| In recent years,due to the increasing demand for electronic products,driven the birth and rapid development of flexible electronic devices,flexible electronic devices have changed the thinking mode and way of life of contemporary people in some ways.And they are considered to be the most competitive and development potential of a technology in the 21 st century.How to design and prepare flexible electrode materials with excellent electrochemical properties and flexibility is the focus and difficulty of current research.In this paper,multi-channel carbon foam and polyporous carbon fiber derived from double polymer are constructed using porous carbon materials with high conductivity as the entry point for flexible fluid collection,and then combined with metal oxides and organometrics frame materials,and finally assembled with polymer gel electrolyte to obtain high-performance flexible electrodes.Its main contents include:1.Porous carbon with controllable structure and excellent capacitive performance was obtained by simple preparation method.Nitrogen-doped carbon foam derived from carboxymethyl chitosan was prepared by gel method using potassium tetrborate(K2B4O7ยท4H2O)as template and potassium carbonate(K2CO3)as activator.The prepared carbon foam(KBCF)has stratified pores(i.e.macroporous,mesoporous,and microporous)due to the synergistic action of K2B4O7 and K2CO3.In addition,the doped nitrogen atoms in KBCF from the amino group of carboxymethyl chitosan provide an additional pseudocapacitance.As a result,KBCF has a large specific surface area(up to~3231 m2 g-1),excellent specific capacitance(317 F g-1 for 1 A g-1),and excellent cycle life(96.3% after 10,000 consecutive charge-discharge cycles).The assembled symmetric quasi-solid supercapacitor(KBCF//KBCF)can provide a high power density of 6.84 Wh kg-1 at an energy density of 25 k W kg-1 and 500 W kg-1 at an energy density of 2.35 Wh kg-1.The excellent electrochemical performance of KBCF has broad application prospects in high performance supercapacitor electrodes.2.Independent carbon nanofibers embedded in flexible supercapacitors with metal oxides(Fe2O3)were prepared by electrospinning.Microporous carbon nanofibers were prepared using polyacrylonitrile fiber as a flexible carbon source and polyethylene glycol as a sacrificial template.By optimizing the ratio of metal complex formed by ferric chloride and phenylene in polyacrylonitrile solution,the preparation conditions of flexible electrode with optimal electrochemical performance were obtained.The optimized electrode material of supercapacitor has a capacitance of 467 F g-1 when the current density is 1 A g-1,and a capacitance retention rate of 94% at the end of 10000 cycles.The assembled flexible solid-state supercapacitor has a capacitor retention rate of97.5% after completing 500 bending cycles,which confirms the excellent mechanical durability of the flexible electrode.Samples composed of carbon nanofibers with Fe2O3 embedded uniformly have the required pseudocapacitance characteristics and are a promising choice for flexible solid-state supercapacitors with high energy storage.3.Non-binder and highly flexible carbon nanofibers with rice granular ZIF-67 structure were prepared by combining electrostatic spinning method and hot pressing method for the application of flexible solid-state supercapacitors.The morphology of ZIF-67 modified carbon nanofibers was regulated by controlled calcination,and its effects on electrochemical and mechanical properties were investigated.The optimum sample has a specific capacitance of 624 F g-1 at a current density of 1 A g-1.After the high-strength bending test,the material was charged and discharged without significant interruption,and the capacitance retention rate was 92% after 1000 cycles.These results confirm the long-term stability and outstanding energy storage capacity of the flexible solid-state supercapacitor electrode. |
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