A kind of preparation method of platinum-based alloy catalyst

A technology of platinum-based alloys and catalysts, which is applied in the field of preparation of platinum-based alloy catalysts, can solve the problems of high price of precious metal platinum catalysts, achieve the effects of improving stability and durability, improving particle surface structure, and avoiding loss

Active Publication Date: 2019-07-05
QINGDAO CHUANGQI XINNENG CATALYSIS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, precious metal platinum catalysts are expensive. If the amount of platinum used in the cathode catalyst can be reduced to reduce the production cost, it will be the key to realize the large-scale commercial application of PEMFC.

Method used

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  • A kind of preparation method of platinum-based alloy catalyst
  • A kind of preparation method of platinum-based alloy catalyst
  • A kind of preparation method of platinum-based alloy catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The present embodiment provides the preparation method of platinum-nickel alloy catalyst, and it comprises the following steps:

[0037] (1) Prepare platinum and nickel alloy particles with an average size of about 4.4nm, and control the atomic number ratio of platinum and nickel in the prepared alloy particles to be about 1: 3, such as figure 1 and 2 shown;

[0038] (2) at 70 degrees centigrade, adopt 0.5mol / L nitric acid aqueous solution to carry out acid treatment to the alloy particles prepared in step (1) for 6 hours;

[0039] (3) The alloy particles treated in step (2) are annealed in air at 180 degrees Celsius. The annealing time is 14 hours, and the platinum-nickel alloy catalyst is made, and the platinum-nickel alloy catalyst is measured. The average size of nickel alloy catalyst particles is about 4.1nm, and the atomic number ratio of platinum to nickel is about 3:1, such as image 3 and 4 shown.

[0040] Performance Testing

[0041] Sampling was carried...

Embodiment 2

[0045] The present embodiment provides the preparation method of platinum-cobalt alloy catalyst, and it comprises the following steps:

[0046] (1) Prepare platinum and cobalt alloy particles with an average size of about 2.5nm, and control the atomic number ratio of platinum and cobalt in the prepared alloy particles to be about 1: 3, such as Figure 5 shown;

[0047] (2) At 80 degrees centigrade, the alloy particles prepared in step (1) were acid-treated for 6 hours using a 0.5mol / L sulfuric acid aqueous solution;

[0048] (3) The alloy particles treated in step (2) are annealed in the air at 180 degrees Celsius for 14 hours to make the platinum-cobalt alloy catalyst, and the platinum-cobalt alloy catalyst is measured. The average size of cobalt alloy catalyst particles is about 2.3nm, and the atomic number ratio of platinum to cobalt is about 3:1, such as Figure 6 shown.

[0049] Performance Testing

[0050] Sampling was carried out, and the various performances of the c...

Embodiment 3

[0054] The present embodiment provides the preparation method of platinum iron alloy catalyst, and it comprises the following steps:

[0055] (1) Prepare platinum and iron alloy particles with an average size of about 3.1nm, and control the atomic number ratio of platinum and iron in the prepared alloy particles to about 1:3;

[0056] (2) At 60 degrees Celsius, the alloy particles prepared in step (1) were acid-treated for 4 hours by using 0.5mol / L acetic acid aqueous solution;

[0057] (3) The alloy particles treated in step (2) are annealed in air at 200 degrees Celsius for 12 hours, and the platinum-iron alloy catalyst is made, and the platinum-iron alloy catalyst obtained is measured. The average size of the catalyst particles is about 2.8 nm, and the atomic number ratio of platinum to iron is about 3:1.

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Abstract

The invention discloses a preparation method of a platinum-based alloy catalyst, which comprises the following steps: (1) preparing nano-sized alloy particles of platinum and 3d transition metals; (2) acid-treating the alloy particles prepared in step (1) (3) annealing the alloy particles treated in step (2); the platinum-based alloy catalyst prepared by the present invention can prevent the loss of transition metals in the working environment, and realize the long-term use process of the platinum-based alloy catalyst The electrochemical active area, oxygen reduction specific activity, oxygen reduction mass activity and other properties basically remain unchanged, which ensures the long-term durable use of platinum-based alloy catalysts and is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of catalysts, in particular to a catalyst for a proton exchange membrane fuel cell, in particular to a preparation method of a platinum-based alloy catalyst. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is the core of hydrogen energy economy. PEMFC converts chemical energy into electrical energy through hydrogen cold combustion, and water is the only emission. Due to the high overpotential of PEMFC cathode oxygen reduction reaction, noble metal platinum catalyst can Effectively reduce the overpotential, so as to realize the efficient utilization of hydrogen energy. However, noble metal platinum catalysts are expensive. If the amount of platinum used in the cathode catalyst can be reduced to reduce the production cost, it will be the key to realize the large-scale commercial application of PEMFC. At present, the alloying of platinum and 3d transition metals has been proved to be an effectiv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/92
CPCH01M4/921C22C5/04C22F1/14C23F1/30H01M4/8652H01M4/881H01M4/8842H01M4/886H01M4/926H01M8/1004H01M2008/1095H01M8/1007Y02E60/50Y02P70/50
Inventor 杨翼王中奇郭存心
Owner QINGDAO CHUANGQI XINNENG CATALYSIS TECH CO LTD
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