Oxidized graphene/pure graphene/polyaniline ternary conductive composite material and preparation method thereof

Abstract

The invention discloses an oxidized graphene / pure graphene / polyaniline ternary conductive composite material and a preparation method thereof. The preparation method comprises the following steps: directly mixing oxidized graphene dispersion liquid and pure graphene dispersion liquid and carrying out ultrasonography, and carrying out ultrasonic dispersion in water after centrifugal washing to obtain a water-phase dispersion system of oxidized graphene / pure graphene; firstly adding an aniline monomer solution containing HCl in the system, then adding an ammonium persulfate solution, carrying out a stirring reaction for more than 8 h, and carrying out ultrasonic dispersion after vacuum filtration and washing to obtain the ternary composite material. Oxidized graphene prepared through oxidoreduction and pure graphene through liquid-phase peeling are compounded firstly, aniline monomers are polymerized in situ, the pure graphene with smaller size in the obtained compound is attached onto the oxidized graphene with larger size and more wrinkles like patches, aniline nanoparticles are uniformly dispersed between two graphene substrates, and a capacitor assembled by adopting the composite film has excellent specific electric-capacity and higher recycle performance.

Description

technical field [0001] The invention relates to a graphene oxide / pure graphene / polyaniline ternary conductive composite material and a preparation method thereof, belonging to the field of supercapacitor composite material preparation. Background technique [0002] Supercapacitors, namely electrochemical capacitors (ECs), have the advantages of stable performance, high specific capacitance, long cycle life (up to 100,000 times), fast charging and discharging speed, economical and environmental protection, etc. Moreover, supercapacitors have a higher energy density than conventional capacitors. Today, supercapacitors have shown broad market application prospects in the fields of home electronics, electric vehicles, communication technology, and solar energy devices. [0003] Supercapacitors can be divided into two types according to their energy storage mechanism: one is an electric double layer capacitor, and the other is a Faraday quasi-capacitor. The electrode materials ...

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Problems solved by technology

Graphene in the currently reported graphene / polyaniline composite materials is generally obtained by oxidation-reduction of graphite. The graphene prepared in this way has a large structural defect, and some oxygen-containing functional groups will remain to affect its conductivity. More importantly, Partial re-accumulation of graphene is inevitable during the reduction process of graphene oxide

Recently, pure graphene prepared by liquid phase exfoliation has aroused people's research interest because of its defect-free and non-functional groups, but the disadvantage is that its water solubility is very poor, and it will coagulate as soon as it encounters water.

Moreover, the sheets of pure graphene are generally small, only a few hundred nanometers and have a smooth surface, which is not conducive to the synthesis of graphene-based materials (document: Asimpleandpracticalroutetoprepareuseablepristinegrapheneforelectrochemicalapplications, ChemicalEngineeringJournal)

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