Preparation And Hydrogen Storage Properties Of Reduced Graphene Oxide-PMMA/Mg Nanocomposites

Since the beginning of the 20 th century,the industrial development and rapid economic growth of western countries need more energy to meet the growing demand of their daily life,and energy is mainly extracted from fossil fuels.However,excessive use of these fossil fuels will have a significant impact on the sustainable development of the environment.Today,sustainable development has become the focus of global attention.Hydrogen is an ideal clean and green energy source.At present,hydrogen has been used in all walks of life.The scale preparation of hydrogen is the basis of hydrogen energy application,and the scale storage and transportation of hydrogen is the key to hydrogen energy application.Magnesium is considered as one of the potential candidates for hydrogen storage because of its light weight,high hydrogen storage capacity(7.6 wt%),high content,small environmental impact and wide application.In this paper,we prepared three kinds of composite materials: polymethyl methacrylate / magnesium(PMMA/Mg),reduced graphene oxide / magnesium(RGO /Mg)and reduced graphene oxide polymethyl methacrylate/magnesium(RGO-PMMA/Mg),and explored the effect of adding PMMA and RGO on the hydrogen storage performance of nano-magnesium.The specific research contents are as follows:(1)Polymethyl methacrylate/magnesium(PMMA/Mg)composite was prepared by using lithium naphthalene as reducing agent,PMMA and methyl magnesium chloride as raw materials.The polymer is used as the dispersion controller of nanometer magnesium,and can form the shell amount of oxygen resistant polymer related to hydrogen.The growth of magnesium particles in organic materials is probably due to the electrostatic attraction of magnesium particles and organic materials through their surface functional groups such as C-O and O=C-O.(2)Based on the above preparation principle,the reduced graphene oxide /magnesium(RGO / Mg)composite was prepared with reduced graphene oxide and methyl magnesium chloride as raw materials,and the samples did not agglomerate.It was found that the magnesium particles grew uniformly on the graphene sheet.The hydrogen storage performance of reduced graphene oxide is very low.When it is compounded with nano-magnesium,its hydrogen storage performance is significantly improved.(3)Using PMMA and reduced graphene oxide as raw materials,RGO-PMMA embedded nano-magnesium composite was prepared.The samples were placed in the air for 45 days.It was found that a small amount of oxide was introduced into the samples,which indicated that the samples could effectively isolate oxygen and water molecules in the air.In order to study the hydrogen storage performance of the sample,RGO-PMMA was prepared.By comparing its adsorption performance,it was found that the sample had 1.32 wt% absorption capacity at atmospheric pressure,and the initial temperature of desorption was 60 ?,indicating that the sample had high hydrogen storage performance.