Modeling the hydrogen kinetics for the porous anode in a PEFC
2004 (English)Conference paper (Refereed)
An agglomerate model for the porous anode was developed to study the influence of the porous structure. In the model migration of protons through the electrode and diffusion of hydrogen in spherical agglomerates and in a possible polymer film surrounding the agglomerates was included. Tafel-Volmer kinetics and a Langmuir isotherm was assumed. Both a steady-state and an electrochemical impedance spectroscopy, EIS, model was developed. Simulations with the steady-state model, using reasonable input parameters, showed that the anode is under mixed control of kinetics, hydrogen diffusion and proton migration. The EIS model gave a Nyquist plot with two semi-circles, a high frequency loop due to the double layer capacitance and a low frequency loop due to adsorption of hydrogen. The modelling results show that a realistic model for the anode must include migration and diffusion limitations.
Place, publisher, year, edition, pages
2004. 224-232 p.
, Proceedings - Electrochemical Society, PV 2003-24
Agglomeration, Capacitance, Diffusion, Hydrogen, Langmuir Blodgett films, Porous materials, Impedance spectroscopy, Input parameters, Tafel-Volmer kinetics, Anodes
IdentifiersURN: urn:nbn:se:kth:diva-157265ScopusID: 2-s2.0-33645296031OAI: oai:DiVA.org:kth-157265DiVA: diva2:771298
204th Electrochemical Society Fall Meeting, 12 October 2003 through 16 October 2003, Orlando, FL, United States
QC 201412122014-12-122014-12-082014-12-12Bibliographically approved