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This dissertation introduces a comprehensive model for a single solid oxide fuel cell (SOFC) as well as a procedure to optimize its configuration and operating condition, so that the net power is maximized. The model consists of coupled thermodynamic and electrochemical submodels to determine the SOFC performance under various configurations and operation conditions. The thermodynamic model is derived from physical laws (e.g., the first law of thermodynamics, Fick's law, Fourier's law) to obtain the temperature and reactants concentration distribution in the SOFC. The electrochemical model is integrated with a submodel for the microstructure of SOFC composite electrodes and allows the computation of the SOFC voltage, current, and power output. The electrochemical model is validated with experimental data and showed improved accuracy compared to previously published models. Based on the simulation results, the composite electrodes microstructure (porosities, active three phase boundaries), PEN (positive electrode-electrolyte-negative electrode assembly) internal structure and SOFC external structure, as well as the operating conditions such as fuel utilization factor and air stoichiometric ratio are investigated and their impact on the SOFC performance is discussed. Subjected to a fixed total volume, the optimal internal and external configuration and operating parameters are pursued so that the net power of the SOFC is maximized. The method used is general and the results are sharp, which shows the potential to use the model as a tool for future SOFC design, simulation and optimization.
A Dissertation submitted to the Department of Mechanical Engineering in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
Bibliography Note
Includes bibliographical references.
Advisory Committee
Juan C. Ordóñez, Professor Directing Dissertation; Jim P. Zheng, University Representative; Helen Li, Committee Member; Chiang Shih, Committee Member; Patrick Hollis, Committee Member.
Publisher
Florida State University
Identifier
FSU_migr_etd-5270
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