Preparation And Electrochemical Performance Of The Porous Carbon Derived From Waste Polymer Materials

Supercapacitor is a new type of energy storage element,which has the advantages of green pollution-free,wide useable environment,high power density,less charging time,long working life and so on.The electrode material directly affects the performance of the supercapacitor.Therefore,the preparation of electrode materials with excellent electrochemical energy storage performance has become an urgent need in this field.Because carbon materials have the advantages of simple production process,excellent electrical conductivity,high stability,easy structure control,many types and high specific surface area,they have been heavily invested in the development of high-performance supercapacitor electrode materials.In this paper,solid waste polymer materials were used as carbon sources,and porous carbon materials with high specific surface area were prepared.Through the use of Raman,BET,XRD,TEM,SEM,XPS,constant current charge and discharge experiments?GCD?,cyclic voltammetry experiments?CV?and other characterization methods,the microscopic morphology and structure and electrochemical performance of the obtained porous carbon materials were explored.The main research contents are as follows:?1?Abandoned hollow fiber filter membrane was used as the carbon source,and argon was used as the protective gas,KOH was used as the activator,and high-temperature pyrolysis activation method was used to prepare porous carbon.The results show that the obtained hollow fiber membrane derived porous carbon material has an amorphous structure,which has an irregular three-dimensional network channel structure.When the carbonization temperature is 700°C,the porous carbon material has a high specific surface of up to 2934 m² g^-1,and is mainly a micro-mesoporous structure.In a 6 M KOH electrolyte,the porous carbon material has a specific capacitance of up to 289 F g^-11 at a current density of 1 A g^-1.After 5000constant-current charge-discharge cycles,the capacitance retention rate of the material is 92.8%.?2?The waste polyurethane shoe material is used as the carbon source.In the environment of argon as a protective gas and KOH as an activator,the porous carbon was prepared by a high temperature pyrolysis activation method.The results show that the polyurethane shoe material derived porous carbon material has an amorphous structure.When the carbonization temperature is 800°C,the specific surface reaches1467 m² g^-1.According to the electrochemical test,we know that the obtained porous carbon material XDC-800 has excellent electrochemical reversibility,good capacitance performance and excellent rate performance,showing excellent electric double layer capacitor behavior.The specific capacitance of the porous carbon material XDC-800 can reach 280 F g^-11 at a current density of 1 A g^-11 in a 6 M KOH electrolyte.After 5000 cycles of charge and discharge tests,the capacitance retention was 95.7%,showing an excellent stability.?3?Using waste PET foam as a carbon source,under the environment of argon as a protective gas,and KOH as an activator,a PET foam plastic derived porous carbon material was prepared by a high-temperature pyrolysis activation method.The experimental results show that the obtained porous carbon material has an amorphous structure.The porous carbon material has a honeycomb-like channel structure.When the carbonization temperature is 700°C,it has a specific surface of up to 2281 m² g^-1.The specific capacitance of the porous carbon material PMC-700 is up to 296 F g^-11 at a current density of 1 A g^-11 in a 6 M KOH electrolyte.After 5000 cycles of charge and discharge tests,the capacitance retention of the obtained porous carbon material is87.1%,showing a good electrochemical stability.