Phosphomolybdic acid/polymer/carbon nanotube composite conductive hydrogel, preparation method thereof and application thereof in all-solid-state flexible super capacitor

Abstract

The invention belongs to the technical field of new polyacid-based composite hydrogel materials and provides phosphomolybdic acid/polymer/carbon nanotube composite conductive hydrogel, a preparation method thereof and application thereof in an all-solid-state flexible super capacitor. Positively charged polymer conductive hydrogel is used as a bridge, negatively charged phosphomolybdic acid is loaded on negatively charged acidified carbon nanotubes in situ in one step, ternary composite hydrogel is constructed through an electrostatic self-assembly effect, and phosphomolybdic acid nanoparticles are uniformly anchored or embedded in surfaces of the acidified carbon nanotubes wrapped by the polymer conductive hydrogel with a 3D grid structure. The composite conductive hydrogel can be directly used as an adhesive-free supercapacitor electrode material to realize electrochemical flexible energy storage. Uniform pricking of PMo12 and exposure of reaction active sites are facilitated, the electron transmission is accelerated, and the application of the composite conductive hydrogel in a flexible device is promoted due to excellent ductility and swelling property. When the bending angle is large, an extremely high capacitance retention rate is displayed, and great practicability is displayed in the field of integrated flexible electronic devices.

Description

technical field [0001] The invention belongs to the technical field of multi-acid-based hydrogel composite new materials, and specifically relates to a phosphomolybdic acid / polymer / carbon nanotube composite conductive hydrogel, a preparation method and an application in an all-solid flexible supercapacitor. Background technique [0002] Polyoxometalates (POMs) are a class of polyoxometallic cluster compounds formed by the connection of pre-transition metal ions through oxygen. Stability has been widely used in the field of energy storage. Among them, Keggin-type phosphomolybdic acid (PMo 12 ) is known as "electron sponge" because of its strong electron transfer ability. However, PM 12 There are disadvantages such as being easily soluble in water and polar solvents, so that it cannot be directly used as an electrode material, which limits its application in the field of energy storage. [0003] In order to solve the above problems, the scientists adopted PMo 12 Uniformly...

AI Technical Summary

Problems solved by technology

However, the comprehensive coating of traditional conductive polymers is not conducive to the exposure of active sites, which limits the intrinsic capacitance of POMs; at the same time, the polymer is a rigid structure, and the electrochemical performance of the material is reduced due to the volume change of the electrode during the test.

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