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Alkaline anion exchange membrane fuel cell failure membrane electrode recovery and regeneration method

An alkaline anion, fuel cell technology, applied in fuel cell parts, fuel cell disposal/recycling, fuel cell and other directions, to achieve the effect of simple method, extended running time and easy operation

Active Publication Date: 2014-08-06
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the field of alkaline anion exchange membrane fuel cells, there is no literature / patent mentioning the method of recovering and regenerating failed membrane electrodes.

Method used

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  • Alkaline anion exchange membrane fuel cell failure membrane electrode recovery and regeneration method
  • Alkaline anion exchange membrane fuel cell failure membrane electrode recovery and regeneration method
  • Alkaline anion exchange membrane fuel cell failure membrane electrode recovery and regeneration method

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Experimental program
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Effect test

Embodiment 1

[0021] Constant current 100mA / cm under working temperature of 50°C and 100%RH humidification 2 For the alkaline anion exchange membrane electrode that fails after 383 hours of continuous operation, use 0.5mol / L potassium hydroxide (KOH) alkaline solution for anion exchange treatment for 1 hour to make the anion conduction of the alkaline anion exchange membrane and anion exchange resin The capacity is restored, and then rinsed repeatedly with deionized water for 3 to 5 times and soaked for 90 minutes to remove the residual lye on the surface. Finally, the treated membrane electrode was reassembled into the battery, and then operated under the aforementioned conditions. After the above-mentioned treatment method, the performance of the membrane electrode is restored and regenerated, and it can continue to operate. See figure 1 .

Embodiment 2

[0023] Constant current 100mA / cm under working temperature of 50°C and 100%RH humidification 2 For the alkaline anion exchange membrane electrode that fails after 339 hours of continuous operation, use 1mol / L potassium hydroxide (KOH) alkaline solution for anion exchange treatment for 0.5 hours to improve the anion conductivity of the alkaline anion exchange membrane and anion exchange resin. After being recovered, rinse repeatedly with deionized water for 3 to 5 times and soak for 120 minutes to remove the residual lye on the surface. Finally, reassemble the battery with the treated membrane electrode and operate it under the aforementioned conditions. With the aforementioned treatment method, the performance of the membrane electrode can be recovered and regenerated, and the operation can continue. See figure 2 .

Embodiment 3

[0025] Constant current 100mA / cm under working temperature of 50°C and 100%RH humidification 2 The basic anion exchange membrane electrode that has been continuously operated for 64 hours is used for anion exchange treatment with 1mol / L sodium hydroxide (NaOH) alkaline solution for 0.5 hours, so that the anion conductivity of the alkaline anion exchange membrane and anion exchange resin can be improved. After recovery, rinse repeatedly with deionized water for 3 to 5 times and soak for 120 minutes to remove the residual lye on the surface. Finally, reassemble the battery with the treated membrane electrode and operate it under the aforementioned conditions. Treatment method, the performance of the membrane electrode is restored and regenerated, and can continue to operate. For the recovery of the battery voltage, see image 3 , see the impedance test results before and after treatment Figure 4 .

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Abstract

The present invention relates to an alkaline anion exchange membrane fuel cell failure membrane electrode recovery and regeneration method, which comprises: adopting a strong alkaline solution to treat a failure membrane electrode to convert HCO3<-> produced due to a carbon dioxide effect into OH<-> so as to increase the concentration of free OH<-> in the alkaline anion exchange membrane and the anion exchange resin and recover the OH<-> conductivity, such that the performance of the failure membrane electrode is recovered and regenerated. The method is characterized in that in the case of no damage on the membrane electrode structure, the simple and easy-performing method is adopted to recover and regenerate the performance of the failure membrane electrode so as to prolong the operation time of the battery.

Description

technical field [0001] The invention relates to recovery and regeneration of the failed membrane electrode of an alkaline anion exchange membrane fuel cell, specifically during the operation of an alkaline anion exchange membrane fuel cell, due to fuel, oxidant carried and catalyst carbon carrier oxidized during battery operation The influence of carbon dioxide and the method of recovering and regenerating the invalid membrane electrode caused by the sharp drop in the free OH- concentration inside the anion exchange membrane and anion exchange resin. Background technique [0002] Alkaline anion exchange membrane fuel cell (APEFC) is a power generation device that directly converts chemical energy in fuel and oxidant into electrical energy through an electrochemical reaction. It is based on having OH - Conductive alkaline anion exchange membrane is used as the electrolyte. The two sides of the membrane are composed of cathode and anode catalyst layers and cathode and anode g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/00H01M8/02H01M4/86
CPCY02E60/50H01M8/008H01M8/083Y02W30/84
Inventor 俞红梅刘艳喜赵云邵志刚衣宝廉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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