Nitrogen-doped graphene/nickel ferrite/polyaniline nanocomposite material and preparation method thereof

Abstract

The invention discloses a nitrogen-doped graphene / nickel ferrite / polyaniline nanometer composite material and a preparation method for the same. The preparation method comprises the following steps of ultrasonically dispersing graphite oxide in de-ionized water, and adding nickel nitrate and iron nitrate into the solution for stirring and dissolving; adding urea into the mixed solution for stirring and dissolving, performing reaction for a certain time under an oil bath condition, centrifugally washing a product to obtain a nitrogen-doped graphene / nickel ferrite nanometer composite material, and in-situ polymerizing polyaniline on the surface of the binary composite material serving as a matrix under an ice bath condition to obtain the nitrogen-doped graphene / nickel ferrite / polyaniline nanometer composite material. According to the nitrogen-doped graphene / nickel ferrite / polyaniline nanometer composite material and the preparation method for the same, graphene, nickel ferrite and polyaniline are compounded, so that the electrochemical performance (the specific capacitance reaches 1,290F / g, and is attenuated by about 7 percent after 5,000 cycles) of the composite material is greatly improved; when the energy density is 134.9WhKg<-1>, the corresponding power density reaches 6,337.5WKg<-1>, so that the composite material can be applied to energy storage devices with high power requirements.

Description

technical field [0001] The invention belongs to the field of nano-composite material preparation, and in particular relates to a nitrogen-doped graphene / nickel ferrite / polyaniline nano-composite material and a preparation method thereof. Background technique [0002] With the seriousness of the energy problem, the demand for energy storage devices has increased dramatically. As one of the energy storage devices, supercapacitors have also attracted extensive attention. The most important component of a supercapacitor is the electrode material with large specific capacitance and good mechanical stretchability. At present, the electrode materials for supercapacitors mainly include carbon materials, mixed metal oxides and conductive polymers. As a new type of carbon material, graphene has electric double layer capacitance and large specific surface area. Although carbon materials have a high specific surface area, their low capacitance limits the application of graphene in supe...

AI Technical Summary

Problems solved by technology

As a new type of carbon material, graphene has electric double layer capacitance and large specific surface area. Although carbon materials have a high specific surface area, their low capacitance limits the application of graphene in supercapacitors; Metal oxides and conductive polymers are used as electrode materials to store energy by Faraday pseudocapacitance generated by redox reactions. However, metal oxides are expensive and have a small specific surface area, and conductive polymers have low cycle stability. Therefore, it is difficult for a single type of electrode material to achieve the best energy storage performance of supercapacitors.

[0003] People such as Klaus Müllen doped nitrogen and boron simultaneously on the surface of graphene by hydrothermal method (Three-Dimensional Nitrogen and Boron Co-doped Graphene for High-Performance All-Solid-State Supercapacitors.Advanced Materials2012,24(37): 5130-5135.); Chinese patents (CN103274393A, CN102760866A, CN103359708A, CN103359711A and CN102167310A, etc.) introduce nitrogen sources through different chemical methods, and prepare nitrogen-doped graphene. Complex equipment, harsh reaction conditions, and low output are required; although the obtained nitrogen-doped graphene has improved its electrical conductivity compared with graphene, its electrochemical properties (such as Specific capacitance) is far from meeting the requirements of practical applications

[0004] Nickel ferrite is one of the ferrite metal oxides. It has been widely concerned because of its unique properties. However, nickel ferrite alone also has corresponding defects. In order to improve its performance, it is also necessary to combine it with carbon materials. It has become a research hotspot (Synthesis of graphene-NiFe2O4nanocomposites and their electrochemical capacitive behavior, Journal of Materials Chemistry A, 2013, 6393-6399.), but the prepared electrode materials cannot meet the requirements of real energy storage devices

Polyaniline with pseudocapacitance has a high specific capacitance, but its cycle life is poor, so a single electrode material cannot meet the needs of high-performance supercapacitors, so it has become a research topic to prepare multi-element composite electrode materials with carbon materials. Therefore, the research of multiple composite materials has become a research focus (Reduced-graphene oxide / molybdenum oxide / polyaniline ternary composite for high energy density supercapacitors: Synthesis and properties. Journal of Materials Chemistry, 2012.22(17): 8314-8320.A nanolinestructured graphene / polyaniline hybrid material for supercapacitors.Nanoscale, 2010.2(10):2164-2170.), but the electrochemical performance of the currently prepared binary or ternary composite materials still needs to be improved

[0005] So far, nitrogen-doped graphene / nickel ferrite / polyaniline nanocomposites have not been reported

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