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

Abstract

The invention belongs to the technical field of polyacid group composite new materials, and provides a phosphomolybdic acid-polymer composite conductive hydrogel, a preparation method thereof and application of the phosphomolybdic acid-polymer composite conductive hydrogel in an all-solid-state flexible super capacitor. In the process of one-step in-situ polymerization, the phosphomolybdic acid-polymer composite conductive hydrogel is formed through the electrostatic self-assembly effect and the physical adsorption effect of phosphomolybdic acid with negative electricity and a polymer conductive hydrogel with positive electricity, and phosphomolybdic acid nanoparticles are uniformly anchored or embedded in the surface or interior of the polymer conductive hydrogel with an interconnected 3Dgrid structure; the phosphomolybdic acid-polymer composite conductive hydrogel is directly used as a super capacitor electrode material without an adhesive, and electrochemical energy storage is realized; and electrical conductivity of a composite material is improved through the uniform load of phosphomolybdic acid, uniform pinning of PMo<12> and exposure of reactive active sites are facilitated, electronic transmission is accelerated, and excellent ductility and the swelling property facilitate application of the phosphomolybdic acid-polymer composite conductive hydrogel to a flexible device. When the bending angle is large, the flexible device shows a super-high capacitance retention rate, and great practicability is shown in the field of integrated flexible electronic devices.

Description

technical field [0001] The invention belongs to the technical field of multi-acid-based composite new materials, and specifically relates to a phosphomolybdic acid-polymer composite conductive hydrogel, a preparation method thereof, and an application in an all-solid flexible supercapacitor. Background technique [0002] PMo 12 Due to its fast and reversible multi-electron transport ability, unique crystal structure and stable redox valence state, it has become a widely researched hotspot material in pseudocapacitors based on surface faradaic reactions. However, PMo 12 It is easily soluble in water and polar organic solvents, and has poor conductivity, so it cannot be used alone as an active electrode material. [0003] In the past ten years, scientists have been working hard to find suitable conductive substrates and PMo 12 compounding to maximize its inherent capacitance. So far, the conductive substrates reported at home and abroad mainly include some common carbon ma...

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Problems solved by technology

However, the introduction of additional binders, the agglomeration of the base carbon material and the PMo 12 Issues such as the limited exposure of redox active sites have inhibited the PMo 12 Effective use of intrinsic capacitance

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