Method for relieving anode poisoning of proton exchange membrane fuel cell by utilizing transient temperature rise

A proton exchange membrane and fuel cell technology, applied in fuel cells, circuits, electrical components, etc., can solve problems such as poor operability, complicated operation, and no anode catalyst found, and achieve improved operation stability with a simple and easy method Effect

Pending Publication Date: 2022-02-08
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the use of pure hydrogen can partially restore the performance of the fuel cell, and the degree of recovery depends on the poisoning time and fuel metering ratio; the performance of the battery can also be significantly restored by injecting ozone into the anode, which can be restored to more than 95% of the initial value, but the injection of high concentration The ozone will cause the membrane electrode assembly to degrade and cause irreversible decay of the fuel cell
The electro-oxidation method can restore battery performance to the greatest extent or even completely. However, this method needs to pass hydrogen gas into the cathode of the battery as a reference electrode, which is complicated to operate, has certain safety hazards, and has poor operability; the development of H 2 S-poisoned anode catalysts are an effective way to alleviate PEMFC poisoning, but no anti-H 2 Anode catalysts with significant S effect, the reported Pd 85 Cu 15 / C alloy catalyst only mitigates the H 2 S poisoning

Method used

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  • Method for relieving anode poisoning of proton exchange membrane fuel cell by utilizing transient temperature rise
  • Method for relieving anode poisoning of proton exchange membrane fuel cell by utilizing transient temperature rise

Examples

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Effect test

Embodiment 1

[0027] After the fuel cell is poisoned by the anode catalyst, the anode side is fed with a gas flow of 200 sccm high-purity hydrogen, and the cathode side is fed with a gas flow of 800 sccm air, and the fuel cell is at the open circuit potential. Increase the operating temperature of the fuel cell at a rate of 1 degree Celsius per minute, set the temperature to 82.5 degrees Celsius, and run the fuel cell at this temperature for 1 hour, and the battery is 500mA cm -2 Constant current operation. After the operation is completed, reduce the operating temperature of the fuel cell and set the temperature to the normal operating temperature of the fuel cell. During the cooling process, the fuel cell is at the open circuit potential, and then perform an activation test on the fuel cell. The mitigation methods are as follows: figure 1 shown. vs. 1000 mA cm -2 The battery performance under the current density, it can be seen that the method of introducing high-purity hydrogen at the ...

Embodiment 2

[0029] Using the same test method as in Example 1, the operating temperature of the fuel cell was changed, and the temperature was set to 90 degrees Celsius. The study found that, consistent with the results of Example 1, compared with the performance recovery ratio of the pure hydrogen battery, the battery performance recovery under the 90°C operation mitigation strategy also increased significantly, reaching 86.6%. Due to the increase in temperature, the desorption of impurities It is easier and the recovery rate is also significantly increased.

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Abstract

The invention relates to a method for relieving anode poisoning of a proton exchange membrane fuel cell by using transient temperature rise. In allusion to a fuel cell poisoned by impurities in hydrogen, a method of introducing pure hydrogen and transiently increasing the operating temperature of the cell is adopted, so that the impurities such as hydrogen sulfide and carbon monoxide adsorbed on an anode catalyst are quickly desorbed, and then anode poisoning of the fuel cell is relieved. The method is simple and high in operability, and the operation stability of the fuel cell can be effectively improved.

Description

technical field [0001] The invention belongs to the field of proton exchange membrane fuel cells, and in particular relates to a method for alleviating anode poisoning of proton exchange membrane fuel cells by using short-term temperature rise. Background technique [0002] Proton exchange membrane fuel cells (PEMFCs) are considered to be the most promising energy conversion devices in the fields of transportation and stationary power plants due to their clean, efficient, low operating temperature, and noiseless operation. At present, my country's vehicle fuel cell hydrogen mainly comes from industrial by-product hydrogen, which contains CO, CO 2 、H 2 S, Cl - and other impurities. Although these impurities can be removed by high-cost purification methods, some trace impurities will inevitably be caused during the storage-transport-transportation process of hydrogen, which is difficult to meet the hydrogen standards for automotive fuel cells and seriously affects the perfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0662H01M8/0668
CPCH01M8/0668H01M8/0675Y02E60/50
Inventor 窦美玲柯绍杰崔博览孙潮涌段雅鑫
Owner BEIJING UNIV OF CHEM TECH
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