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Mathematical modeling of mas and charge transport and reaction in a solid oxide fuel cell with mixed ionic conduction

Bertei, A. and Thorel, A.S. and Bessler, W.G. and Nicolella, C. (2012) Mathematical modeling of mas and charge transport and reaction in a solid oxide fuel cell with mixed ionic conduction. Chemical Engineering Science, 68, pp. 606-610. Elsevier. DOI: 10.1016/j.ces.2011.10.025

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Abstract

A mathematical model for the description of transport phenomena and reactions in an innovative solid oxide fuelcell (called IDEAL-Cell) under steady-state conditions is presented. This cell is characterized by an intermediate porous composite layer (called central membrane) between cathodic and anodic compartments, which shows mixed conduction of protons and oxygen ions and offers active sites for their recombination to form water vapor. This paper presents an original model of charge transport and reaction in the central membrane. The model, based on local mass and charge balances, accounts for mixed conduction in the solid phase, diffusion and convection in the gas phase and reaction at the solid/gas interface. The model domain is resolved in a continuum approach by using effective properties related to morphology and material properties through percolation theory. The model predictions are successfully compared with experimental data, which provide an estimate of the kinetic parameter of the water recombination reaction. Simulations show strong dependence of predicted results on the kinetic constant of the water incorporation reaction and the effective conductivities. A design analysis on porosity, thickness, particle dimension, composition of central membrane and cell radius is performed and an optimal membrane design is obtained.

Item URL in elib:https://elib.dlr.de/79818/
Document Type:Article
Title:Mathematical modeling of mas and charge transport and reaction in a solid oxide fuel cell with mixed ionic conduction
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bertei, A.antonio.bertei (at) for.unipi.itUNSPECIFIED
Thorel, A.S.Mines-Paris TechUNSPECIFIED
Bessler, W.G.German Aerospace CenterUNSPECIFIED
Nicolella, C.university PisaUNSPECIFIED
Date:February 2012
Journal or Publication Title:Chemical Engineering Science
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:68
DOI :10.1016/j.ces.2011.10.025
Page Range:pp. 606-610
Publisher:Elsevier
Status:Published
Keywords:solix oxide fuel cell central membrane mixed ionic conduction
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion and Use (old)
HGF - Program Themes:Fuel Cells (old)
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Elektrochemische Prozesse (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Friedrich, Prof.Dr. Kaspar Andreas
Deposited On:18 Dec 2012 14:09
Last Modified:12 Dec 2013 21:55

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