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Nanoengineered BSCF Cathode Materials for Intermediate-Temperature Solid-Oxide Fuel Cells
KTH, School of Information and Communication Technology (ICT), Material Physics, Functional Materials, FNM.
KTH, School of Information and Communication Technology (ICT), Material Physics, Functional Materials, FNM.ORCID iD: 0000-0001-5678-5298
KTH, School of Information and Communication Technology (ICT), Material Physics, Functional Materials, FNM.
2009 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, Vol. 156, no 8, K139-K143 p.Article in journal (Refereed) Published
Abstract [en]

A recently reported promising cathode material for solid-oxide fuel cells (SOFCs), namely, BaxSr1-xCoyFe1-yO3-delta (BSCF) is fabricated in nanocrystalline form by a chemical alloying approach. The approach is comprised of solution chemical synthesis of a precursor and its thermochemical processing toward the desired phase. All the constituent elements, Ba, Sr, Co, and Fe, were coprecipitated from an aqueous solution of their salts to produce a precursor with a well-defined composition, fine particle size, high homogeneity, and high reactivity. After calcining and sintering at 1000 degrees C, the individual oxides were alloyed into nanostructured perovskite (with x=0.5 and y=0.2) Ba0.5Sr0.5Co0.2Fe0.8O3 of high purity. Spark plasma sintering was used for compaction to preserve the material's nanostructure, and sintered compacts demonstrated a significant increase in electrical conductivity values at temperatures up to 900 degrees C, compared to the earlier reports. The measured conductivity values are sufficiently high for cathode applications with a maximum of about 63 S cm(-1) at 430 degrees C in air and 25 S cm(-1) at 375 degrees C in N-2, respectively. These values are about twice as high as conventional BSCF mainly due to the reduction in interfacial resistance, implying a high promise for nanoengineered BSCF as cathode material at low or intermediate-temperature SOFCs.

Place, publisher, year, edition, pages
2009. Vol. 156, no 8, K139-K143 p.
Keyword [en]
alloying, barium compounds, calcination, cobalt compounds, electrical, conductivity, electrochemical electrodes, nanostructured materials, nanotechnology, particle size, plasma materials processing, sintering, solid oxide fuel cells, strontium compounds, surface resistance, thermochemistry, electrical-properties, phase-structure, ba0.5sr0.5co0.8fe0.2o3-delta, performance, sofcs, conductivity, membranes
URN: urn:nbn:se:kth:diva-18589DOI: 10.1149/1.3142430ISI: 000267798500073ScopusID: 2-s2.0-67650601983OAI: diva2:336636
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2010-12-17Bibliographically approved

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Darab, MahdiToprak, Muhammet S.Muhammed, Mamoun
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