Preparation of polyaniline/polypyrrole composite nano fiber electrode materials with core-shell structure

Abstract

The invention relates to preparation of polyaniline / polypyrrole composite nano fiber electrode materials with core-shell structure, comprising the following steps: (1) respectively dissolving aniline and an aniline monomer initiator into a polyaniline doping agent, then merging the mixed liquor, shaking the mixed liquor to ensure the mixed liquor to react under room temperature, centrifuging and washing the reactants to obtain fibers; and (2) adding the fibers to a polypyrrole doping agent, carrying out ultrasonic dispersion and adding a pyrrole monomer under ultrasonic action, then dropwise adding the polypyrrole doping agent solution of a pyrrole monomer initiator, keeping the system temperature at 0-5 DEG C to react, centrifuging and washing the products and drying the products, thus obtaining the electrode materials. The method is simple, low in cost and suitable for industrial production. The obtained materials show higher specific capacitance and good chemical performance stability when being used in super capacitors.

Description

technical field [0001] The invention belongs to the field of preparation of composite nanofiber electrode materials, in particular to a method for preparing polyaniline / polypyrrole composite nanofiber electrode materials with a core-shell structure. Background technique [0002] Supercapacitor is a new type of energy storage device, which has the characteristics of short charging time, long service life, good temperature characteristics, energy saving and environmental protection. Supercapacitors have great application value and market potential in many fields such as electric vehicles, hybrid fuel vehicles, special trucks, electric power, railways, communications, national defense, and consumer electronics. Conducting polymers have attracted great attention due to their fast electrochemical charge-discharge kinetics (that is, rapid doping and dedoping processes), charge storage throughout the material volume, and lower cost than noble metal oxides. Among them, polyaniline ...

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Problems solved by technology

However, although these existing methods have achieved success in the preparation of conductive polymer nanofibers, there are more or less disadvantages, such as the need to use organic solvents in the interfacial polymerization method, the synthesis yield is low, and the need for organic solvents Recycling is carried out to avoid environmental pollution; the template method generally has a high production cost, and the template needs to be removed when preparing the electrode; a large amount of emulsifier is often used in the reaction process of the emulsion polymerization method, and the post-treatment process is cumbersome; and the electrochemical polymerization method requires conductive substrates , the synthetic product is limited by the electrode area

It is worth mentioning that when used as an electrode material for a supercapacitor, a single-component conductive polymer can only exhibit excellent electrochemical performance in acidic or alkaline electrolytes. For example, polyaniline is more suitable for acidic electrolysis. Polypyrrole is more suitable for alkaline electrolyte, although polypyrrole can also be used for neutral electrolyte, but it often performs poorly in non-corrosive neutral electrolyte

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