Modeling diffusion limitation in solid-oxide fuel cells

• Published in: Electrochimica acta Vol. 56; no. 27; pp. 9775 - 9782
• Main Authors: Janardhanan, Vinod M., Deutschmann, Olaf
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 30.11.2011; Elsevier
• Subjects: Applied sciences; Bonding; Concentration losses; Constraining; Diffusion; Diffusion limitation; Electric potential; Energy; Energy. Thermal use of fuels; Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc; Exact sciences and technology; Fluxes; Fuel cells; Mathematical modeling; Solid-oxide fuel cells; Surface diffusion; Tortuosity; Voltage; Solid-oxide fuel cells; Mathematical modeling; Diffusion limitation; Surface diffusion; Tortuosity; Concentration losses; Theoretical study; Mathematical model; Modeling; Solid oxide fuel cell
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2011.08.038

► Surface diffusion coefficients from chemisorption energies.► Chemisorption energy from bond-order conservation Morse potential method. ►Surface diffusion does not lead to diffusion limitations .►Diffusion limitation originates from interface diffusion Effect of surface diffusion on the performance of solid-oxide fuel cell is investigated. A methodical approach for the evaluation of surface diffusion coefficients of various adsorbed species based on bond-order conservation Morse potential (BOC-MP) method is presented. The surface diffusion fluxes are used for the evaluation of temporal changes in surface coverages. Our analysis shows that surface diffusion does not lead to the concentration losses in solid oxide fuel cells. Further analysis is carried out and results are presented to substantiate the significance of interface diffusion on the behavior of voltage at limiting current.