Preparation Of Phenol Derivatives Functionalized Graphere And Study On Its Electrochemical Properties

In the past few years,while people are pursuing rapid economic development,they have caused various problems in energy and the environment.People urgently need to seek highperformance,green and environmentally friendly renewable energy to deal with this crisis.And people particularly urgent need to seek high-performance,green and environmently friendly renewable energy.Supercapacitors are a new type of electronic energy storage equipment.Due to the high number of charge and discharge cycles and large power capacity,they have been widely used in many fields.The performance of supercapacitors is largely determin by the edelectrode materials.And graphene has become the material of choice due to its high specific surface area and good conductivity.However,graphene is prone to agglomeration,which lead to its performance being inhibited.At present,the research focus is to fix small organic molecules on the surface of graphene to functionalize graphene to improve the stacking problem between the layers and give full play to the excellent electrochemical performance of graphene.In the work,graphene oxide(GO)is obtained through the improved Hummers legal system.On this basis,GO was modified by non-covalent and covalent methods using phenol derivatives to obtain graphene-based electrode materials.The specific experimental contents are as follows:Firstly,resveratrol @ reduced graphene oxide(3D)(Res@r GO)composite material is prepared by hydrothermal reaction,which is used as the electrode material of the supercapacitor.The structure and properties of composite material is characterized by various characterization means,such as XRD、TEM、FTIR、Raman,etc.The test results prove that the addition of resveratrol(Res)does not destroy the original structure of graphene,and inhibited the agglomeration phenomenon,increases the surface area of the material,thus increases the active sites and improves the specific capacitance.We use the Res@r GO as the working electrode to form a three-electrode system to test the electrochemical performance of composite material.The results show that the specific capacitance of Res@r GO composite material first increases and then decreases with the increase of Res addition.When GO and Res are reacted according to the mass ratio of 3:1,the maximum specific capacitance is obtained.When the current density is 1 A/g,the specific capacitance of 226.8 F/g is obtained.At the current density of 2 A/g,the capacitance retention rate is 89.2% after 1000 cycles.Secondly,use 4-iodophenol and pyridinium 4-toluenesulfonate(PPTS)as raw material to synthesize functional reagent phenol derivatives and synthesize phenol derivatives functional graphene(FGO)by nucleophilic reaction.Polyaniline(PANI)was prepared by in-situ polymerization with using aniline as raw material.Polyaniline/functionalized graphene(PANI/FGO)composite material is prepared by mechanical grinding.The performance of compound product is further studied by various characterization means,such as XRD、TEM、XPS、TGA,etc.We compared the effects of mixing PANI and FGO according to different mass ratios on the electrochemical performance of composite material,and determined that the optimal mass ratio is 8:1.Baesd on electrochemical test results,it can be concluded that when the current density is 1 A/g,the radio capacitance of 350.0 F/g is obtained.At a current density of 10 A/g,the capacitance hold rate is 76.9% after 3000 cycles.