A ferrite@graphene hydrogel composite material and its application in the field of electrochemical energy storage

A technology of graphene hydrogel and composite materials, which is applied in the field of new functional materials and electrochemical energy storage, can solve the problems of difficult control of material morphology and performance, undisclosed related performance, complicated operation process, etc., and achieve improved electrochemical performance. Energy storage performance, convenient operation and low cost

Active Publication Date: 2019-06-14
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But ferrite also has obvious disadvantages: poor conductivity and small specific surface area
Composite materials are prepared by a two-step hydrothermal method, and the operation process is complicated, which makes it difficult to control the shape and performance of the material; the patent does not disclose the relevant performance of this type of material in the field of electrochemical energy storage

Method used

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  • A ferrite@graphene hydrogel composite material and its application in the field of electrochemical energy storage
  • A ferrite@graphene hydrogel composite material and its application in the field of electrochemical energy storage
  • A ferrite@graphene hydrogel composite material and its application in the field of electrochemical energy storage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1)CoFe 2 O 4 @Graphene Hydrogel Composite Material Preparation

[0036] 1mmol Co(NO 3 ) 3 , 2mmol Fe(NO 3 ) 3 Mix with 5mmol of sodium acetate, and add 25mL of ethylene glycol to fully stir; then mix with 33mL of graphene oxide with a concentration of 3.5g / L, fully stir and add to the reactor, increase the temperature to 180°C, and keep it for 12 hours. After the reaction, the gel was taken out and washed with a lot of water to obtain CoFe 2 O 4 @Graphene hydrogel composite materials.

[0037] Attached figure 1 Is the prepared CoFe 2 O 4 @Graphene Hydrogel composite X-ray diffraction pattern. It can be seen from XRD that diffraction peaks appear at 18.3, 30.1, 35.4, 37.1, 43.1, 53.4, 57.0, 62.6 and 74.0° positions, and these diffraction peaks can correspond to CoFe 2 O 4 (111), (220), (311), (222), (400), (331), (422), (511), (400) and (533) crystals in (JCPDS no.22-1086) The above shows that what we have prepared is cobalt ferrite with spinel structure.

[0038] Attached ...

Embodiment 2

[0043] (1)NiFe 2 O 4 @Graphene Hydrogel Composite Material Preparation

[0044] 1mmol Ni(NO 3 ) 3 , 2mmol Fe(NO 3 ) 3 Mix with 4.6mmol of sodium acetate and add 25mL of ethylene glycol to fully stir; then mix with 26mL of 5g / L graphene oxide solution, fully stir and add to the reactor, warm to 220°C, and keep for 10 hours. After the reaction, the gel was taken out and washed with a large amount of water to obtain NiFe 2 O 4 @Graphene hydrogel composite materials.

[0045] Attached Figure 7 Is NiFe 2 O 4 Nano material and NiFe prepared by the invention 2 O 4 @Graphene composite materials at low temperature nitrogen adsorption test results (BET and BJH). From the obtained test results, the NiFe obtained by the present invention can be calculated 2 O 4 @Graphene composite material has a specific surface area of ​​614.4m 2 / g, than NiFe 2 O 4 Nano materials (179.7m 2 / g.) 3.4 times higher.

[0046] (2)NiFe 2 O 4 @Reduced graphene oxide composite electrode preparation

[0047] The prepar...

example 3

[0048] Example 3: Manganese Ferrite@Graphene Hydrogel Composite

[0049] (1) MnFe 2 O 4 @Graphene Hydrogel Preparation

[0050] 1mol Mn(NO 3 ) 3 , 2mol Fe(NO 3 ) 3 Mix with 4mol sodium acetate, and add 16mL ethylene glycol to fully stir; then mix with 25mL of 4.5g / L graphene oxide solution, fully stir and add into the reactor, warm to 160°C and keep for 18 hours. After the reaction, the gel was taken out and washed with a large amount of water to obtain MnFe 2 O 4 @Graphene hydrogel composite materials.

[0051] Attached Figure 8 MnFe prepared by the invention 2 O 4 @Graphene composite electron transmission image and EDX, you can also see MnFe 2 O 4 Nano particles are more uniformly dispersed and compounded on the graphene sheet.

[0052] (2) MnFe 2 O 4 @Graphene composite electrode preparation

[0053] The prepared MnFe 2 O 4 @Graphene hydrogel composite material, after freeze-drying, is pressed on a foamed nickel electrode of a certain size, used as the electrode material of superc...

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Abstract

The invention discloses a ferrite@graphene hydrogel composite material and application of the ferrite@graphene hydrogel composite material to the electrochemical energy storage field. According to themethod, the preparation of a ferrite nanomaterial by a one-step hydrothermal method and the combination of the ferrite nanomaterial and graphene hydrogel in the same reaction tank are completed withone step, calcination being not required. The method has simplicity, is convenient to operate and is low in material preparation cost. For the first time, such as a bimetallic oxide as the ferrite iscombined with the ferrite nanomaterial, so that the composite material can be obtained. The obtained composite material can be used for electrochemical energy storage; and the electrochemical energy storage property of a composite material electrode is excellent, and the performance of the composite material electrode is stable.

Description

Technical field [0001] The invention belongs to the technical field of new functional materials and electrochemical energy storage, and relates to a graphene hydrogel composite material, and specifically refers to a method for preparing a graphene hydrogel with a three-dimensional pore structure composited with ferrite nanomaterials and Its application, the material can be applied in the field of electrochemical energy storage, especially as an electrode material for supercapacitors. Background technique [0002] Supercapacitors, a new type of electrochemical energy storage device, are considered to be the most promising and clean energy conversion and storage device with high power density, long cycle life, fast charging speed, safety and pollution-free, and operating temperature range The advantages of wide and green environmental protection have broad application prospects in the fields of electric vehicles, mobile communications, aerospace, information technology and high-pow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/32H01G11/86
CPCH01G11/32H01G11/86H01M2004/023Y02E60/10
Inventor 郑华均杨光
Owner ZHEJIANG UNIV OF TECH
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