Preparation And Capacitance Performance Of Polymer Based Carbon And Composites

Supercapacitors?SCs?,as a new type of energy storage device,due to its advantages in safety,efficiency,environmental,high specific capacity and power density,so it has great potential in modernization energy transformation in the near future.Electrode materials play an important role in determing the whole performance of SCs,thus the study in electrode materials has attracted extensive attention of people.Although the conductive polymer and materials have very extensive application in SCs electrode materials,the existing of its various defects have a serious restriction in satisfying the growing demand of people.So the modification and composite of above-mentioned materials have gradually become the hot spot of research.Using the recombination of molybdenum disulfide or graphite oxide would effectively combine the advantages of each component,and may play a great role in promoting the electrochemistry performances of materials.Using heteroatom doped resin as precursor,after carbonization,the obtaining heteroatom doped polymer based carbon materials would effectively introduce the pseudocapacitance and improve the specific capacity.In addition,on the basis of heteroatom doped polymer based carbon materials,making full use of template to creating pore structure,and getting pore size grading,uniform distribution and high surface area hierarchical porous polymer based carbon materials.The electrochemistry performances would be more excellent because the high specific surface area.The main contents of this paper are introduced as follows:1.Using molybdenum disulfide as precursor,the polypyrrole/MoS₂ composite materials were prepared by template method and chemical oxidation in situ method.The microscopic morphology of all the composites was testing by TEM and SEM,and the chemical structure was charactered by FTIR and XRD,the results show that due to the electrostatic interactions,the molybdenum disulfide was successfully compound on polypyrrole nanotube and the MoS₂ nanosheets significantly increased the specific surface area of the composite materials.Finally used electrochemical method to characterize the electrochemical performances of all samples and the capacitance performances of composites were more remarkable than pure components.2.Thiourea aldehyde resin-based heteroatom doped carbon and graphene oxide composites?RHDC/GO?were prepared by an in situ polymerization and carbonization.Scanning electron microscopy?SEM?and transmission electron microscopy?TEM?images showed that thiourea aldehyde resin deposited on lamellar GO flakes during the polymerization and RHDC/GO composites had a hierarchical structure.The specific capacitance of the RHDC/GO composites was high up to 355 F/g,much higher than that of the pure thiourea aldehyde resin-based heteroatom doped carbon?RHDC?with specific capacitance of 135 F/g at a current density of 1.0 A/g in 6 mol/L KOH electrolyte.And the hetroatoms in RHDC/GO composites increase the specific capacitance and GO enhances the conductivity of the electrodes which is beneficial to improving electrochemical cycling stability of the electrode significantly.The specific capacitance retains 90.97%after 5000 charge-discharge processes at 10 A/g which provides potential as supercapacitors.3.Using containing nitrogen and sulfur atoms doped thiourea formaldehyde resin as the substrate of resin based carbon materials,mesoporous polymer based carbon materials were prepared by the simple template method and then hierarchical porous polymer based carbon materials were successfully achieved by using different size templates.Utilizing SEM and TEM to characterize the chemical structure and specific surface area were analyzed by FTIR,XRD and BET,the results show that the hole distribution was very uniform,and the specific surface area of the material was significantly increased.And according to the galvanostatic charge-discharge test,under the current density of 1 A/g,the specific capacitance of pure polymer based carbon materials was 135 F/g,and under the current density of 10 A/g,the specific capacitance was only 42 F/g in 6 mol/L KOH aqueous solution;the specific capacitance of mesoporous polymer based carbon materials was 318 and 146 F/g under the corresponding current density;and the specific capacitance of hierarchical porous polymer based carbon materials was 521 and 226 F/g under the corresponding current density,thus it can be seen the porous struture has great effect on the electrochemical properties of materials.