Preparation Of Graphene-based Composite Materials And Research Of Their Application In The Field Of Energy

With traditional fossil fuel dwindling and the resulting increasingly environmental problems,a great deal of attention have been paid to the development and utilization of renewable green energy,to seek the harmonious development of mankind and the environment.Carbon materials is firstly investigated and also one of the most widely researched supercapacitor electrode materials,as a new type of carbon material with two-dimensional structure,graphene has a theoretical specific surface area of 2630 m2 g-1,thus it is regarded as an ideal electric double layer capacitor electrode material.In addition,graphene has unique surface properties and also good electrical conductivity,the theory figure of merit value of the zigzag graphene nanobelts can reach 4,therefore graphene is also expected to be applied to the thermoelectric materials.Here,Mg?OH?₂ nanoplates supported on reduced graphene oxide?Mg?OH?₂/rGO?has been established by using Mg powder as the reductant without the addition of any acid.The prepared Mg?OH?₂/rGO was characterized by Fourier transform infrared spectroscopy?FT-IR?,X-ray diffraction?XRD?,thermogravimetric analysis?TGA?,transmission electron microscopy?TEM?and X-ray photoelectron spectroscopy?XPS?.The results show that,graphene oxide?GO?was reduced by Mg powder effectively,and resulting Mg?OH?₂ nanoplates was uniformly loaded on the graphene layer.Electrochemical performance of the Mg?OH?₂/rGO electrode was measured using a three-electrode system,and Mg?OH?₂/rGO shows good electrochemical activity.Reduced graphene oxide?M-rGO?with porous structure was obtained using the same reduction method.The obtained M-r GO was characterized by XRD,Raman,TEM,etc.The surface pore size distribution of M-rGO was obtained using a autosorb iQ instrument?Quantachrome U.S.?and the electrochemical performance of the Mg?OH?₂/rGO electrode was also obtained.The experimental results show that the prepared M-rGO shows an ideal surface pore structure,as well as excellent chemical surface state,these features make it excellent supercapacitor electrode materials.Moreover,antimony telluride nanoplates supported on reduced graphene oxide?Sb₂Te₃/rGO?was obtained by a solvothermal method.The obtained Sb₂Te₃/rGO was characterized using XRD,scanning electron microscopy?SEM?,etc.The GO introduced can effectively control the morphology of Sb₂Te₃,thus improve the thermoelectric properties of Sb₂Te₃.