Compound GO And CNTs On Mg₂Ni Hydrogen Storage Alloy Structure And Influence Of Electrochemical Performance

Hydrogen energy is recognized as the cleanest energy in the world,and the reserves of hydrogen are also very high.Therefore,research on the development and utilization of hydrogen energy is of great significance to our lives.In theory,the hydrogen storage capacity of magnesium-based hydrogen storage alloys is relatively high,for example,Mg₂Ni is as high as 3.6 wt.%,and the price is low,but it has disadvantages such as harsh hydrogen absorption and desorption conditions and poor kinetic performance.Studies have shown that various carbon-based materials can improve the various properties of hydrogen storage alloys.This article focuses on the improvement of the composite graphene oxide(GO)in the Mg₂Ni alloy on the hydrogen storage performance of the alloy,and further explores the graphene oxide(GO)and carbon nanotubes(CNTs)composite Mg₂Ni alloy,its structure,electrochemical performance and dynamic performance.(1)By ball milling different carbon-based materials graphene(G),mesoporous carbon(CMK),carbon nanotubes(CNTs)and graphene oxide(GO)composite Mg₂Ni alloys,it was found that they can significantly increase the maximum discharge capacity and improve the discharge capacity.Electrodynamic performance.Among them,when graphene oxide(GO)is compounded,the maximum discharge capacity reaches 173.75 m Ah/g,and the optimal preparation process of the experiment is discussed.(2)Changing the composite amount of graphene oxide(GO),it is found that the discharge capacity of the alloy also changes.In a certain recombination range,the recombination amount has a positive correlation with the maximum discharge capacity of the alloy.When the recombination amount is 15 wt.%,the maximum discharge capacity is 292.30 m Ah/g,the discharge characteristic platform is also the longest.At the same time,the self-discharge of the battery can be reduced.(3)The alloy sample Mg₂Ni+15 wt.%GO with the best composite ratio was selected to study the influence of ball milling time on its electrochemical performance.The results show that as the ball milling time continues to increase,the discharge capacity of the alloy does not increase,but decreases.The experiment confirms that the best ball milling time is 5 h.(4)On the basis of Mg₂Ni+15 wt.%GO,different proportions of carbon nanotubes(CNTs)are compounded.With the increase of CNTs content,the discharge capacity first increases and then decreases,indicating that the electrochemical properties of Mg₂Ni+15 wt.%GO alloy can be improved by the addition of appropriate amount of CNTs.