Preparation method for compounding three-dimensional graphene under assistance of L-cysteine

A cysteine ​​and graphene technology, applied in graphene, chemical instruments and methods, carbon compounds, etc., can solve problems such as complex preparation process, achieve simple preparation process, improve electrochemical performance, and non-toxic and harmless raw materials Effect

Inactive Publication Date: 2019-03-26
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

Chinese invention patent CN107759808A discloses the preparation method of sodium alginate / L-cysteine / reduced graphene oxide (rGO) magnetic water / airgel; Chinese invention patent CN103961343A discloses a kind of L-cysteine-oxidized Preparation method of graphene (GO) nanomaterials; the above-mentioned patent applications all have the problem that the preparation process is relatively complicated

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  • Preparation method for compounding three-dimensional graphene under assistance of L-cysteine

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[0025] A preparation method for L-cysteine ​​assisted synthesis of three-dimensional graphene, comprising the following steps:

[0026] 1) Disperse GO powder in ultrapure water and sonicate for 2h, and the sonication power is 70W to obtain 2mg / mL GO aqueous solution.

[0027] 2) Weigh L-cysteine ​​and add it to the GO aqueous solution in step 1), wherein the mass ratio of GO and L-cysteine ​​is 1:(5-20), and stir for 10 minutes.

[0028] 3) The mixed solution in step 2) was placed in an oil bath at 80° C. for 9 h, and then washed with deionized water and absolute ethanol for 4 to 6 times to obtain GO hydrogel.

[0029] 4) The GO hydrogel in step 3) was freeze-dried at -40°C for 48 hours to obtain GO aerogel.

[0030] 5) Calcining the GO airgel in step 4) at 750° C. for 2 h in an Ar atmosphere to obtain a three-dimensional rGO airgel.

Embodiment 1

[0033] 1) Disperse GO powder in ultrapure water and sonicate for 2 h to obtain 2 mg / mL GO aqueous solution.

[0034] 2) Weigh L-cysteine ​​and add it to the GO aqueous solution in step 1), wherein the mass ratio of GO and L-cysteine ​​is 1:5, and stir for 10 min.

[0035] 3) The mixed solution in step 2) was placed in an oil bath at 80° C. for 9 h, and then washed 4 times with deionized water and absolute ethanol to obtain GO hydrogel.

[0036] 4) The GO hydrogel in step 3) was freeze-dried for 48 hours to obtain GO aerogel.

[0037] 5) Calcining the GO airgel in step 4) at 750° C. for 2 h in an Ar atmosphere to obtain a three-dimensional rGO airgel.

Embodiment 2

[0039] 1) Disperse GO powder in ultrapure water and sonicate for 2 h to obtain 2 mg / mL GO aqueous solution.

[0040] 2) Weigh L-cysteine ​​and add it to the GO aqueous solution in step 1), wherein the mass ratio of GO and L-cysteine ​​is 1:15, and stir for 10 min.

[0041] 3) The mixed solution in step 2) was placed in an oil bath at 80° C. for 9 h, and then washed five times with deionized water and absolute ethanol to obtain GO hydrogel.

[0042] 4) The GO hydrogel in step 3) was freeze-dried for 48 hours to obtain GO aerogel.

[0043] 5) Calcining the GO airgel in step 4) at 750° C. for 2 h in an Ar atmosphere to obtain a three-dimensional rGO airgel.

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Abstract

The invention discloses a preparation method for compounding three-dimensional graphene under the assistance of L-cysteine. The preparation method comprises the following steps: firstly, dispersing GOpowder into ultrapure water and ultrasonically treating, thereby acquiring a GO aqueous solution; adding L-cysteine into the GO aqueous solution and uniformly stirring, thereby acquiring a mixed solution, wherein the mass ratio of GO to L-cysteine is at 1:(5-20); treating the mixed solution in oil bath, and then respectively using deionized water and absolute ethyl alcohol for repeatedly washing,thereby acquiring a GO hydrogel; freeze-drying the GO hydrogel, thereby acquiring a GO aerogel; calcining the GO aerogel under inert atmosphere, thereby acquiring a rGO aerogel with a three-dimensional structure, namely, three-dimensional graphene. According to the invention, L-cysteine is utilized to assist in compounding three-dimensional rGO; preparation process is simple; raw materials are nontoxic and harmless; the preparation method has a bright application prospect in the field of energy storage.

Description

technical field [0001] The invention belongs to the technical field of inorganic material preparation, and in particular relates to a preparation method for L-cysteine-assisted synthesis of three-dimensional graphene. Background technique [0002] The diversification of electronic products and the development of electric vehicles have promoted the upsurge of research workers on lithium-ion batteries. Because of its high energy density, long cycle life, no memory effect and no environmental pollution, it is widely used in mobile phones, areas such as notebook computers and hybrid vehicles. [0003] As a typical two-dimensional material, graphene has an ultra-high theoretical specific surface area, good chemical stability, excellent electrical conductivity and mechanical properties, and is an ideal energy storage material. However, graphene is easy to agglomerate and stack, which limits its application. [0004] Compared with two-dimensional graphene, three-dimensional graph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184
CPCC01B2204/22C01B2204/32C01P2004/03C01B32/184
Inventor 霍京浩薛雨佳白培杰郭守武
Owner SHAANXI UNIV OF SCI & TECH
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