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Composite graphene aerogel electrode, preparation method and application thereof

A technology of graphene airgel and composite graphene, applied in hybrid capacitor electrodes, hybrid/electric double-layer capacitor manufacturing, etc., can solve problems such as complex methods, aerogels without supercapacitors, etc., and achieve high mechanical stability , strong recovery elasticity, and broad application prospects

Active Publication Date: 2018-10-02
ANHUI UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the method of preparing polyhydroxy boron nitride by atom replacement is relatively complicated, and the airgel has not been applied to supercapacitors

Method used

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  • Composite graphene aerogel electrode, preparation method and application thereof
  • Composite graphene aerogel electrode, preparation method and application thereof
  • Composite graphene aerogel electrode, preparation method and application thereof

Examples

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preparation example Construction

[0034] A preparation method for a composite graphene airgel electrode, comprising the following steps:

[0035] 1) Cleaning of the electrode substrate: Cut the titanium sheet into a sample of 1cm×2cm, clean the sample with distilled water, ethanol, and acetone in sequence to remove surface impurities and oil, dry it in a vacuum drying oven, and then put it in nitrogen gloves spare in the box;

[0036] 2) Preparation of graphene hydrogel: first prepare 10mL concentration of 5mg·mL -1 Graphene oxide solution, at least two of ammonia, thiourea and boric acid are added to the graphene oxide solution to obtain a mixed solution, so that the mass ratio of GO to ammonia, thiourea and boric acid is 1: (0~ 1.14): (0 ~ 0.024): (0 ~ 0.0024), then the mixed solution is added to the reaction kettle and placed in an oven with a temperature of 90 ~ 150 ° C for 6 ~ 14 hours, and the hydrothermal reaction is carried out to obtain graphene water. gel;

[0037] 3) Dialysis of the graphene hydr...

Embodiment 1

[0042] A preparation method for a composite graphene airgel electrode, comprising the following steps:

[0043] 1) Cleaning of the electrode substrate: Cut the titanium sheet into a sample of 1cm×2cm, clean the sample with distilled water, ethanol, and acetone in sequence to remove surface impurities and oil, dry it in a vacuum drying oven, and then put it in nitrogen gloves spare in the box;

[0044] 2) Preparation of graphene hydrogel: first prepare 10mL concentration of 5mg·mL -1 Graphene oxide solution, then ultrasonic and magnetic stirring for 1h each, adding ammonia and thiourea and then magnetically stirring for 1h to obtain a mixed solution, wherein the mass ratio of GO to ammonia and thiourea was 1:1.14:0.012, and the mixed solution was added to the reaction Put it in the kettle and place it in an oven at 120°C, dry it for 6 hours, and obtain a graphene hydrogel after hydrothermal reaction;

[0045] 3) Dialysis of the graphene hydrogel: prepare a mixed dialysate of ...

Embodiment 2

[0051] A preparation method for a composite graphene airgel electrode, comprising the following steps:

[0052] 1) Cleaning of the electrode substrate: Cut the titanium sheet into a sample of 1cm×2cm, clean the sample with distilled water, ethanol, and acetone in sequence to remove surface impurities and oil, dry it in a vacuum drying oven, and then put it in nitrogen gloves spare in the box;

[0053] 2) Preparation of graphene hydrogel: first prepare 10mL concentration of 5mg·mL -1 Graphene oxide solution, then ultrasonic and magnetic stirring for 1h each, adding ammonia water and boric acid and magnetic stirring for 1h to obtain a mixed solution, so that the mass ratio of GO to ammonia water and boric acid was 1:1.14:0.0024, and then the mixed solution was added to the reaction kettle and placed in an oven with a temperature of 120° C. for 6 hours to perform a hydrothermal reaction to obtain a graphene hydrogel;

[0054] 3) Dialysis of the graphene hydrogel: prepare a mixe...

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Abstract

The invention discloses a composite graphene aerogel electrode. Aerogel is doped with at least two kinds of elements of nitrogen, boron and sulfur; a C-B bond, an N-B bond and a C-S bond are formed ina graphene structure, so that the aerogel electrode forms an atomic bridging layered porous structure; the mass specific capacitance of the aerogel electrode can be as high as 450F.g<-1>; the preparation method comprises the steps of 1) cleaning of an electrode substrate; 2) preparation of graphene hydrogel; 3) dialysis of graphene hydrogel; 4) preparation of graphene aerogel; and 5) preparationof the graphene aerogel electrode. The composite graphene aerogel electrode disclosed in the invention has high electrochemical activity; in addition, the graphene porous structure has very high elasticity recovery, so that the graphene aerogel has high mechanical stability. When the graphene aerogel electrode is used for a current collector of a supercapacitor, the mass specific capacitance can reach 450F.g<-1> at the current density of 2A.g<-1>, so that the composite graphene aerogel electrode has wide application prospect.

Description

technical field [0001] The invention relates to a composite graphene airgel electrode, a preparation method and application thereof, and belongs to the field of electronic material devices. Background technique [0002] Supercapacitor (SC), also known as electrochemical capacitor, is a new type of energy storage device between traditional capacitors and chemical power sources. Compared with traditional capacitors, it has higher specific capacitance and energy density, and compared with batteries. with higher power density. It has the advantages of short charging time, long cycle life, and wide applicable temperature range, and can be applied to energy storage devices, power supply systems, and electronic equipment. According to the different charge storage mechanisms and electrode materials, the commonly used types of SCs are: electrochemical double layer capacitors and pseudocapacitive capacitors. Electric double layer supercapacitors are currently the most widely used su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/32H01G11/26H01G11/86
CPCH01G11/26H01G11/32H01G11/86Y02E60/13
Inventor 曾玮王强卫宁梁栋徐超黄林生
Owner ANHUI UNIVERSITY
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