Nanoengineered BSCF Cathode Materials for Intermediate-Temperature Solid-Oxide Fuel Cells
2009 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, Vol. 156, no 8, K139-K143 p.Article in journal (Refereed) Published
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.
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
IdentifiersURN: urn:nbn:se:kth:diva-18589DOI: 10.1149/1.3142430ISI: 000267798500073ScopusID: 2-s2.0-67650601983OAI: oai:DiVA.org:kth-18589DiVA: diva2:336636
QC 201005252010-08-052010-08-052010-12-17Bibliographically approved