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CSME 2023/08
Volume 44 No.4
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331-340
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Effectiveness of Air-Bleeding on the CO Tolerance Improvement of High Temperature Proton Exchange Membrane Fuel Cells
Chen-Yu Chena and Jia-Xuan Zhanga
aDepartment of Mechanical and Energy Engineering, National Chiayi University, Chiayi, Taiwan 60004, ROC.
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Abstract:
Fuel cell technologies are eco-friendly, and thus they are developed to reach the global goal of net-zero carbon emissions. To increase the fuel cell CO tolerance and simplify purification processes of reformate fuel cell systems, the reformate high-temperature proton exchange membrane fuel cell (HTPEMFC) becomes one of the promising solutions.
In this research, the effectiveness of air-bleeding on the CO tolerance improvement of HTPEMFCs is studied. The voltage signal-to-noise ratio (SNR) and electrochemical impedance spectroscopy analysis indicate that air-bleeding suppresses the CO poisoning reaction, reduces the poisoning intensity, and improves the stability of the HTPEMFC performance. The air-bleeding concentration for the HTPEMFC between 140-180 ℃ with CO of less than 5% is suggested to be 1-1.5%, because excess air does not enhance its effectiveness. The SNR analysis as well indicates that the working temperature and H2 concentration affect the CO poisoning intensity more significantly than the air-bleeding concentration.
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Keywords: high temperature proton exchange membrane fuel cell, CO poisoning, air-bleeding, fuel cell performance, signal-to-noise ratio
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©
2023
CSME , ISSN 0257-9731
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