Three-dimensional porous graphene electrode and preparation method thereof

Abstract

The invention relates to a three-dimensional porous graphene electrode and a preparation method thereof. The preparation method includes following steps: (1) dispersing a certain quantity of graphite oxide powder in deionized water, performing ultrasound stripping to prepare homogeneous graphene oxide water dispersion liquid; (2) adding a hydrazine hydrate solution to the graphene oxide water dispersion liquid, successively performing a high-temperature short-time and a room-temperature long-time polymerization reactions to obtain a water-containing graphene polymer; (3) freeze-drying the water-containing graphene polymer to obtain three-dimensional porous graphene; and (4) cutting the three-dimensional porous graphene to obtain the electrode or directly employing the three-dimensional porous graphene as the electrode. In the invention, by means of the oxidation-reduction method, the polymerization reactions are carried out under a high graphene oxide concentration, so that single-layer graphene nano sheets are closed to eath other and are combined together through Van der waals force to form monolithic three-dimensional porous graphene, thereby preparing the electrode. The electrode has enough mechanical strength, is large in specific surface area and is excellent in performance.

Description

Technical field [0001] The invention relates to a graphene electrode and a preparation method thereof, and belongs to the field of materials science. Background technique [0002] Graphene is made up of carbon atoms through sp 2 Hybrid, a single layer of two-dimensional crystalline materials arranged in a honeycomb shape. The light transmittance of single-layer graphene can reach 97.7%, the Young's modulus can reach lTPa, the electrons in graphene move at 1 / 300 of the speed of light, and the migration rate is up to 2×10 5 cm 2 / (V·s), the thermal conductivity is 5300W / (m·K), and the theoretical specific surface area of ​​graphene is 2600m 2 / g, these properties give the material a solid application basis, and more and more researches apply it to electrode materials. [0003] However, the currently prepared two-dimensional graphene cannot be used as an electrode alone. It only serves as a surface modifier. That is, graphene needs to be modified on the surface of other electrodes, an...

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Problems solved by technology

[0004] At present, there have been reports on the preparation of three-dimensional porous graphene electrodes, but most of the preparation processes are complex and require precursors as a guide, or the prepared three-dimensional porous graphene electrodes such as graphene airgel or graphene sponge, the mechanical strength Insufficient, when used as an electrode, first, it is easy to separate from the wire, resulting in an increase in resistance; second, external force is easy to cause deformation or damage to the electrode