Phosphomolybdic acid-polymer 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 new materials, and provides a phosphomolybdic acid-polymer composite conductive hydrogel, a preparation method thereof, and an application in an all-solid flexible supercapacitor. In a one-step in situ polymerization process, negatively charged phosphomolybdic acid and positively charged polymer conductive hydrogel are formed through electrostatic self-assembly and physical adsorption, and phosphomolybdic acid nanoparticles are uniformly anchored or embedded in each other. Connected 3D mesh structures on the surface or interior of polymer conductive hydrogels. Directly used as a binder-free supercapacitor electrode material to realize electrochemical energy storage. The uniform loading of phosphomolybdic acid improves the conductivity of the composite material, which is beneficial to the PMo 12 The uniform pinning and exposure of reactive active sites not only accelerates electron transport, but also the excellent ductility and swelling properties facilitate its application in flexible devices. When bent at a large angle, the flexible device 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 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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