DEVELOPMENT OF LSF-BASED DUAL-PHASE CATHODES FOR INTERMEDIATE TEMPERATURE SOLID OXIDE FUEL CELLS

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Thesis-Ramin Babazadeh Dizaj.pdf

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2022-12-09

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Babazadeh Dizaj, Ramin

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In this thesis, a study was carried out on LSM-LSF composite cathodes for IT-solid oxide fuel cells. The study follows the previous work carried out on LSC113-LSC214 dual-phase and LSM/LSF/ScSZ composite cathodes, both developed for IT-SOFCs. The study involved the synthesis of active material, namely (La0.5Sr0.5)MnO3-δ (LSM), (La0.8Sr0.2)FeO3-δ (LSF), and Sc0.15Zr0.85O2-δ (ScSZ) via Pechini method. Symmetric cells were fabricated, and cathodes were characterized electrochemically via EIS measurements. For this purpose, ScSZ electrolyte discs were produced via a tape-casting method. The discs were used as the substrates on which cathodes of the same composition were deposited via sputter deposition on both sides of the electrolyte using sputter targets produced from the synthesized powders. LSM/LSF composite cathodes with different compositions were obtained via combinatorial sputter deposition yielding composite cathodes with composition ranging from LSM: LSF=7:93 to LSM: LSF=62:38. The symmetric cells with these cathodes were electrochemically characterized for temperatures ranging from 600 to 800°C with 50°C intervals. The study has shown that the area-specific resistance values were, in general, less than ASR=0.3 ohm.cm2 at 800°C for all compositions The lowest temperature for which the benchmark value of ASR= 0.15 ohm.cm2 was obtained was 780°C. This was obtained for LSM42LSF58 where the constituent oxides had nearly equal proportions.

Subject Keywords

SOFC, Cathode, LSM, LSF, Magnetron Sputtering

URI

https://hdl.handle.net/11511/101342

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

R. Babazadeh Dizaj, “DEVELOPMENT OF LSF-BASED DUAL-PHASE CATHODES FOR INTERMEDIATE TEMPERATURE SOLID OXIDE FUEL CELLS,” M.S. - Master of Science, Middle East Technical University, 2022.