Kinetic Equilibrium Study of CO2 Poisoning Observed in Anion Exchange Membranes When Exposed to Ambient Air and Varying Levels of CO2 ppm
One of the hurdles in Anion exchange membrane fuel cell technology is weaker understanding of CO2 poisoning observed when they are exposed to air. Our previous work suggests that OH- ions depletes in approximately 15 min to form CO32- and HCO3- ions when exposed to ambient air at 30 degrees C and 95%RH (1). However, an actual fuel cell device is operated at a much higher temperature. In this study we have reported the CO2 absorption data at different temperatures and different CO2 concentration environment. Our data suggest that the air equilibrated AEM concentration of CO32- increases at higher temperatures whereas HCO3- concentration follows a decreasing trend. The OH- ion has a very insignificant change at higher temperatures but we observe that the equilibrium OH- concentration is higher at lower ppm level of CO2 environment. This indicates that the CO2 reaction is dependent on CO2 concentration in air.
- Research Organization:
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- DOE Contract Number:
- AC36-08GO28308
- OSTI ID:
- 1489185
- Report Number(s):
- NREL/JA-5900-73006
- Journal Information:
- ECS Transactions (Online), Vol. 86, Issue 13; ISSN 1938-6737
- Publisher:
- Electrochemical Society
- Country of Publication:
- United States
- Language:
- English
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