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Oxygen reduction catalyst, preparation method and application thereof

A catalyst and nitrogen-doped carbon technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as easy agglomeration, difficult repetition, low surface area, etc., to promote catalytic reactions, Raw materials are readily available and the preparation method is simple

Active Publication Date: 2018-01-16
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, the preparation method of transition metals and nitrogen-doped carbon materials is generally to directly calcine transition metal salts, nitrogen-containing organic substances and carbon precursors at high temperature. shortcoming

Method used

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  • Oxygen reduction catalyst, preparation method and application thereof
  • Oxygen reduction catalyst, preparation method and application thereof
  • Oxygen reduction catalyst, preparation method and application thereof

Examples

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Embodiment 1

[0038] This embodiment discloses an oxygen reduction catalyst, which includes a hollow nitrogen-doped carbon sphere with a shell, and transition metal nanoparticles embedded in the shell; the shell also has mesopores penetrating inside and outside Pore ​​channel, the average pore diameter of the mesoporous channel is 3.8nm.

[0039] Specifically, in this embodiment, the transition metal nanoparticles are cobalt nanoparticles, and the average particle size of the cobalt nanoparticles is 20 nm.

[0040] More specifically, the particle size of the hollow nitrogen-doped carbon sphere is 290nm, and the thickness of the shell is 20nm; the specific surface area of ​​the oxygen reduction catalyst is 340m 2 / g.

[0041] It is worth noting that the material of the shell in the oxygen reduction catalyst of this embodiment is nitrogen-doped carbon, which has a graphene-like structure; that is, when the shell is in an unfolded state, it is a two-dimensional layered structure, and the she...

Embodiment 2

[0044] Example 2 is intended to describe in detail the preparation method of the oxygen reduction catalyst in Example 1 above.

[0045] The preparation method of the oxygen reduction catalyst according to the present embodiment comprises the following steps:

[0046] In step S1, the microsphere template is dispersed in the alkaline solution to obtain a first mixture.

[0047] In this embodiment, the microsphere template is specifically a polystyrene microsphere template, and the alkaline solution is trishydroxymethylaminomethane aqueous solvent; but the present invention is not limited thereto, and the microsphere template is also Can be other templates such as polyacrylate microspheres, polyurethane microspheres, etc., as long as the materials can be thermally decomposed at a higher temperature (such as 700 ° C ~ 1000 ° C); the alkaline solution can also be such as At least one of aqueous ammonia solution, aqueous sodium hydroxide solution, aqueous potassium hydroxide soluti...

Embodiment 3

[0059] Example 3 is intended to describe the application of the oxygen reduction catalyst described in Example 1 in the cathode of a fuel cell.

[0060] The application of the oxygen reduction catalyst according to this embodiment in the cathode of the fuel cell specifically refers to the following steps:

[0061] In step Q1, the oxygen reduction catalyst is dispersed in an aqueous solution of ethanol to obtain a first solution.

[0062] Specifically, the mass of the oxygen reduction catalyst in Example 1 used in this example is 5 mg, and the aqueous ethanol solution used to disperse the oxygen reduction catalyst is prepared by mixing 765 μL of water and 200 μL of ethanol.

[0063] In step Q2, a perfluorosulfonic acid solution is added to the first solution to obtain a first slurry.

[0064] Specifically, the amount of perfluorosulfonic acid solution used was 35 μL.

[0065] Preferably, after adding the perfluorosulfonic acid solution to the first solution, sonicate for 40 m...

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Abstract

The invention discloses an oxygen reduction catalyst. The oxygen reduction catalyst includes: a hollow nitrogen doped carbon sphere with a shell, and transition metal nanoparticles embedded in the shell. The oxygen reduction catalyst provided by the invention has uniform transition metal nanoparticle-nitrogen doped active centre, appropriate mesoporous channel aperture and high specific surface area, is conducive to transfer of reactants and products in the oxygen reduction process, thus having efficient oxygen reduction catalytic performance and excellent stability. The invention also discloses a preparation method of the oxygen reduction catalyst. The method includes: dispersing a microsphere template dispersed in an alkaline solution to obtain a first mixture; adding a nitrogen doped carbon source and a transition metal salt into the first mixture, and polymerizing the nitrogen doped carbon source to obtain a second mixture; and drying the second mixture, and performing calcinationsin a protective gas, thus obtaining the oxygen reduction catalyst. The invention also discloses application of the oxygen reduction catalyst in cathodes of fuel cells.

Description

technical field [0001] The invention belongs to the technical field of oxygen reduction catalysts, and in particular relates to an oxygen reduction catalyst and its preparation method and application. Background technique [0002] Fuel cell is a kind of power generation equipment that directly converts the chemical energy of fuel into electric energy efficiently and without pollution. It is the fourth generation power generation technology following hydraulic power, thermal power and nuclear power. [0003] The oxygen reduction reaction rate of the cathode of the fuel cell is relatively slow. In practical applications, catalysts with high catalytic activity must be used to increase the oxygen reduction rate. Generally, platinum nanoparticles supported on carbon materials are used as catalysts. However, the above-mentioned catalysts belong to noble metal platinum-based catalysts, which have problems such as high price, scarce reserves in nature, and poor stability in alkalin...

Claims

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Application Information

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IPC IPC(8): B01J27/24H01M4/90
CPCY02E60/50
Inventor 王强斌胡峰汪昌红杨红超张叶俊
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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