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Modelling of heterogeneities inside polymer electrolyte fuel cells due to oxidants

DSpace at IIT Bombay

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Title Modelling of heterogeneities inside polymer electrolyte fuel cells due to oxidants
 
Creator GHOSH, PC
DOHLE, H
MERGEL, J
 
Subject current-density distribution
polymer electrolyte fuel cells
current distribution
heterogeneity
air stoichiometry
oxygen concentration
 
Description In present study, the influences of oxidants (concentration and stoichiometry factor) on the heterogeneities inside the polymer electrolyte fuel cells (PEFC) are analysed and modelled. In situ current density mapping technique is adopted to evaluate the heterogeneities. Heterogeneity factor is being introduced in present study to investigate the effects of the oxidants on the local performances. Local and mean performances of the fuel cells are analysed and modelled as a function of the air stoichiometry factor. It is observed that the minimum values of stoichiometry factors required for maintaining heterogeneities inside the fuel cells at the minimum level increase with the mean current density. Based on the experimental results, a model is being developed for determining the optimum values of air stoichiometry factor to maintain the heterogeneity inside the fuel cell at minimum level. The local performances of the fuel cells are investigated as a function of oxygen concentration at the cathode inlet. It is observed that the heterogeneities inside the fuel cell do not always increase with the decrease in the oxygen concentration at the cathode inlets. However, the heterogeneity factor always increases with the decrease in oxygen concentration. (c) 2009 Professor T. Nejat Veziroglu.
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2011-08-25T14:14:46Z
2011-12-26T12:57:06Z
2011-12-27T05:46:54Z
2011-08-25T14:14:46Z
2011-12-26T12:57:06Z
2011-12-27T05:46:54Z
2009
 
Type Article
 
Identifier INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 34(19), 8204-8212
0360-3199
http://dx.doi.org/10.1016/j.ijhydene.2009.07.105
http://dspace.library.iitb.ac.in/xmlui/handle/10054/11044
http://hdl.handle.net/10054/11044
 
Language en