A kind of nitrogen-doped carbon nanotube/cobalt tetroxide composite airgel and its preparation method and application

Abstract

The invention discloses a nitrogen-doped carbon nanotube / cobalt tetroxide composite airgel. The polypyrrole airgel is modified by the self-polymerization of dopamine, and cobalt ions are effectively adsorbed by the amino group and hydroxyl group of polydopamine to realize polypyrrole. The airgel is fully compounded with ZIF-67, and then fired at high temperature. The present invention effectively coordinates and adsorbs cobalt ions through the amino groups and hydroxyl groups of polydopamine, realizes the effective compounding of polypyrrole nanotube airgel and ZIF-67, and then performs high-temperature calcination to realize nitrogen doping of carbon nanotubes, and the composite airgel The three-dimensional structure of cobalt tetroxide can effectively disperse the nanoparticles of tricobalt tetroxide; the obtained nitrogen-doped carbon nanotubes / cobalt tetroxide composite airgel effectively utilizes the porous framework structure of the aerogel, and can effectively combine the electric double layer capacitance of nitrogen-doped carbon nanotubes with cobalt trioxide The pseudocapacitance, which facilitates electron or ion transport, is an ideal electrode material for supercapacitors.

Description

technical field [0001] The invention belongs to the fields of airgel materials and supercapacitor electrode materials, and in particular relates to a nitrogen-doped carbon nanotube / cobalt tetroxide composite airgel and a preparation method and application thereof. Background technique [0002] Supercapacitors have the advantages of high power density, long cycle life, and large specific capacity. They are a new type of energy storage device superior to traditional capacitors and ordinary batteries. They are widely used in electronic products, electric vehicles, railways, and aerospace. An ideal supercapacitor electrode material should have a high specific surface area, rich and evenly distributed pore structure, high electrical conductivity, and good solution wettability, so as to ensure sufficient charge storage space to facilitate the rapid transport of electrolyte ions and promote Electrolyte diffusion to improve specific capacitance, rate performance and long-term stabil...

AI Technical Summary

Problems solved by technology

[0003] Conductive polymer gel is a new type of supercapacitor electrode material that has been widely reported. However, the force of the conductive polymer is uneven during the charging and discharging process, and the polymer chain skeleton of the conductive polymer is in a reversible doping / dedoping process. There is a certain degree of volume expansion and contraction in the supercapacitor, which will affect the long-term cycle life of the supercapacitor.