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Carbon-carrying shell type copper-platinum catalyst for fuel cell and preparation method thereof

A platinum catalyst, fuel cell technology, used in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. problems, to achieve the effect of enhancing bonding, promoting development, improving catalytic efficiency and utilization of precious metals

Inactive Publication Date: 2011-06-08
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this method is that the operation process is simple and the preparation cost is low, but the particle size of the catalyst is too large, and the catalyst is only connected to the carbon support by adsorption, and it is easy to fall off during the electrochemical reaction, thereby reducing the catalytic efficiency.

Method used

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  • Carbon-carrying shell type copper-platinum catalyst for fuel cell and preparation method thereof
  • Carbon-carrying shell type copper-platinum catalyst for fuel cell and preparation method thereof
  • Carbon-carrying shell type copper-platinum catalyst for fuel cell and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029](1) Weigh 39.32mg CuSO 4 ·5H 2 O and 50 mg of citric acid were dissolved in the ethylene glycol solution, after the complete dissolution, the pH value of the system was adjusted to 10 with the ethylene glycol solution of potassium hydroxide, and XC-72 carbon black treated with 80 mg of concentrated nitric acid was added, and stirred thoroughly. ,well mixed;

[0030] (2) The temperature was raised to 160° C. with stirring, and the temperature was kept constant for 6 hours. During the reaction, the ethylene glycol solution of potassium hydroxide was continuously supplemented to keep the pH value of the system constant. After the reaction was completed, the reacted liquid was centrifuged, the precipitate was washed, and dried to constant weight at 60° C. to obtain carbon-supported Cu particles.

[0031] (3) Weigh 90 mg of the product of step B and fully disperse it in the ethylene glycol solution, add 26.54 mg H 2 PtCl 6 ·6H 2 The pH value of the system was adjusted to...

Embodiment 2

[0034] (1) step A with embodiment 1;

[0035] (2) The temperature was raised to 170° C. with stirring, and the temperature was kept constant for 6 hours. During the reaction, the ethylene glycol solution of potassium hydroxide was continuously supplemented to keep the pH value of the system constant. After the reaction was completed, the reacted liquid was centrifuged, the precipitate was washed, and dried to constant weight at 60° C. to obtain carbon-supported Cu particles.

[0036] (3) step C with embodiment 1;

[0037] (4) Same as step D of Example 1, wherein the Cu loading is 10% and the Pt loading is 10%.

Embodiment 3

[0039] (1) step A with embodiment 1;

[0040] (2) The temperature was raised to 180° C. with stirring, and the temperature was kept constant for 6 hours. During the reaction, the ethylene glycol solution of potassium hydroxide was continuously supplemented to keep the pH value of the system constant. After the reaction was completed, the reacted liquid was centrifuged, the precipitate was washed, and dried to constant weight at 60° C. to obtain carbon-supported Cu particles.

[0041] (3) step C with embodiment 1;

[0042] (4) Same as step D of Example 1, wherein the Cu loading is 10% and the Pt loading is 10%.

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Abstract

The invention provides a carbon-carrying shell type copper-platinum catalyst (Cu@Pt / C) for a fuel cell and a preparation method thereof. In the method, glycol serves as a solvent and a reducing agent to prepare the Cu@Pt / C catalyst with the shell structure. In the method, a two-step reduction method is used to firstly reduce non noble metal and then reduce noble metal; and the temperature and the pH value of the reaction are controlled to cause the noble metal to deposit on the surface of the non noble metal so as to prepare the shell type catalyst. In addition, in the method, a carbon carrier is added in the preparation process, so that a nanometer metal particle directly grows on the carrier to enhance the combination of catalyst particles and the carbon carrier, and the catalyst is more stable so as to greatly improve the catalytic efficiency of the catalyst and the utilization ratio of the noble metal. Cu in the carbon-carrying shell type copper-platinum catalyst accounts for 2-30wt%, and Pt accounts for 5-30wt%.

Description

technical field [0001] The invention belongs to a carbon-loaded core-shell type copper-platinum catalyst (Cu@Pt / C) for a fuel cell and a preparation method thereof. technical background [0002] A fuel cell is an electrochemical device that directly converts chemical energy into electrical energy. One of its key materials is an electrode catalyst. For a long time, noble metals such as platinum and ruthenium have been widely used because of their excellent catalytic performance. However, due to the limited content of platinum group metals in the earth's crust, the price is high, and the rate of platinum in batteries is not high, which limits the development of fuel cells. Although the alloy catalyst can reduce the loading of Pt and improve the catalytic efficiency, the stability of the catalyst needs to be improved. Due to their unique catalytic properties, core-shell catalysts have attracted more and more attention in recent years, and thus have been widely used in various ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90B01J23/89
CPCY02E60/50
Inventor 朱红李兴旺王芳辉于书平娄群
Owner BEIJING UNIV OF CHEM TECH
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