Numerical modeling and investigation of gas crossover effects in high temperature proton exchange membrane (PEM) fuel cells

Title
Numerical modeling and investigation of gas crossover effects in high temperature proton exchange membrane (PEM) fuel cells
Authors
주현철
Keywords
High temperature proton exchange membrane fuel cell (HT-PEMFC) Polybenzimidazole (PBI) Numerical modeling Hydrogen crossover Oxygen crossover
Issue Date
2013
Publisher
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Series/Report no.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY; vol.38 startpage 7704 endpage 7714
Abstract
A gas crossover model is developed for a high temperature proton exchange membrane fuel cell (HT-PEMFC) with a phosphoric acid-doped polybenzimidazole membrane. The model considers dissolution of reactants into electrolyte phase in the catalyst layers and subsequent crossover of reactant gases through the membrane. Furthermore, the model accounts for a mixed potential on the cathode side resulting from hydrogen crossover and hydrogen/oxygen catalytic combustion on the anode side due to oxygen crossover, which were overlooked in the HT-PEMFC modeling works in the literature. Numerical simulations are carried out to investigate the effects of gas crossover on HT-PEMFC performance by varying three critical parameters, i.e. operating current density, operating temperature and gas crossover diffusivity to approximate the membrane degradation. The numerical results indicate that the effect of gas crossover on HT-PEMFC performance is insignificant in a fresh membrane. However, as the membrane is degraded and hence gas crossover diffusivities are raised, the model predicts non-uniform reactant and current density distributions as well as lower cell performance. In addition, the thermal analysis demonstrates that the amount of heat generated due to hydrogen/oxygen catalytic combustion is not appreciable compared to total waste heat released during HT-PEMFC operations.
URI
http://dx.doi.org/10.1016/j.ijhydene.2012.07.123
http://dspace.inha.ac.kr/handle/10505/31596
ISSN
0360-3199
Appears in Collections:
College of Engineering(공과대학) > Mechanical Engineering(기계공학) > Journal Papers, Reports(기계공학 논문, 보고서)
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