Electrochemically Preparation And Synthesis Of Ni-Mo-Cu Alloy Coating Electrode For Electro-catalytic Hydrogen Evolution Performance

Hydrogen energy is an ideal choice of clean energy in the future. Method of alkaline water electrolysis hydrogen production is an important way to mass industrial preparation of hydrogen. So the research and development of new cathode with high catalytic activity of hydrogen evolution electrode material is a very important way to solve the currently existing in electrolytic water industry on the problem of low efficiency of large energy consumption. Research shows that, the hydrogen evolution over potential can be reduced by the synergistic of its electro-catalytic components, so as to achieve the purpose of improving the efficiency of electrolysis of water. And others found that amorphous structure material has better catalytic activity of hydrogen analysis than the crystal structure. At present, the Ni-Mo alloy was proved to be the best binary alloy with hydrogen catalytic activity in the alkaline solution electrolysis of water analysis. The preparation of Ni-Mo-Cu ternary alloy is through the electro-deposition method based on Ni base binary alloy. We hope that high catalyzed hydrogen evolution electrode materials can be obtained through the synergy between three kinds of alloy elements.This article explores the best technology parameters of constant current electro-deposition of Ni-Mo-Cu of ternary alloy. The influence of technology parameters which contains copper concentration in plating solution, the pH of plating solution, electroplating current density and electroplating temperature towards related alloy coating performance of Ni-Mo-Cu ternary alloy coating are investigated. In the end, this article researches the HER performance and dynamic behavior through tafel curves, the steady-state polarization curves and EIS. We draw the following conclusions:(1) Preparation conditions of electro-deposition and the ionic concentration of plating solution have a great influence to Ni-Mo-Cu alloy coating surface morphology, composition and analytical hydrogen electric performance. The experimental results show that the best preparation process conditions of Ni-Mo-Cu ternary alloy coating is:the molar ratio of Ni, Cu element in plating solution is25:1, the electroplating current density is50mA/cm2, pH=8-9, T=25℃and the electroplating time is1.5h. Magnetic stirring is accompanied in the entire process of electro-deposition.(2) The best preparation process conditions of preparation of Ni-Mo-Cu alloy coating is amorphous structure. The grain size is very small which can reach nanometer scale. The thickness of Ni-Mo-Cu alloy coating is about9micrometers. The morphology of alloy coating presents a kind of typical "cauliflower shape" rough surface morphology. Atomic ratio of Ni, Mo, Cu three kinds of elements in alloy coating is48%,15.6%and36.4%.(3) Adding Cu elements has a very obvious role in promoting effect to hydrogen evolution of catalytic activity. The prepared Ni-Mo-Cu alloy coating electrode exhibits lower over-potential, lower activation energy and better stability toward the HER than Ni-Mo alloy electrode.(4) The HER efficiency observed for the Ni-Mo-Cu alloy coating electrode can be explained by a synergistic combination of its electro-catalytic components and the increased surface area.(5) The EIS analysis results and the hydrogen evolution reaction kinetic parameters obtained by tafel curves indicate that:The ternary alloy electrode is a pure reaction controlled by the kinetics of factors. Electrochemical stripping step is the main control step of hydrogen evolution reaction.