Graphite felt electrode material loaded with iron phosphate/polyaniline, preparation method and application

Abstract

Graphite felt electrode material loaded with iron phosphate / polyaniline, a preparation method and application are provided. Pre-oxidized graphite felt is used as a base material. Iron phosphate microspheres with an average particle diameter of 10-20 [mu]m are connected in series to pre-oxidized graphite felt fibers with an average diameter of 6-8 [mu]m. The polyaniline is intercalated into the iron phosphate microspheres in an amorphous state and adhere to the surfaces of the iron phosphate microspheres and the pre-oxidized graphite felt fibers. The method comprises (1) placing the pre-oxidized graphite felt in an aqueous solution of ferric salt, adding an aqueous solution of dihydrogen phosphate, and performing hydrothermal reaction, cooling, washing, and drying; (2) using the graphite iron felt loaded with iron phosphate as a working electrode, using a phosphoric acid solution as an electrolyte, adding the aqueous aniline solution to the electrolyte, and performing electropolymerization, washing and drying to obtain the graphite felt electrode material. The invention also discloses the use of the material. The material of the invention has high specific capacity, good energy storage performance, a high capacity retention rate and good cycle performance. The method is simple, mild in conditions low in cost, and suitable for industrial production.

Description

technical field [0001] The invention relates to an electrode material, a preparation method and an application, in particular to a graphite felt electrode material loaded with iron phosphate / polyaniline, a preparation method and an application. Background technique [0002] With the continuous exploitation and consumption of energy materials mainly based on fossil fuels, the global energy crisis has become increasingly prominent. Therefore, it is extremely important to develop and utilize new energy systems and develop corresponding high-efficiency energy storage materials. A supercapacitor is an energy storage device whose performance is between that of a secondary battery and an ordinary capacitor. Because it has both the high energy density of a secondary battery and the high power density of a capacitor, it has fast charge and discharge speeds, long cycle life, and is suitable for high temperature The obvious comprehensive advantages such as wide range have attracted gr...

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Problems solved by technology

[0004] Currently widely used pseudocapacitive energy storage materials are mainly divided into two categories: transition metal compounds and conducting polymers, such as RuO 2 It has superior properties such as high capacity and long life in acidic systems, but due to the lack of precious metal Ru resources and high price, its large-scale use is limited; and conductive polymers have the advantages of flexibility, light weight and adjustable conductivity. , but its specific capacity is low, especially its poor cycle stability

[0005] CN103794380A and CN103560017A disclose a polyaniline (polypyrrole) / graphite felt composite electrode and a preparation method thereof, in which polyaniline or polypyrrole are respectively supported on flexible graphite felt by an electrochemical method to obtain a pseudocapacitive energy storage electrode material , but its specific capacity index is still low, that is, the specific capacity of the polyaniline / graphite felt composite electrode is only 696.6F / A at a current density of 1A / g; the polypyrrole / graphite felt composite electrode is at a current density of 1A / g, The specific capacity is only 658F / A

Although it has good electrochemical performance, this method uses organic solvent NMP and non-conductive binder PVDF, which is similar to the processing and molding method of traditional electroactive powder materials, and the loading process is more complicated.

[0009] CN106532076A discloses a preparation method of loading sulfonated polyaniline on graphite felt for biofuel cell electrodes, but it still uses non-conductive macromolecular PVDF as a binder and a method of drying and loading after ultrasonic dispersion , also has the defects of long preparation steps and complicated process

[0010] CN 102760888A discloses a preparation method for graphene / substrate electrode and polyaniline-graphene / substrate electrode for biofuel cells, but the preparation process is a physical adsorption loading method in which active material dispersion aqueous solution is added dropwise on the substrate, There are technical defects such as poor controllability of the loading process, poor batch reproducibility, and insufficient loading firmness, which hinder further application

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