One pot synthesis of (La,Sr)CoO3/(La,Sr)2CoO4 for IT-SOFCs cathodes

Date

2018-10-04

Author

Torunoglu, Ziya Çağrı
Sarı, Doğancan
Demircan, Oktay
Kalay, Yunus Eren
Öztürk, Tayfur
Kuru, Yener

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It is well known that hetero-interfaces in (La,Sr)CoO3/(La,Sr)(2)CoO4 (LSC113/214) are beneficial in catalyzing ORR for SOFC cathodes. This can be achieved by synthesizing the individual phases and mixing them together. In this study, so as to maximize the hetero interfaces, an alternative method was used in which one pot Pechini method was employed to synthesize a two-phase structure. LSC113/214 two phase structures from one precursors solution were successfully synthesized without the formation of any undesired third phase for the first time. It was found that a minimum temperature of 800 degrees C was necessary so as to obtain the fully crystallized dual phase powder. Two phase structures of molar fractions from 0.40 to 0.60 was targeted and were successfully obtained with some deviations. Impedance measurements were carried out on porous conventional symmetric cells fabricated with the synthesized dual phase powders between 400 and 700 degrees C. The dual phase powders had improved electrode performance as compared to single phase and physically mixed powders, but this was limited down to 500 degrees C. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Subject Keywords

IT-Solid oxide fuel cell, Dual oxide cathode, (La,Sr)CoO3/(La,Sr)(2)CoO4, Cathode performance, Electrochemical impedance, Spectroscopy

URI

https://hdl.handle.net/11511/30033

Journal

International Journal of Hydrogen Energy

DOI

https://doi.org/10.1016/j.ijhydene.2018.04.238

Collections

Graduate School of Natural and Applied Sciences, Article

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Citation Formats

Z. Ç. Torunoglu, D. Sarı, O. Demircan, Y. E. Kalay, T. Öztürk, and Y. Kuru, “One pot synthesis of (La,Sr)CoO3/(La,Sr)2CoO4 for IT-SOFCs cathodes,” International Journal of Hydrogen Energy, pp. 18642–18649, 2018, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30033.