Nickel-molybdenum Based Alloy For Hydrogen Evolution Reaction

The chlor-alkali industry is the basic industry and high energy consumingindustries. As high catalytic activity DSA anode has been widely used in chlor-alkaliindustry, it is necessary to reduce the over-potential of the cathode to make sureenergy conservation and the economic efficiency of enterprises. In this paper,amorphous Ni-Mo and Ni-Mo-P alloys have been prepared by electro-deposition onthe matrix of copper plate or iron. The optimum plating process determined byorthogonal experiments, compare each alloy catalytic activity for hydrogen evolutionreaction (HER) to study the hydrogen evolution mechanism.Take the hydrogen evolution activity of Ni-Mo alloy in6mol·L-1NaOH solutionas an indicator. The optimum plating process determined by orthogonal experiments:(NH4)6Mo7O24.7H2O0.10～0.15mol·L-1, NiSO40.15mol·L-1, current density10A·dm-2, pH9～10, bath temperature is35℃. Steady-state polarization curves testresults show that the over potential of HER at the current density of0.1A·cm-2ofNi-Mo alloy was about320mV lower than that of the pure Ni electrode. As the Mocontent in the Ni-Mo coating increase, the grain size gradually decreases, the HERactivity enhance, but the corrosion resistance gradually weakened. Simulate industrialelectrolytic cell experiments shows Ni-Mo alloy in industrial electrolysis conditionspositive shift about240mV than pure nickel electrode. And also shows excellentresistance to breaking current.The Ni-Mo-P alloy successfully prepared based on the electro-deposition ofNi-Mo binary alloys, and the optimum process conditions determined by orthogonalexperiments. Process studies show that with the increase of the Mo content in thecoating, the grain size gradually decreases, the hydrogen evolution catalyst activityincrease; with the increase of the P content in the coating, the corrosion resistance in6mol·L-1NaOH solution increase, and is better than Ni-Mo alloy. The electrochemicaltest results show that: When the polarization current density of0.1A·cm-2, Ni-Mo-Palloy hydrogen evolution potential positive shift about250mV than that of purenickel plate. But its hydrogen evolution potential is negative shift approximately70mV compare to the Ni-Mo alloy. With the P element in the coating, theelectro-reaction resistance increase, so the decrease of hydrogen evolution activity.But the corrosion resistance of Ni-Mo-P alloy has increased, and so the improvementof its stability.