Numerical modeling of solid oxide fuel cells

This paper presents a numerical model for a planar solid oxide fuel cell (SOFC) with mixed ionic-electronic conducting electrodes. Transport of positive or negative charges, which takes place in the direction of down- or up-gradient electric potential, respectively, within the composite electrodes and through the electrolyte membrane, is mimicked by making use of an algorithm for Fickian diffusion in the commercial software. The output cell voltage, which is the potential difference between the two current collectors, is fixed at a given value. The coupled equations describing the conservation of mass, momentum and energy and the chemical and electrochemical processes are solved using the commercial package Star-CD, augmented with subroutines developed in-house. Results for the concentration of chemical species and the distributions of temperature and current density in an anode-supported SOFC with direct internal reforming are presented and discussed. The potential for using this model as a general numerical tool to study the impact of the detailed processes taking place in solid oxide fuel cells is discussed.

[1]  David G. Goodwin,et al.  Numerical Study of Heterogeneous Reactions in an SOFC Anode With Oxygen Addition , 2007, ECS Transactions.

[2]  Raymond J. Gorte,et al.  Novel SOFC anodes for the direct electrochemical oxidation of hydrocarbon , 2002 .

[3]  M. Fowler,et al.  Performance comparison of Fick’s, dusty-gas and Stefan–Maxwell models to predict the concentration overpotential of a SOFC anode , 2003 .

[4]  David G. Goodwin,et al.  Non Linear Modeling of Mixed Ionic Electronic Conductors , 2007 .

[5]  Y. Inui,et al.  Analytical investigation on cell temperature control method of planar solid oxide fuel cell , 2006 .

[6]  Tohru Kato,et al.  Numerical analysis of output characteristics of tubular SOFC with internal reformer , 2001 .

[7]  R. Kee,et al.  Modeling Distributed Charge-Transfer Processes in Membrane Electrode Assemblies with Mixed-Conducting Composite Electrodes , 2007 .

[8]  R. Kee,et al.  A general mathematical model for analyzing the performance of fuel-cell membrane-electrode assemblies , 2003 .

[9]  I. Yasuda,et al.  3-D model calculation for planar SOFC , 2001 .

[10]  Gregor Hoogers,et al.  Fuel Cell Technology Handbook , 2002 .

[11]  Vinod M. Janardhanan,et al.  Non-commercial Research and Educational Use including without Limitation Use in Instruction at Your Institution, Sending It to Specific Colleagues That You Know, and Providing a Copy to Your Institution's Administrator. All Other Uses, Reproduction and Distribution, including without Limitation Comm , 2022 .

[12]  S. Cocchi,et al.  A global thermo-electrochemical model for SOFC systems design and engineering , 2003 .

[13]  Eric Croiset,et al.  Mechanistic modelling of a cathode-supported tubular solid oxide fuel cell , 2006 .

[14]  Chao-Yang Wang,et al.  Fundamental Models for Fuel Cell Engineering , 2004 .

[15]  Ben Kenney,et al.  Mathematical Micro-Model of a Solid Oxide Fuel Cell Composite Cathode , 2004 .

[16]  S. Chan,et al.  A complete polarization model of a solid oxide fuel cell and its sensitivity to the change of cell component thickness , 2001 .

[17]  M. Khaleel,et al.  Three-dimensional thermo-fluid electrochemical modeling of planar SOFC stacks , 2003 .

[18]  Vinod M. Janardhanan,et al.  Numerical study of mass and heat transport in solid-oxide fuel cells running on humidified methane , 2007 .

[19]  C. Adjiman,et al.  Anode-supported intermediate temperature direct internal reforming solid oxide fuel cell. I: model-based steady-state performance , 2004 .

[20]  Jürgen Fleig,et al.  Solid Oxide Fuel Cell Cathodes: Polarization Mechanisms and Modeling of the Electrochemical Performance , 2003 .

[21]  Yann Bultel,et al.  Modeling of a SOFC fuelled by methane: From direct internal reforming to gradual internal reforming , 2007 .

[22]  Vinod M. Janardhanan,et al.  Modeling Elementary Heterogeneous Chemistry and Electrochemistry in Solid-Oxide Fuel Cells , 2005 .

[23]  Yixiang Shi,et al.  Modeling of an anode-supported Ni–YSZ|Ni–ScSZ|ScSZ|LSM–ScSZ multiple layers SOFC cell: Part I. Experiments, model development and validation , 2007 .

[24]  Jürgen Fleig,et al.  On the width of the electrochemically active region in mixed conducting solid oxide fuel cell cathodes , 2002 .

[25]  Vladimir S. Bagotsky,et al.  Fundamentals of Electrochemistry , 2005 .

[26]  Lionel M. Raff,et al.  Principles of Physical Chemistry , 2001 .

[27]  W. Bessler,et al.  A new framework for physically based modeling of solid oxide fuel cells , 2007 .

[28]  Werner Lehnert,et al.  Modelling of gas transport phenomena in SOFC anodes , 2000 .

[29]  Chao-Yang Wang,et al.  Computational Fluid Dynamics Modeling of Solid Oxide Fuel Cells , 2003 .

[30]  M. Chyu,et al.  Simulation of the chemical/electrochemical reactions and heat/mass transfer for a tubular SOFC in a stack , 2003 .