Preparation Of Nanoporous Ni And Ni-Co Alloys And Their Hydrogen Evolution Properties

With the gradual exhaustion of non-renewable energy sources such as coal,oil and natural gas and the gradual strengthening of people's awareness of environmental protection,it is particularly urgent to seek a renewable and environment-friendly new energy source.Hydrogen energy,as a renewable,clean and efficient new energy source,has been widely concerned by people,and more and more attention has been paid to the research of hydrogen preparation methods.At present,the industry mature hydrogen production process,low carbon steel as the cathode material is rainie nickel electrolysis pool system,but this kind of cathode materials existed high potential,electrolysis is not stable for a long time,low corrosion resistance faults.In order to reduce power loss and save energy,it is urgent to study a kind of cathode material with low hydrogen over-potential.There are two factors restricting hydrogen over-potential,namely energy factor and geometric factor.This paper adopts the method of rapid solidification and take off the alloying preparation of nano porous Ni/GCE and nano porous Ni Co/GCE electrode,through SEM,EDS and BET,TEM,XRD,etc methods had been used to characterize the samples on,compares the different composition of precursor alloy after alloying off the e lectrodes in 25 wt%of hydrogen evolution in Na OH solution catalytic performance and stability.1.The morphology after dealloying is closely related to the phase composition and Al content of the precursor alloy.The precursors of different ni-al alloys were analyzed:Ni₃₀Al₇₀ was composed of Ni Al₃ and Ni₂Al₃ phases,Ni₂₅Al₇₅ was composed of Ni Al₃ single phases,and Ni₂₀Al₈₀,Ni₁₅Al₈₅,Ni₁₀Al₉₀ and Ni₅Al₉₅ were all composed of Al and Ni Al₃ phases.The corrosion mechanism of Ni₃₀Al₇₀ is that the Ni Al₃ phase and Ni₂Al₃ phase constitute the primary battery system,and there is a reaction between the corrosion-prone Ni Al₃ phase and the corrosion solution of Na OH.The Ni₂₅Al₇₅ is composed of the single phase of Ni Al ₃,which cannot constitute the original battery system,and is only the chemical reaction between the Ni Al ₃ phase and the Na OH corrosion solution.Ni₂₀Al₈₀,Ni₁₅Al₈₅,Ni₁₀Al₉₀,Ni₅Al₉₅ four kinds of the composition of alloy phase is the same,which is composed of Al and Ni Al ₃two-phase,corrosion mechanism is also same,Al and Ni Al₃ phase form a galvanic cell system,corrosion occurred between the electronic transfer of synergy,at the same time with easy corrosion phase Na OH with Al corrosion liquid chemical reactions,complete the alloying process.With the increase of Al content,the specific surface area of nanometer porous Ni gradually increases,and the specific surface area has an important influence on the hydrogen evolution performance.2.EDS energy spectrum showed that the ratio of Ni and Co did not change before and after the demetallization of seven Ni-Co-Al alloys.Take off the nano porous Ni-Co after alloying morphology difference is small,are irregular reticular formation,Ni₃Co₂Al₉₅5 and Ni_3.5Co_1.5Al₉₅ income skeleton slightly thick,changes in concentrations of Co and no cause much change on morphology structure;Hydrogen evolution performance show Ni_2.5Co_2.5Al₉₅,Ni₃Co₂Al₉₅ income nano porous Ni Co/GCE electrode hydrogen evolution overpotential lo west,the Co content between40⁶0 wt%,the hydrogen evolution catalytic performance is good,it is associated with the synergy of Ni,Co,constitutes the electron transfer channel,further improve the exchange current density of the electrode.3.The nano porous nano porous Ni,Co and composite Ru O₂ nano porous Ni,Co,the initial formation of hydrogen,respectively,are moving 20 m V,20 m V and 40 m V,synergy of Ni,Co,nanometer porous Ni-Co is moved by the larger of the two.Three types of electrode materials after heat treatment of compound R u O₂ structure is more stable,with high hydrogen evolution between the catalytic performance of Ru O ₂ and Ni-Co form a collaborative mechanism,improve the performance of hydrogen evolution and stability of the electrode materials.