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Computational modeling of proton exchange membrane fuel cells including gas-crossover behavior

Title
Computational modeling of proton exchange membrane fuel cells including gas-crossover behavior
Author
이성철
Keywords
PEMFC; anode flooding; gas crossover; mixed potential; computational fluid dynamics
Issue Date
2013-04
Publisher
John Wiley & Sons, Ltd
Citation
International Journal of Energy Research, Vol.37, No.15 [2013], p1981-1991
Abstract
In a typical proton exchange membrane fuel cell (PEMFC), Nafion, i.e. a typical proton-exchange membrane, allows to permeate hydrogen and oxygen to the opposite electrode, resulting in unexpected parasitic reaction, and reduces open circuit potential (OCP) because of undesirable potential mixing. This paper investigates the influences of the anode flooding and fuel starvation on cell performance under mixed-potential conditions. A two-dimensional computational fluid dynamics model was formulated by considering direct oxidation reaction when hydrogen and oxygen molecules meet to account additional water generation in both anode and cathode catalyst layers. The present model was validated by comparing the simulated cell polarization with experimentally measured cell polarization. The authors have prepared membrane electrode assembly by the decal transfer method to precisely determine various parameters that dominate the electrode kinetics. Model validation was also conducted to clearly present the predictability of the model with different cell configurations, i.e. with and without microporous layers. Through the model, effect of the oxygen permeation coefficient of the Nafion membrane on the anode flooding was investigated. In addition, reverse-current generation was predicted with different anode saturations and oxygen permeation coefficients to provide a detailed explanation on their relationship.
URI
http://onlinelibrary.wiley.com/doi/10.1002/er.3055/abstract?http://hdl.handle.net/20.500.11754/44261
ISSN
0363-907X
DOI
10.1002/er.3055
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > CHEMICAL ENGINEERING(화학공학과) > Articles
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