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Novel method for preparing magnetic oxide and perpendicular graphene array composite and application thereof to supercapacitor

A graphene array and magnetic oxide technology, which is applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., can solve the problem that the specific capacitance is only 230, only a few hundred Faradays per gram, etc., to improve the specific capacitance Effect

Active Publication Date: 2018-09-28
YUNNAN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

However, current studies report that the maximum specific capacitance that can be achieved by perovskite-type oxide electrode materials is often only a few hundred Faradays per gram, such as: using Sr-doped perovskite-type LaMnO 3-δ The electrode of the supercapacitor made of nanopowder has a specific capacitance of only 230F / g (X.W.Wang et al.Journal of Alloys and Compounds2016,675,195-200)

Method used

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  • Novel method for preparing magnetic oxide and perpendicular graphene array composite and application thereof to supercapacitor
  • Novel method for preparing magnetic oxide and perpendicular graphene array composite and application thereof to supercapacitor

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Embodiment 1

[0020] Embodiment 1 (the manganese base oxide with ferromagnetism is La 0.67 Sr 0.33 MnO 3 )

[0021] First, use graphene oxide with a sheet diameter in the range of 200-2000nm as the raw material, weigh graphene oxide and add deionized water to make a solution with a graphene concentration of 1mg / l, ultrasonically disperse for 2-20h, and the ultrasonic power is 500W. Stir the solution. Take the supernatant of the configured graphene oxide solution, dilute it into a solution of 0.5 mg / L, and add ferromagnetic La 0.67 Sr 0.33 MnO 3 The nanopowder was ultrasonically dispersed for 2 hours, and then stirred for 3 days to obtain a uniform dispersion solution, and the mass ratio of graphene oxide and nanopowder in the solution was in the range of 0.2. Then, transfer the solution to a round-bottomed flask, add hydrazine hydrate therein, the mass ratio of hydrazine hydrate to graphene oxide is 0.7-1, and then reflux in an oil bath at a temperature of 95° C. for 8 hours. Then fi...

Embodiment 2

[0023] Embodiment 2 (with magnetic iron base oxide is La 0.67 Sr 0.33 FeO 3 ):

[0024] First, use graphene oxide with a sheet diameter in the range of 200-2000nm as the raw material, weigh graphene oxide and add deionized water to make a solution with a graphene concentration of 1mg / l, ultrasonically disperse for 2-20h, and the ultrasonic power is 500W. Stir the solution. Take the supernatant of the configured graphene oxide solution, dilute it into a solution of 0.5 mg / L, and add ferromagnetic La 0.67 Sr 0.33 FeO 3 The nano-powder is ultrasonically dispersed for 0.5h, and then stirred for 3 days to obtain a uniform dispersion solution, and the mass ratio of graphene oxide and nano-powder in the solution is in the range of 0.2. Then, transfer the solution to a round-bottomed flask, add hydrazine hydrate therein, the mass ratio of hydrazine hydrate to graphene oxide is 0.7-1, and then reflux in an oil bath at a temperature of 95° C. for 8 hours. Then filter, wash, and v...

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Abstract

The invention provides a novel method for preparing a magnetic oxide and perpendicular graphene array composite. The nano-material preparation method is characterized by comprising the following steps: firstly, compounding graphene with a perovskite-type magnetic oxides (e.g. ferromagnetic La<0.67>Sr<0.33>MnO<3> nano-powder); uniformly dispersing the nano-powder on the surface of the monolayer graphite by taking the graphene as a skeleton; then applying an external magnetic field to a graphene / magnetic oxide composite; directionally aligning the magnetic oxide with the graphene under the action of the magnetic force of the magnetic field; and forming an array of the perpendicular graphene / magnetic oxide composite material on the surface of a conductive substrate. Through adoption of the method for preparing an electrode of the supercapacitor, preparation of a perpendicular graphite array and a perovskite-type oxide electrode material being highly and uniformly dispersed can be realizedat the same time; a composite supercapacitor with a double-layer capacitor and a pseudo-capacitor can be manufactured; and the energy density of the supercapacitor is increased.

Description

Technical field: [0001] The invention relates to a new preparation method for compounding a magnetic oxide and a vertical graphene array and its application in a supercapacitor, belonging to the field of supercapacitors. Background technique: [0002] A supercapacitor is a new type of power supply device, also known as an electrochemical capacitor, which is a capacitor that stores energy through an electrochemical process at the electrode / solution interface. new power supply unit. Compared with traditional energy storage devices, supercapacitors have faster charging and discharging speeds, longer service life, and high energy conversion efficiency, can be recycled, and are safe and environmentally friendly. In particular, the high specific power density of supercapacitors makes them extremely advantageous in applications such as electric vehicles and aerospace. However, compared with traditional secondary batteries and other energy storage devices, the energy density of su...

Claims

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Application Information

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IPC IPC(8): H01G11/30H01G11/32H01G11/46H01G11/86
CPCH01G11/30H01G11/32H01G11/46H01G11/86Y02E60/13
Inventor 熊飞郭长金王立凡王敏胡万彪
Owner YUNNAN UNIV
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