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High-performance low-cost fuel cell anti-reverse anode catalyst and preparation method thereof

A fuel cell and catalyst technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of reducing anti-reversal ability, easy falling off or agglomeration of alloys, high cost, etc., to avoid falling off and agglomeration, and enhance the life of membrane electrodes , Improve the effect of anti-reverse ability

Pending Publication Date: 2022-04-15
GUIZHOU MEILING POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mass ratio of the active component and the carrier in the catalyst is 0.2-0.7:1, the content of noble metal is high, and the cost is high
In addition, the force between the PtIr alloy and the carbon nanotubes is not strong, and the alloy is easy to fall off or agglomerate during the catalytic process, resulting in a decrease in catalytic performance.
[0003] Therefore, the existing technology has shortcomings in solving the problem of anode catalyst cost and anti-reversal, which is manifested in that the anti-reversal catalyst is easy to agglomerate, reduces the anti-reversal ability, affects the power supply capacity and life of the fuel cell, and cannot achieve low-cost Based on the consideration of hydrogen oxidation catalytic performance and anti-reversal performance, it is necessary to further improve the anti-reversal anode catalyst preparation technology to reduce the content of precious metals while maintaining high catalytic activity and anti-reversal ability

Method used

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  • High-performance low-cost fuel cell anti-reverse anode catalyst and preparation method thereof
  • High-performance low-cost fuel cell anti-reverse anode catalyst and preparation method thereof
  • High-performance low-cost fuel cell anti-reverse anode catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A high-performance and low-cost fuel cell anti-counterpolar anode catalyst, the preparation method of which comprises the following steps:

[0029] 1) Add 2 mL of phytic acid, 0.03 g of chloroplatinic acid, 0.01 g of chloroiridic acid, 60 mg of melamine and 250 mg of silica nanospheres into 100 mL of deionized water in sequence, and stir for 1 hour to prepare a mixed solution;

[0030] 2) Put the mixed solution in a drying oven at 80°C and dry it into a solid, then put it into an argon-protected tube furnace, raise the temperature to 880°C at a rate of 5°C / min, and keep it for 2 hours;

[0031] 3) The calcined product was etched with 10 mL of HF solution with a solute volume ratio of 1:10 for 12 hours to remove the silica nanospheres, and then washed by centrifugation and vacuum dried overnight to obtain the anode anti-reverse catalyst Pt 0.7 Ir 0.3 P 2 @NPC;

[0032] At the same time, this embodiment further uses Pt 0.7 Ir 0.3 P 2 Prepared as an anode catalyst la...

experiment example 1

[0048] Membrane electrode performance test:

[0049] The prepared membrane electrode (Example 1, Comparative Example 2) was subjected to an electrochemical performance test: the operating temperature of the battery was 80°C, the gas humidity was 100%, the stoichiometric ratio of cathode and anode was 2 and 1.8 respectively, and the back pressure was 120kPa; figure 2 For the Pt prepared in Example 1 0.7 Ir 0.3 P 2 The polarization curves of @NPC and commercial Pt / C, from figure 2 It can be seen that the prepared anode anti-reverse catalyst is at 1800.12mA / cm 2 It can reach 0.653V, and the catalytic performance is better than that of commercial Pt / C.

[0050] Anti-reverse polarity performance test:

[0051] The prepared membrane electrode (Example 1, Comparative Example 1) was tested for anti-reversal performance: the operating temperature of the battery was 80°C, and the gas flow rate of the anode and cathode was 0.5L / min; image 3 Pt prepared for the present invention ...

Embodiment 2

[0053] A high-performance and low-cost fuel cell anti-counterpolar anode catalyst, the preparation method of which comprises the following steps:

[0054] 1) Add 2 mL of phytic acid, 0.04 g of platinum chloride, 0.01 g of ruthenium chloride, 60 mg of melamine and 250 mg of silica nanospheres into 100 mL of deionized water in sequence, and stir for 1 hour to obtain a uniform mixed solution;

[0055] 2) Put the mixed solution in a drying oven at 80°C and dry it into a solid, then put it into an argon-protected tube furnace, raise the temperature to 900°C at a rate of 5°C / min, and keep it for 2 hours;

[0056] 3) The calcined product was etched with 10 mL of HF solution with a solute volume ratio of 1:10 for 8 hours to remove the silica nanospheres, and then washed by centrifugation and vacuum dried overnight to obtain the anode anti-reverse catalyst Pt 0.8 Ru 0.2 P 2 @NPC;

[0057] At the same time, this embodiment further uses Pt 0.8 Ru 0.2 P 2 Prepared as an anode cataly...

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PUM

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Abstract

The invention belongs to the technical field of catalyst preparation, and particularly relates to a high-performance low-cost fuel cell anti-antipolar anode catalyst and a preparation method thereof.The active component of the anti-antipolar anode catalyst is PtxIr (1-x) P2 or PtxRu (1-x) P2, the carrier is a nitrogen-phosphorus double-doped foamed carbon film, and the anti-antipolar anode catalyst is low in precious metal content and high in stability. The cost can be greatly reduced, an anti-antipolar substance does not need to be additionally added, and the preparation method is simple.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a high-performance and low-cost fuel cell anti-reversed anode catalyst and a preparation method thereof. Background technique [0002] When the fuel cell is started and stopped, the load is changed rapidly, the gas mass transfer channel is blocked by impurities, or the fuel cell is flooded, the hydrogen supply on the anode side is insufficient, which will cause the normal hydrogen oxidation reaction to fail. In order to maintain the charge balance, other substances in the anode catalytic layer undergo oxidation reactions. The first is that the water in the catalytic layer is electrolyzed. After a period of time, the carbon carrier in the catalyst will corrode, and the potential of the anode will gradually be higher than that of the cathode, resulting in reverse polarity, resulting in a decline in the catalytic performance of the catalyst, and even local h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/88
CPCY02E60/50
Inventor 何苗苗冯勇张磊刚李宏健杨代辉陈果白亚峰王波张力涛黎方菊陈晓涛刘富亮
Owner GUIZHOU MEILING POWER SUPPLY CO LTD
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