Preparation Of Ni-Mo-W/P Foam Eletrolytic Water For Hydrogen Production By DC Electrodeposition

Alkaline electrolysis water hydrogen production is the most mature electrolysis water hydrogen production technology,which is easy to operate,long service life and easy to achieve scale.However,this technology still has disadvantages,mainly because the energy consumption of the system is still high and limited by the power cost,so it is necessary to continuously optimize the hydrogen evolution electrode material to reduce the energy consumption of electrolysis.Ni-Mo/NF electrode and Ni-Mo-W(P)/NF,using nickel foam(NF),physical advantages,metal loading and metal stability.(1)The stable existence form of the experimental base ions was obtained by Hydra software,and the possible reaction process during the electrodeposition process was analyzed.Taking hydrogen evolution overpotential as the measurement index,the best preparation conditions of binary porous electrode were determined through orthogonal test and single factor experiment.The results show that Ni-Mo/NF binary porous material,the coating surface is granular with some cracks,and the elements are evenly distributed.The electrochemical test shows that the hydrogen overpotential is 0.131 V,the Tafel slope b is 135.6 m V/dec,and the electrochemical impedance spectrum,the EIS Rct is 84.13Ωand the activity specific surface is 23.2 cm~2.The stability test of 3000cycles of CV is only 4.6%more than the original overpotential value,proving that the stability is still better.(2)For the crack problem of binary coating,a third element is introduced to study the preparation process of Ni-Mo-W/NF ternary alloy.Taking the overpotential of hydrogen evolution as the measurement index,the best preparation process conditions of ternary porous electrode were determined through orthogonal test and single factor experiment.The coating surface showed large granular accumulation and almost no cracks,and the elements were evenly distributed.Through first-principle calculation,the formation energy of replacement solid solution is formed after doping W atoms,which results in negative value,namely-6.386 e V,which proves better stability.The electrochemical test results showed that the hydrogen evolution overpotential of the ternary porous electrode is lower,0.122 V,the Tafel slope b is 128.3 m V/dec,and the third element W was introduced,which improved the hydrogen evolution performance of the electrode.Electrochemical impedance testing showed that its EIS Rct was 69.23Ω,demonstrating a low charge transfer resistance and obtaining a large activity ratio surface of 63 cm~2.The stability test of 3000 cycles of CV is 1.9%more stable compared to the original value.(3)The electrode material of P as a third deposited element is also investigated.The influence of the preparation conditions on the morphology,structure and electrochemical properties of the sample were investigated,and the results showed that the coating surface showed a“honeycomb”morphology,which can provide a larger reaction specific surface area and expose more active sites of the material.The overpotential is 109 m V and the Tafel slope b is 121.8 m V/dec.Compared with the Ni-Mo binary porous electrode,22 m V and the Ni-Mo-W 13 m V respectively,and the hydrogen evolution performance is better.Its 3000 cycle CV stability test was increased by 6.8%compared to the original value.