Application Of Graphitic Carbon Nitride Materials In Supercapacitors

With the rapid development of economy,while human beings enjoy the benefits of industrial progress,it also causes problems such as the scarcity of traditional energy sources and the worsening environment.Therefore,the search for clean renewable energy has become one of the major tasks.g-C₃N₄ has many advantages,such as its stable chemical properties,non-toxic,simple synthesis,economic environmental protection,so that we consider it as the electrode material of supercapacitors to explore.In this paper,the carbon nitride composites with large specific surface area and good conductivity.g-C₃N₄ composites,possessing large specific surface and good conductive,was prepared by dealing with g-C₃N₄using alika resolution shear and high temperature calcination,and used as electrode material in supercapacitors.Through Cyclic Voltammetry?CV?,Galvanostatic charge and discharge?GCD?,AC impedance spectrometry?EIS?,cyclic stability and other performance measure methods.To measure the feasibility of carbon nitride based materials as electrode materials for supercapacitors.The main contents of the paper and the corresponding results are as follows:Using urea,cyanamide and thiourea as raw materials,to investigate the effect of different raw materials on the specific capacitance properties of carbon nitride,g-C₃N₄ was prepared by thermal shrinkage polymerization.The experimental results show that the products prepared by urea as raw materials have the best specific capacitance properties.The experimental results show that the electrochemical properties of g-C₃N₄ synthesized by urea as precursor are the best,and its capacitance value can reach 54F·g^-1,and the specific capacitance value of g-C₃N₄ nanowires prepared with urea is 65F·g^-1.The three-dimensional skeleton structure of carbon nitride nanowires was prepared by shear treatment of carbon nitride with different concentrations of sodium hydroxide,and it was mechanically mixed with poly?3,4-thiophene?:poly?4-styrene sulfonate??PEDOT:PSS?,in order to improve the conductivity of the product and increase the specific surface area of the product.Finally,the product obtained after freeze-drying treatment.We found that the proportion of the mixture applied to supercapacitors at 20%was the best performance.Three-electrode test at the scanning rate of 5mv·s^-1 specific capacitance for202F·g^-1,two electrode device test reached 78F·g^-1,and an excellent capacity retention rate of 83.5%after 5000 cycles.Mixing g-C₃N₄ with glucose through hydrothermal reaction,after drying the mixture,in the nitrogen environment,through the tube furnace calcination treatment,the preparation of nitrogen-doped porous carbon materials,through the performance measurement.We found that under the conditions of 120? hydrothermal reaction,the final preparation of nitrogen-doped porous carbon performance is the best,It has an ultra-high specific surface area and excellent electrical conductivity.And it has good performance in supercapacitor device applications.Three-electrode test at the scanning rate of 5mvs^-1 specific capacitance for 265F·g^-1,two electrode device test reached 54F·g^-1,and charge and discharge 10000cycles can maintain the capacitance value of 90.23%.Finally,the electrochemical properties of g-C₃N₄ are effectively improved by shear treatment and high temperature calcination.In addition,the temperature and time of shear during treatment,as well as the temperature of water heat mixing,has a great influence on its composites.