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Catalyst used for cathode reaction of fuel cell and preparation method thereof

A fuel cell cathode and catalyst technology, applied in battery electrodes, nanotechnology for materials and surface science, circuits, etc., can solve problems such as inconvenience, complex catalyst preparation methods, and large gaps in catalytic performance and stability, and achieve Simple and easy preparation method

Active Publication Date: 2019-02-01
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the catalytic performance and stability of these catalysts under acidic conditions are far from those of Pt-based catalysts.
Therefore, there are still great challenges in the development of highly active and stable non-noble metal oxygen reduction catalysts suitable for acidic conditions.
In addition, the preparation methods of non-precious metal-based catalysts reported so far are complicated, more suitable for laboratory research, and not convenient for industrial production.

Method used

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  • Catalyst used for cathode reaction of fuel cell and preparation method thereof
  • Catalyst used for cathode reaction of fuel cell and preparation method thereof
  • Catalyst used for cathode reaction of fuel cell and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1, the preparation of metal organic framework

[0033] 1.071g of zinc nitrate hexahydrate and 2.31g of 2-methylimidazole were mixed in an aqueous solution, and after ten minutes of stirring, the material was completely dissolved, and then nucleated growth and precipitation were carried out for 24 hours, and finally the obtained precipitate was Separation and drying are carried out to obtain a metal-organic framework.

Embodiment 2

[0034] Embodiment two, preparation and performance detection of catalyst 1

[0035] Weigh 800 mg of the metal-organic framework prepared in Example 1, mix it with 200, 400 or 600 mg of cobalt nitrate nonahydrate in an aqueous solution, stir for 1 hour, dry the material, and then place the dried material in a nitrogen atmosphere , heated to 700°C, and kept warm for 0.5-3 hours.

[0036]

[0037] By comparing the catalysts obtained with different cobalt nitrate additions and different pyrolysis times, it can be concluded that the catalysts have good catalytic performance when pyrolyzed at 700°C, and the catalytic performance of the catalyst material with the addition of 400mg of inorganic salts and heat preservation for 1 hour It is the best, and it is numbered 1, and its catalytic performance is shown in Table 1. The electron micrograph of No. 1 catalyst is as follows image 3As shown in (a) to (d), it can be seen that the main composition of the catalyst is that nanoparti...

Embodiment 3

[0038] Embodiment three, preparation and performance detection of catalyst 2

[0039] Weigh 800 mg of the metal-organic framework prepared in Example 1, mix it with 200, 400 or 600 mg of cobalt nitrate nonahydrate in an aqueous solution, stir for 1 hour, dry the material, and then place the dried material in a nitrogen atmosphere , heated to 800°C, and kept warm for 0.5-3 hours.

[0040]

[0041] By comparing the catalysts obtained with different cobalt nitrate additions and different pyrolysis times, it can be concluded that the catalysts have good catalytic performance when pyrolyzed at 800°C, and the catalytic performance of the catalyst material with the addition of 400mg of inorganic salts and heat preservation for 1 hour It is the best, and it is numbered 2, and its catalytic performance is shown in Table 1. The electron micrograph of No. 2 catalyst is as Figure 4 As shown in (a) to (d), it can be seen that the main composition of the catalyst is that nanoparticles...

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Abstract

The invention discloses a catalyst used for cathode reaction of a fuel cell and a preparation method thereof. Firstly, an imidazole compound and zinc nitrate are treated in a solution, in a standing manner, to prepare a porous metal organic framework; then transition metal ions are adsorbed by the metal organic framework; further, high temperature treatment is carried out to reduce the transitionmetal ions into metal nanoparticles having uniform particle size and being coated with a carbon layer, thus preparing the catalyst. The non-noble metal composite catalyst is prepared with the metal organic framework and inorganic salt being precursors, so that on the basis of guaranteeing catalytic activity and stability of the catalyst, the cost of the catalyst is reduced. The method is simple and is suitable for industrial production.

Description

technical field [0001] The invention relates to a catalyst for fuel cell cathode oxygen reduction reaction and a preparation method thereof, in particular to a catalyst composed of transition metal (cobalt, iron) nano particles and a carbon substrate as a composite component. Background technique [0002] Fuel cells are a new type of energy supply equipment with a series of advantages such as high energy density and high environmental friendliness of products. However, fuel cells have not been applied on a large scale in the current industrial production, and one of the main reasons is that the cost of fuel cells is too high. Among them, in the cathode part where the oxygen reduction reaction occurs, the amount of Pt accounts for 80% of the total amount, which greatly increases the cost and becomes a bottleneck problem for its popularization. Compared with Pt-based catalysts, non-precious metal catalysts have better application prospects due to their low cost and abundant r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90B82Y30/00
CPCB82Y30/00H01M4/9041H01M4/9083Y02E60/50
Inventor 侯仰龙黄晓晓
Owner PEKING UNIV
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