Preparation Of Sulfur-doped Nickel-molybdenum Catalysts And Research On The Performance Of Electrolyzed Water

Hydrogen energy is known as a very promising"secondary energy".At present,the high efficiency catalytic activity of precious metal platinum,but due to its reserves,prices and other reasons,it limits its large-scale industrial applications.Starting from the basic point of designing and developing efficient transition metal catalysts,the main contents of this paper can be summarized as follows:(1)The steady-state diffusion is constructed using rotating disk electrodes(RDE)and the S_5-40doped Ni and S_5-40 doped Ni₄Mo deposition kinetics dynamics are analyzed using the Koutechy-Levich equation.The speed control steps for S_5-40doped Ni and S_5-40 doped Ni₄Mo electrical deposition are determined as electrochemical and diffusion control.The effects of temperature on the kinetic behavior of S₂₀ doped Ni and S₂₀ doped Ni₄Mo deposition are investigated.When the temperature reached 60?and 70?,the diffusion coefficient(D)is the highest,which promoted the diffusion in solution and increased the reaction rate constant(k).(2)Preparation and properties of S₂₀doped Ni/CF electrodes,copper foam substance is prepared by one-step electrodeposition.In the 1.0 M KOH system,for(Oxygen Evolution Reaction,OER),(Hydrogen Evolution Reaction,HER)and electrolytic water performance analysis,this material all showed good activity at 10m A cm^-2,overpotential and electrolytic water voltage are 376 m V,-146 m V,and1.73 V,respectively.and 60 h hydrogen analysis and oxygen analysis stability tests.(3)Based on S₂₀doped Ni/CF,Mo elements are further introduced to realize the co-deposition of Ni,Mo and S ternary compounds to obtain the S₂₀doped Ni₄Mo/CF electrode in Ethaline.The introduction of Mo elements and the Ni formation Ni₄Mo alloys significantly improve the conductivity of the catalyst,Hydrogen evolution at10 m A cm^-2,Excess potential for oxygen evolution and total water m V,-128 V,140m V and 1.595 V.The hydrogen production rate reached 99.1%and the test potential of hydrogen evolution,oxygen evolution and total hydrolysis stability after 60 h is only 27.3 m V,22 m V and 15 m V.At the same time,after 60 h of electrolysis,Image changes on the anode electrode surface,Moreover,the performance of hydrogen evolution and oxygen evolution is improved to varying degrees.The activation energy(Ea)of S₂₀doped Ni₄Mo/CF and Ni₄Mo/CF are 16.24 k J mol^-1 and 18.54 k J mol^-1 according to the thermodynamic Arrhenius formula,respectively,which indicates that sulfur doping can reduce the activation energy and improve the catalytic efficiency.Finally,the effect of urea oxidation on oxygen evolution performance is analyzed,and the oxygen evolution performance is increased by141.1%1.8 V vs.RHE.To sum up,the prepared S₂₀doped Ni₄Mo/CF catalyst has high efficiency catalytic activity,which provides a new idea for improving the electrolytic water hydrogen production performance of transition metal sulfides.