Application Of Doped Functionalized Carbon Materials For Catalytic Oxidation And Supercapacitor

Carbon nanomaterials have excellent specific physicochemical properties such as large specific surface area,hierarchically porous structure,excellent electronic and thermal conductivity,and surface functionalization,which make them have wide application in the fields of energy,catalysis,environmental protection,and electronics.In the field of catalysis,carbon nanomaterials can not only be used as a support for active components,but also function as non-metal catalysts for some important reactions after functional modification.In the field of energy conversion and storage,carbon nanomaterials are often used as significant electrode materials due to their excellent electronic conductivity.So,it is of great importance to develop new method to fabricate functionalized carbon nanomaterials and explore their applications in the fields of catalysis and energy,which is helpful to promote the green and sustainable development of catalysis and renewable energy.The main achievements of this thesis are as follows:(1)A method for preparing nitrogen-doped functional carbon material NC(HAP)using hydroxyapatite as a template and accelerator,and small nitrogen-containing organic molecule1,10-phenanthroline as precursor has been developed.The applications of the functionalized carbon material as a catalyst and electroactive materials were explored.NC(HAP)exhibits excellent catalytic activity and selectivity to target product in the oxidative coupling of benzylamine(conversion:95%,selectivity:100%).It also shows good electrochemical performance when NC(HAP)was applied as electrode material for supercapacitors.The specific capacitance at a current density of 0.5 A/g is 366 F/g.The capacitance retention rate is 98.5%after 5000 charge and discharge cycles at 10 A/g.(2)A strategy for fabricating nitrogen-doped carbon material(NC-HAP-700)using the monomer of chitin,N-acetylglucosamine,as a precursor was developed.The nitrogen-containing carbon material,NC-HAP-700,exhibits good electrochemical performance when is used as electrode material.At a current density of 0.5 A/g,the capacitance reaches to 346 F/g,which is higher than the capacitance of most similar materials reported in references.After 5000 charge-discharge cycles,the capacitance retention rate was92%.The experimental and characterization results show that the large specific surface area,hierarchically porous structure,nitrogen and oxygen-containing functional groups contribute to=the good capacitance properties.(3)A kind of sulfur-containing carbon nanomaterial was prepared by using sodium lignosulfonate as a precursor.The carbon material possesses has hierarchically porous structure and high specific surface area of 1080 m~2/g.As an electrode material,this sulfur-containing carbon materialexhibits excellent capacitive properties and good charge-discharge cycling stability in the application of supercapacitance.At a current density of 0.5 A/g,the capacitance can reach to 344 F/g.Control experiments and characterizations demonstrate that the sulfur-containing groups are conducive to the pseudocapacitance of the carbon nanomaterial.