Three-dimensional porous graphene electrode and preparation method thereof

A graphene electrode, three-dimensional porous technology, applied in the field of material science, can solve problems such as insufficient mechanical strength, complicated preparation process, and wire detachment, and achieve the effect of superior electrode performance, simple preparation process, and low mass transfer resistance

Inactive Publication Date: 2015-12-09
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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Examples

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Effect test

Embodiment 1

[0023] A method for preparing a three-dimensional porous graphene electrode includes the following steps:

[0024] (1) Preparation of graphite oxide powder: take 0.5g of flake graphite that has passed a 100-mesh sieve, and 0.6g of KNO 3 Mix, add 23mL concentrated sulfuric acid under stirring, slowly add 1.5g potassium permanganate after stirring for 10min, then place the mixture at 35℃ and stir for 3h, then drop 40mL deionized water, continue stirring for 5min, add 100mL deionized Water and 3mL 30% H 2 O 2 The solution is then filtered. After filtering, wash the filter cake with 1mol / L hydrochloric acid until it is BaCl 2 SO4 cannot be detected in the solution 2- Then, it was washed with water to neutrality, and vacuum freeze-dried to obtain graphite oxide powder. The vacuum freeze-drying was carried out at -50°C for 24h.

[0025] (2) Preparation of graphene oxide aqueous dispersion: Disperse 0.4 g of graphite oxide powder in 100 mL of deionized water, and use an ultrasonic instru...

Embodiment 2

[0031] A preparation method of a three-dimensional porous graphene electrode. The difference from Example 1 is that 0.6 g of graphite oxide is dispersed in 100 mL of deionized water, followed by ultrasonic peeling at 400 W for 3 hours, and 1.2 mL of 85% by mass hydrazine hydrate is added at 80°C. The reaction was allowed to stand for 2 hours and at room temperature for 12 hours to obtain a water-containing graphene polymer, which was pre-frozen at -50°C for 48 hours and freeze-dried in vacuum at -50°C for 48 hours.

Embodiment 3

[0033] A preparation method of a three-dimensional porous graphene electrode. The difference from Example 1 is that 0.5g of graphite oxide is dispersed in 100mL of deionized water, 400W ultrasonic stripping for 3h, and 1.0mL of hydrazine hydrate with a mass concentration of 85% is added at 90°C. The reaction was allowed to stand for 1 hour and at room temperature for 6 hours to obtain a water-containing graphene polymer, which was pre-frozen at -50°C for 36 hours and freeze-dried in vacuum at -50°C for 24 hours.

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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...

Claims

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Application Information

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IPC IPC(8): C01B31/04H01M4/88H01M4/96H01M8/16
CPCY02E60/50
Inventor 李秀芬黄力华任月萍王新华
Owner JIANGNAN UNIV
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