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A kind of three-dimensional graphene bifunctional oxygen electrode catalyst and preparation method thereof

A graphene, bifunctional technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of poor stability, limited application range, slow kinetics, etc., and achieve good electrical conductivity and Mechanical properties, improved electrochemical performance, and the effect of increasing active sites

Inactive Publication Date: 2018-10-23
CHANGCHUN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in terms of bifunctional oxygen electrode catalyst materials, people have studied a variety of different catalysts, such as noble metal bifunctional oxygen electrode catalysts, single metal bifunctional oxygen electrode catalysts, metal organic compound bifunctional oxygen electrode catalysts, etc. Bifunctional oxygen electrode catalysts prepared by mixing powders, such as platinum-based bifunctional oxygen electrode catalysts, have high oxygen reduction reaction activity, but platinum-based bifunctional oxygen electrode catalysts have poor oxygen evolution reaction performance, slow kinetics, and resistance to methanol cross-effect Low, prone to carbon monoxide poisoning, poor stability, and high cost of use; noble metal bifunctional oxygen electrode catalysts for oxygen evolution reaction represented by ruthenium dioxide and iridium dioxide have low oxygen reduction reaction activity, limited storage capacity, and high cost of use. problem, the scope of application is limited

Method used

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  • A kind of three-dimensional graphene bifunctional oxygen electrode catalyst and preparation method thereof
  • A kind of three-dimensional graphene bifunctional oxygen electrode catalyst and preparation method thereof
  • A kind of three-dimensional graphene bifunctional oxygen electrode catalyst and preparation method thereof

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preparation example Construction

[0059] The present invention also provides a method for preparing the three-dimensional graphene bifunctional oxygen electrode catalyst described in the above technical solution, comprising the following steps:

[0060] (1) mixing graphite oxide, cobalt precursor, aluminum precursor, nitrogen precursor, templating agent and alkaline regulator to obtain a mixed solution;

[0061] (2) carry out hydrothermal reaction to the mixed solution that described step (1) obtains, obtain the three-dimensional graphene hydrogel of cobalt-heteroatom tailoring;

[0062] (3) washing and drying the three-dimensional graphene hydrogel that described step (2) obtains, obtains three-dimensional graphene aerogel;

[0063] (4) calcining the three-dimensional graphene airgel obtained in the step (3) to obtain a cobalt-heteroatom-tailored three-dimensional graphene bifunctional oxygen electrode catalyst.

[0064] The invention mixes graphite oxide, cobalt precursor, aluminum precursor, nitrogen precu...

Embodiment 1

[0087] Weigh 2 grams of graphite powder and 2 grams of sodium nitrate, add them to a 1-liter three-neck flask and stir, slowly add 169.28 mg of concentrated sulfuric acid and 12 grams of potassium permanganate in an ice-water bath . Transfer the three-neck flask to a constant temperature hot water bath at 35°C and stir for 1 hour, slowly add 160 mg of deionized water to the ice water bath, and transfer to a constant temperature water bath at 90°C to stir for 0.5 hours, then add 400 mg of deionized water and 17.76 mg of 30% hydrogen peroxide. After standing overnight, pour off the supernatant, filter with suction, dissolve the filter cake and put it into a dialysis bag for dialysis until the pH is 7.02, and then place it in an oven at 60°C to dry to obtain graphite oxide.

[0088] Disperse 55 mg of graphite oxide in 7 mg of deionized water, and ultrasonically disperse it uniformly to obtain a uniformly dispersed graphite oxide aqueous solution.

Embodiment 2

[0090] Weigh 495 mg of melamine, 325 mg of sodium chloride, and 32 mg of ethanol, and add them to 30 mg of the graphite oxide aqueous solution of Example 1 at the same time, heat and stir in a constant temperature water bath at 40°C for 6 hours, and then add 4.54 mg of Ammonia, adjust the pH value of the mixture to 12. The mixture was transferred to a reaction kettle and reacted in an oven at 180°C for 12 hours, then cooled to room temperature for 52 minutes at a cooling rate of 3°C / min to obtain a nitrogen-doped three-dimensional graphene hydrogel (3D NG) . The 3DNG hydrogel was washed with water to a pH of 7.04, and freeze-dried at a freezing rate of 0.02 Pa / (g m2) at −80 °C and a vacuum of 0.2 Pa to obtain a 3D NG aerogel. Place the airgel in the center of a vacuum quartz tube furnace under argon protection, and raise the temperature to 300°C at a heating rate of 5°C / min, and then raise the temperature to 800°C at a heating rate of 10°C / min and keep it for 2 hours After t...

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Abstract

The invention provides a three-dimensional graphene bifunctional oxygen electrode catalyst, which belongs to the technical field of oxygen electrode catalysts and includes three-dimensional graphene, nitrogen and aluminum embedded in the three-dimensional graphene, and cobalt nanoparticles wrapped in the three-dimensional graphene. The electronic structure of three-dimensional graphene is functionally controlled by nitrogen and aluminum. The functionalized graphene has a flower cluster-like morphology and exposes more defects. Cobalt-based nanoparticles are embedded in the three-dimensional structure controlled by nitrogen and aluminum. The oxygen electrode catalyst in the graphene has an encapsulated structure. The cobalt nanoparticles in the inner layer activate the graphene in the outer layer. The graphene in the outer layer protects the cobalt nanocrystals embedded in the inner layer from being etched by alkaline / acidic corrosive solutions. It not only has charming catalytic activity and stability for oxygen reduction reactions under acidic conditions, but also exhibits excellent catalytic performance for oxygen evolution reactions under alkaline conditions.

Description

technical field [0001] The invention relates to the technical field of oxygen electrode catalysts, in particular to a cobalt-heteroatom tailored three-dimensional graphene bifunctional oxygen electrode catalyst and a preparation method thereof. Background technique [0002] With the development of the global economy, the demand for energy and the environment are getting higher and higher, but the utilization efficiency of traditional fossil fuels is low, the pollution to the environment is great, and its storage capacity can no longer meet the needs of human beings for energy. Therefore, it is imminent to develop new renewable energy sources. Energy conversion and storage technology has the potential to replace traditional fossil fuels, and has attracted widespread attention due to its advantages of high efficiency, sustainability, and convenience. [0003] Energy conversion and storage technology is based on the oxygen reduction reaction and oxygen evolution reaction of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24
CPCB01J27/24B01J35/33
Inventor 何兴权马秀秀
Owner CHANGCHUN UNIV OF SCI & TECH
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