Preparation And Research On Properties Of Flexible Biomass-derived Carbon Electrode Materials

As energy storage and transportation equipment,the research and application of carbon-based flexible electrode materials has attracted much attention in promoting energy-saving economy.The flexible,lightweight and portable features are extremely important in some application fields.In this paper,the electrode material is modified by carbonization on the basis of biomass textile fiber.The method of hetero atom doping and pore-forming can improve the specific capacitance and increase the specific surface area of carbon materials,further improving their electrochemical performance.The research of carbon-based flexible membrane electrode materials also provides a guarantee for the composite electrode materials of capacitor such as carbon material doping metal oxides and conductive polymers.The microstructure,composition and specific surface area of modified carbon fiber electrode materials were characterized and the electrochemical properties were tested.First of all,the chitin textile is carbonized at 600-1000°C to obtain a high performance and ultra-flexible carbon electrode material.After high-temperature carbonization,the fiber surface becomes rough due to thermal decomposition.As the carbonization temperature increased,the carbon fiber film obtained an increased specific surface area.In addition to its high mechanical flexibility,the carbon membrane electrode has a maximum specific capacitance of 112.6 Fg^-1at 1 Ag^-1and excellent cycle performance of 94.0%capacitance retention rate after 5000 times.Secondly,the chitin fiber cloth was treated by solvent heat treatment,that is,C₃N₄compound was loaded on the fabric,and then calcined at high-temperature carbonization for2h.The modified carbon fiber obtained was studied by the electrochemical tests.Considering the effect of PTA on the fiber composition structure,the electrochemical performance of the material pretreated with PTA was also investigated.The carbon fiber membrane materials under the optimal optimization conditions with high flexibility were characterized by XRD,Raman,XPS,SEM and BET.Their specific capacitance can reach up to 150.9 Fg^-1at a current density of 1 Ag^-1,which is 34%higher than direct carbonization.After 3000 cycles,the specific capacitance retention was 88.7%.Finally,the composite material is prepared based on biomass material from bamboo fiber textile.The bamboo fiber textiles were treated at different carbonization temperature and prepared into foldablely high-flexible carbon fiber membranes.The electrode materials were comparively studied with those prepared by direct carbonization or carbonization after hydrothermal reaction.The modified membrane material has a specific capacitance value of140.4 Fg^-1at a current density of 1 Ag^-1,and a retention specific capacitance of 122 Fg^-1after3000 cycles,along with good rate performance and impedance characteristics.The results show that the electrochemical properties of the materials are good.