Study On The Structure And Morphology Regulation Of Nickel Based Nanofibers And Their Catalytic Hydrogen Production Performance

One dimensional nanomaterials,namely nanofibers,have special effects such as small size effect,quantum size effect and surface effect due to their special morphology,so they have attracted extensive attention in recent years.Because of these differences from traditional materials,it has a very wide application value and prospect in microelectronics,chemical industry,medicine and molecular assembly.With the development of scientific research in nanoscale,it is found that nanofibers have outstanding mechanical stability,and the reduction of particle size makes the specific surface area of unit mass increase,and the potential active sites increase.Therefore,the application of nanofiber material catalyst in industry has become more and more important,among which the application of metal nanomaterials is more extensive,especially nickel has the advantages of high activity,wide source,low cost and easy to obtain,which has become a commonly used catalyst active metal.It has been shown that the activity of the catalyst can be improved by using the interaction between metals and increasing the specific surface area.Therefore,based on the characteristics of nanofibers and the requirements of industrial catalytic production,this paper studies and develops a nickel based nanofiber catalyst with high efficiency,stability and simple process for catalytic hydrogen production.?1?The precursor solution was prepared by Ni Ac and Co?NO₃?₂·6H₂O in anhydrous ethanol.HAc was used as hydrolysis inhibitor to adjust the ratio of Ni and Co.The nanofibers were prepared by electrospinning at 60k V and 15cm,and then Ni Co nanofibers were obtained by in-situ reduction at 500?vacuum.The products were soaked in solution and loaded with nano Pd Cl₂ particles,and Ni Co Pd nanofibers were obtained by reduction with Na BH₄.The nanomaterials were used to catalyze the hydrolysis of sodium borohydride to produce hydrogen.The optimal ratio is determined as Ni:Co:Pd=9:1:1.At 30?,its TOF value was 680 ml min^-1gcat^-1.In addition,the stability of Ni Co and Ni Co Pd nanofiber catalysts at 30?was tested.The results showed that the activity of the catalysts remained above 90%after 10 cycles.The results show that the sensitivity of Ni Co and Ni Co Pd nanofibers to temperature is weak,and they are suitable for catalytic reaction at room temperature.?2?Using Ni Ac as Ni source,molybdophosphoric acid(H₃Mo₁₂O₄₀P),ammonium molybdophosphate(H₁₂Mo₁₂N₃O₄₀P)and ammonium dimolybdate??NH₄?₂Mo₂O₇?as Mo source,the precursor solution was prepared in anhydrous ethanol,and nanofiber materials were prepared by electrospinning.After drying,Ni Mo/Ni Mo O₂ nanofibers were obtained by in situ reduction at 500?.The samples were prepared into solution,then the working electrode was prepared on FTO,and the HER performance of the samples in different electrolytes was tested.The results show that the nanofibers with molybdophosphoric acid(H₃Mo₁₂O₄₀P)as Mo source have unique band structure in SEM.The results show that the nanofibers have excellent HER activity and stability in 1m KOH solution.The overpotential is only 62 m V when the current density is 10 m A·cm^-2.After 3000 cycles of testing,the HER activity has not decreased significantly.