Tuning LSAF Perovskite Morphology by Synthesis Method

Yıl 2021, Cilt: 8 Sayı: 2, 893 - 900, 31.12.2021

Rahmiye Zerrin Yarbay Şahin

https://doi.org/10.35193/bseufbd.975808

Öz

Lanthanum strontium aluminum ferrite (La0.8Sr0.2Al0.2Fe0.8O3±δ-LSAF) perovskites are drawing attention as cathodes in solid oxide fuel cells (SOFCs). The structural properties of these materials are mostly counting on the methods of preparation. In this study, two different preparation methods namely hydrothermal and sol-gel were applied to prepare LSAF perovskite. The characterization results including scanning electron microscopy (SEM), N2 adsorption-desorption, and Fourier transform infrared spectroscopy (FT-IR) are investigated in detail. The results showed that the preparation method played an important role on the microstructure of the LSAFs. It can be highlighted that the hydrothermal method is more successful in obtaining quite small nanoparticles.

Anahtar Kelimeler

LSAF, Hydrothermal Method, Nanopowder, Sol-gel Method

Sentez Yöntemi ile LSAF Perovskit Morfolojisinin Ayarlanması

Öz

Lantan stronsiyum alüminyum ferrit (La0.8Sr0.2Al0.2Fe0.8O3±δ-LSAF) perovskitleri, katı oksit yakıt hücrelerinde (KOYP) katot olarak dikkat çekmektedir. Bu malzemelerin yapısal özellikleri çoğunlukla hazırlama yöntemlerine dayanmaktadır. Bu çalışmada, LSAF perovskite hazırlamak için hidrotermal ve sol-jel olmak üzere iki farklı hazırlama yöntemi uygulanmıştır. Taramalı electron mikroskobu (SEM), N2 adsorpsiyon-desorpsiyon ve Fourier transform kızıl ötesi spektroskopisini (FT-IR) içeren karakterizasyon sonuçları detaylı olarak incelenmiştir. Sonuçlar, hazırlama yönteminin LSAF'lerin mikro yapısında önemli bir rol oynadığını göstermiştir. Oldukça küçük nano parçacıkların elde edilmesinde hidrotermal yöntemin daha başarılı olduğu görülmüştür.

Anahtar Kelimeler

LSAF, Hidrotermal Metot, Nanotoz, Sol-jel Metodu

Kaynakça

• Guimarães, A. O., Mansanares, A. M., Guimarães, V. F., PaesJr, H. R., & Vargas, H. (2013). Assessment of the thermal expansion mismatch in lanthanum strontium cobalt ferrite-yttria stabilized zirconia two-layers systems using photoacoustic methodology. Applied Physics Letters, 102(13), 131910.
• Coffey, G. W., Hardy, J., Pedersen, L. R., Rieke, P. C., Thomsen, E. C., & Walpole, M. (2003). Electrochemical properties of lanthanum strontium aluminum ferrites for the oxygen reduction reaction. Solid State Ionics, 158(1-2), 1-9.
• Coffey, G. W., Hardy, J. S., Pederson, L. R., Rieke, P. C., & Thomsen, E. C. (2003). Oxygen reduction activity of lanthanum strontium nickel ferrite. Electrochemical and Solid State Letters, 6(6), A121.
• Striker, T., Ruud, J. A., Gao, Y., Heward, W. J., & Steinbruchel, C. (2007). A-site deficiency, phase purity and crystal structure in lanthanum strontium ferrite powders. Solid State Ionics, 178(21-22), 1326-1336.
• Coffey, G., Hardy, J., Marina, O., Pederson, L., Rieke, P., & Thomsen, E. (2004). Copper doped lanthanum strontium ferrite for reduced temperature solid oxide fuel cells. Solid State Ionics, 175(1-4), 73-78.
• Berchmans, L. J., Leena, V., Amalajyothi, K., Angappan, S., & Visuvasam, A. (2009). Preparation of lanthanum ferrite substituted with Mg and Ca. Materials and Manufacturing Processes, 24(5), 546-549.
• Yarbay, R. Z., & Baykara, S. Z. (2011). Partial Substitution of Lanthanum with Silver and Strontium in the LaNiO3 Perovskite: Effect of the Preparation Method. Energy Challenges for Advanced Materials and Processes (ECAMP 2011). 25-29 Mayis, Niğde.
• Özbay, N., & Şahin, R. Z. Y. (2020). Effect of preparation method and B-side metal type on the physicochemical properties of LaBO3 perovskite catalyst and its catalytic behaviour in the biomass pyrolysis. Biomass Conversion and Biorefinery, 1-14.
• Şahin, R. Z. Y., & Özbay, N. (2021). Perspective on Catalytic Biomass Pyrolysis Bio-oils: Essential Role of Synergistic Effect of Metal Species Co-substitution in Perovskite Type Catalyst. Catalysis Letters, 151(5), 1406-1417.
• Kuai, L., Kan, E., Cao, W., Huttula, M., Ollikkala, S., Ahopelto, T., ... & Geng, B. (2018). Mesoporous LaMnO3+ δ perovskite from spray− pyrolysis with superior performance for oxygen reduction reaction and Zn− air battery. Nano Energy, 43, 81-90.
• Yarbay Şahin, R. Z. (2019). Effect of Calcination Temperature on the Perovskite Characteristics Prepared by Modified Pechini Method. Avrupa Bilim ve Teknoloji Dergisi, 17, 750-754.
• Yarbay, R. Z., Figen, H. E., & Baykara, S. Z. (2012). Effects of cobalt and nickel substitution on physical properties of perovskite type oxides prepared by the sol-gel citrate method. Acta Physica Polonica-Series A General Physics, 121(1), 44.
• Ifrah, S., Kaddouri, A., Gelin, P., & Leonard, D. (2007). Conventional hydrothermal process versus microwave-assisted hydrothermal synthesis of La1−xAgxMnO3+δ (x= 0, 0.2) perovskites used in methane combustion. Comptes Rendus Chimie, 10(12), 1216-1226.
• Koch, G., Hävecker, M., Teschner, D., Carey, S. J., Wang, Y., Kube, P., ... & Trunschke, A. (2020). Surface Conditions That Constrain Alkane Oxidation on Perovskites. ACS Catalysis, 10(13), 7007-7020.
• Hussain, F., Ahmad, M. A., Raza, R., Khan, M. A., Rehman, Z. U., Riaz, R. A., & Abbas, G. (2019). Electrochemical investigation of multi-fuel based low temperature nano-composite anode for solid oxide fuel cell. Journal of Power Sources, 425, 147-152.
• Özbay, N., & Şahin, R. Y. (2017, February). Preparation and characterization of LaMnO3 and LaNiO3 perovskite type oxides by the hydrothermal synthesis method. AIP Conference Proceedings, 1809(1), 020040.
• Sotomayor, F. J., Cychosz, K. A., & Thommes, M. (2018). Characterization of micro/mesoporous materials by physisorption: concepts and case studies. Acc. Mater. Surf. Res, 3(2), 34-50.
• Djoudi, L., Omari, M., & Madoui, N. (2012). Synthesis and characterization of lanthanum monoaluminate by co-precipitation method. EPJ Web of Conferences (Vol. 29, p. 00016). EDP Sciences.