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Self-assembly preparation method and application of solid/liquid interface of graphene oxide hydrogel

A technology of graphene hydrogel and graphene airgel, which is applied in the self-assembly of solid-liquid interface of graphene oxide hydrogel, in the field of graphene oxide hydrogel, can solve problems such as energy consumption and achieve good mechanical properties performance, good electrochemical energy storage performance, simple and convenient preparation method

Active Publication Date: 2011-08-17
TIANJIN UNIV
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  • Application Information

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Problems solved by technology

Shi et al reported self-assembly by hydrothermal method to form partially reduced graphene oxide hydrogel [Yuxi Xu, Gaoquan Shi, et al.ACS Nano, 2010, 4324-4330], the gel has good mechanical performance and electrochemical performance, but the process of obtaining the hydrogel involves high temperature and high pressure. Although high temperature and high pressure can be scaled up in industry, it is undoubtedly a very energy-consuming operation.

Method used

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  • Self-assembly preparation method and application of solid/liquid interface of graphene oxide hydrogel

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Embodiment 1

[0015] The aluminum foil is electrochemically oxidized by a classic two-step anodic oxidation method to obtain a porous anodized aluminum film with a pore size distribution of 10-200nm. The specific process is to clean the aluminum foil with ultrasonic vibration in acetone and ethanol solvents for 10 minutes, and then soak it in 1mol / L sodium hydroxide to remove the natural oxide layer on the surface. Then electrochemical polishing was carried out in a solution of perchloric acid and ethanol with a volume ratio of 1:1, and the voltage was set at 12 V until the surface was mirror-smooth. At room temperature, in a sulfuric acid electrolyte of 0.3-1.2mol / L, with a voltage of 15-25V, another aluminum sheet with a larger area is used as a counter electrode to perform anodic oxidation treatment once, and then use a mass fraction of 1.8% The mixed solution of chromic acid and 6.0% phosphoric acid is soaked to remove the film. Carry out the second anodic oxidation again, and the oxid...

Embodiment 2

[0020] Present embodiment is identical with embodiment 1 process, just changes the add-on of graphite oxide: becomes 560mg by 80mg. The volume of the obtained graphene oxide hydrogel remained unchanged, but the water content of the hydrogel was reduced by 0.1%.

Embodiment 3

[0022] The process of this embodiment is the same as that of Embodiment 1, except that the ultrasonic power is changed from 120W to 300W. This process only changes the size of the graphene oxide sheet in the graphene oxide aqueous solution, and the volume and water content of the obtained graphene oxide hydrogel remain unchanged.

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Abstract

The invention discloses a self-assembly preparation method and application of a solid / liquid interface of graphene oxide hydrogel. The method comprises the following steps of: preparing graphite oxide powder and deionized water into a solution with the concentration of 1-7 mg / mL; and immersing a porous anodic alumina film or an aluminum sheet, an aluminum foil or a copper sheet treated by a mixed liquid of concentrated sulfuric acid and hydrogen peroxide in a water solution of graphene oxide at 0-80 DEG C to form graphene oxide hydrogel on the surface of the porous anodic alumina film, the aluminum sheet, the aluminum foil or the copper sheet. The graphene oxide hydrogel is used for preparing graphene oxide aerogel and graphene aerogel and is also a coating of the graphene oxide hydrogel. The preparation method provided by the invention is simple and does not require any high-temperature high-pressure process, and the water mass of the graphene oxide hydrogel is more than 99%.

Description

technical field [0001] The invention relates to a solid-liquid interface self-assembly preparation method and application of graphene oxide hydrogel, belonging to graphene oxide hydrogel technology. Background technique [0002] Graphene is receiving widespread attention for its excellent electron transport properties, thermal properties, mechanical properties, etc., and graphene oxide, as the precursor of graphene, has some special properties of its own, although it does not have the same physicist properties as graphene. widely concerned, but has been favored by chemists. A variety of oxygen-containing functional groups on the basal surface and edge of graphene oxide endow it with high chemical activity, in which carboxyl groups are mainly distributed on the edge of graphene oxide, and hydroxyl and epoxy groups are mainly distributed on the basal surface. The graphene oxide anions produced by the partial ionization of the carboxyl groups on the edge make it possible to fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 杨全红邵姣婧张少波吴思达吕伟
Owner TIANJIN UNIV
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