Synthesis Of Porous Polymer Materials And Their Derivatives For Supercapacitor

Due to global warming,coal,oil and other energy shortages,looking for new renewable green energy is the topic of today's development.Supercapacitors are favored by scientific research workers because of their high power density and excellent cycling stability.Metal-organic framework materials and covalent organic framework materials and their derivatives have attracted attention because they can provide high specific surface area and more active sites in the electrode materials of supercapacitor.Therefore,it is of great significance to study their supercapacitor-peformance as electrode materials.In this paper,by synthesis of porous polymer materials and their derivatives,we could make both the morphology and electrochemical properties of the supercapacitor materials well controlled.1.A new type of supercapacitor material with cobalt-nickel bimetallic complex assisted by melamine was synthesized.The specific capacitance can also reach 677 F·g^-1.Subsequently,the complex was prepared as an asymmetric supercapacitor device(ASC).After A long cycling test,i.e.,10,000 cycles,ASC device showed high cycle stability and good rate stability when the current density was 10 A·g^-1,and the capacitor retention was92.6%of the initial value.The experimental results show that the composite can not only withstand the high pressure of 1.4 V at room temperature,but also has an energy density of28.35 Wh·kg^-1 and a power density of 700 W·kg^-1.2.A novel hollow structure Mn/C composite supercapacitor material was synthesized by one-pot method.The morphology and structure of Mn MOFs could be well controlled by the reaction temperature and time.And then the Mn MOFs(MM-80)was carbonized at 400,600and 800?(MME-C-400/600/800)to make the electrode material of supercapacitor.The MME-C-600 can maintain the hollow sphere structure,and at the current density of 1 A·g^-1,its maximum specific capacity can reach 568 F·g^-1 in the three-electrode system with 2.0 M KOH electrolyte.3.High-faradaic-active nitrogen-rich hexaazatrinaphthalene-based CTF(HATNC-400)and its carbonized derivatives(HATNC-500/600/700/800)are used as potential electrode materials of supercapacitors.HATNC-400 and its carbonized derivatives possess varied nitrogen content and high specific surface area.The results reveal that HATNC-400 exhibits excellent capacitive performance with the highest specific capacitance of 687 F·g^-1 at 1 A·g^-1,outstanding rate capability of 430 F·g^-1 at 10 A·g^-1 and superior long-term cycling stability(i.e.,90.7%after 10000 cycles at 10 A·g^-1),in a three-electrode system with 2.0 M KOH electrolyte.Furthermore,the redox-active triazine units in HATNC-400 share about?60.2%of the specific capacitance in the form of pseudocapacitors.In addition,the symmetric supercapacitor device fabricated with 2.0 M KOH electrolyte delivers a maximum energy density is 9.7 Wh·kg^-1.