| As a new type of green energy storage device,supercapacitors comply with the development requirements of the times and become a new research hotspot in recent years.Electrode materials,as an important part of supercapacitors,are crucial to the improvement of their performance.Conductive polymers Polypyrrole and polyaniline are widely used due to their good environmental stability and ease of synthesis.The carbon nanotubes themselves have poor dispersibility defects and are composited with conductive polymers after functional modification of the carbon nanotubes.This article mainly introduces the preparation of nanocomposites by functionalized carbon nanotubes and conductive polymers of polypyrrole and polyaniline,and studies their properties.The main results are as follows:First the two organic sulfonates 1,5 naphthalenedisulfonic acid(NDA)and fluorene-2,6-disulfonic acid disodium salt(AQDS)were used as modifiers for carbon nanotubes byπ-πconjugates preparated the non-covalent functionalized carbon nanotubes.At the same time as a polypyrrole dopant,a simple in-situ polymerization method is used to realize the composite of covalently modified carbon nanotubes and polypyrrole successfully prepared cerium-modified carbon nanotubes/polypyrrole core-shell nanocomposites.The analysis,discussion of the structure,morphology,and electrical properties was carried out by infrared spectroscopy,X-ray diffraction,SEM spectra,TEM spectra,and electrochemical workstation tests.It was found that changing the ratio of two sulfonates had a certain influence on the properties of the composites.The high proportion of AQDS can effectively improve the electrochemical performance of composites.In all composites,ANCP0.4 achieves the highest specific capacitance(393F/g),ideal supercapacitive characteristics and good cycle stability.It is related to the doping of core-shell nanostructures and electrically active carbon nanotubes uniformly coated with PPy on the surface of CNTs.Second the use of two organic sulfonates,potassium salt of 2,5-dihydroxybenzenesulfonate(HQS)and sodium arsenide-2-sulfonate(AQS),as a modifier of carbon nanotubes and a dopant for polyaniline,was successfully prepared Non-covalent modified carbon nanotube/polyaniline core-shell nanocomposites.The proportions of the two sulfonates were changed,and several groups of different experiments were compared to explore the effect of different ratios on the structure and electrical properties of the composites.The electrochemical performance of ACP and ACP4 is relatively good.This shows that the high proportion of AQS is more conducive to improving the electrical properties of the material.The core-shell structure of nanocomposites can be controlled and the electrochemical performance can be improved by changing the molar ratio of AQS/HQS.Finally the CNTs were epoxidized first,followed by a ring-opening reaction to prepare amino-hydrazone grafted carbon nanotubes.Synthesis of aminoanthraquinone-grafted carbon nanotubes/polyaniline nanocomposites by copolymerization of covalently modified carbon nanotubes with conductive polymer polyaniline at different mass ratios.Several groups of experimental samples were analyzed by infrared spectroscopy,XRD,and SEM for structure and morphology analysis.Electrochemical test was performed to analyze the electrochemical properties.The results showed that 20%wt CNT composites had relatively good electrochemical performance.Polyaniline polymerized on the surface of carbon nanotubes to form the core-shell structure of polyaniline-coated carbon nanotubes.The composite exhibited the best ultracapacitive properties when the AQ-CNT content was 20 wt%.After covalently modifying the carbon nanotubes,the composite material has a more solid structure and lays the foundation for improving its performance in various aspects. |
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