Phosphomolybdic acid/polymer/carbon nanotube composite conductive hydrogel and its preparation method and application in all-solid flexible supercapacitors

Abstract

The invention belongs to the technical field of multi-acid based composite hydrogel new materials, and provides a phosphomolybdic acid / polymer / carbon nanotube composite conductive hydrogel, a preparation method and an application in an all-solid flexible supercapacitor. Using the positively charged polymer conductive hydrogel as a bridge, the negatively charged phosphomolybdic acid is loaded on the negatively charged acidified carbon nanotubes in one step, and the construction of the ternary composite hydrogel is realized through electrostatic self-assembly. Phosphomolybdic acid nanoparticles are uniformly anchored or embedded on the surface of acidified carbon nanotubes wrapped by a polymer conductive hydrogel with a 3D grid structure. It can be directly used as a binder-free supercapacitor electrode material to realize electrochemical flexible energy storage. Good for PMo 12 The uniform pinning and exposure of reactive sites accelerates electron transport, and the excellent ductility and swelling properties facilitate its application in flexible devices. When bent at a large angle, it shows a very high capacitance retention rate, which shows great practicability 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.

Images