the catalytic activity of hydrogen evolution,and the mechanism of hydrogen evolution of Ni-Mn electrode was discussed.The results show that the conditions of electrodeposition are NiSO4·6H2O?20g/L?,MnSO4·H2O?150g/L?,pH=3.0,deposition temperature T=25?,deposition time t=20min,cathode current density jc=200mA/cm2,the prepared Ni-Mn electrode has the best hydrogen evolution activity.When the hydrogen current density is10mA/cm2,the hydrogen evolution potential is 169mV and the exchange current density is6.9×10-4A/cm2.Secondly,the ternary Ni-Mn-Sn electrode was synthesized by electrochemical deposition method.We explored the effects of stannous salt concentration,cathode current density and deposition temperature on the surface morphology,composition,structure and electrocatalytic performance of the electrode.In addition,the mechanism of hydrogen evolution of Ni-Mn-Sn electrode was discussed.The results showed that the conditions of electrodeposition wereNiSO4·6H2O?20g/L?,MnSO4·H2O?150g/L?,SnSO4?0.02mol/L?,pH=3.0,deposition temperature T=25?,deposition time t=20min,the cathode current density is jc=200mA/cm2,the prepared Ni-Mn-Sn electrode has the best hydrogen evolution activity.When the hydrogen current density is 10mA/cm2,the hydrogen evolution potential is 190mV and the exchange current density is6.9×10-4A /cm2. |
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