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Electrochemical impedance modeling of the proton conducting membrane in a PEFC
KTH, Superseded Departments, Chemical Engineering and Technology.
KTH, Superseded Departments, Chemical Engineering and Technology.ORCID iD: 0000-0001-9203-9313
2004 (English)Conference paper (Refereed)
Abstract [en]

An electrochemical impedance spectroscopy (EIS) model for water transport in the membrane in a polymer electrolyte fuel cell has been developed. Simulations show that an electrolyte can give a semi-circle in EIS if the resistivity or water concentration changes with current density. The magnitude of the loop is the sum of i-dR/di and dEconc/di, where E conc is the potential difference associated with the difference in water concentration between the anode and cathode side. The loop is capacitive for a positive sum and inductive for a negative sum. The characteristic frequency is proportional to the effective diffusivity of water and inversely proportional to the square of the membrane thickness. The model is based on the concentrated electrolyte theory, but similar results have also been obtained with a model for a diluted electrolyte. The influence of Econc is, however, omitted.

Place, publisher, year, edition, pages
2004. 13-22 p.
, Proceedings - Electrochemical Society, PV 2004-21
Keyword [en]
Cathodes, Computer simulation, Electrochemistry, Mathematical models, Electrochemical impedance modeling, Proton conducting membrane, Water concentration, Fuel cells
National Category
Chemical Engineering
URN: urn:nbn:se:kth:diva-157268ScopusID: 2-s2.0-33751299985ISBN: 1566774349ISBN: 9781566774345OAI: diva2:771285
206th Meeting of The Electrochemical Society Fall 2004, 3 October 2006 through 8 October 2006, Honolulu, HI, United States

QC 20141212

Available from: 2014-12-12 Created: 2014-12-08 Last updated: 2014-12-12Bibliographically approved

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