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Nanoengineered BSCF Cathode Materials for Intermediate-Temperature Solid-Oxide Fuel Cells
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- Darab, Mahdi (författare)
- KTH,Funktionella material, FNM
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- Toprak, Muhammet S. (författare)
- KTH,Funktionella material, FNM
- Syvertsen, Guttorm Ernst (författare)
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- (creator_code:org_t)
- The Electrochemical Society, 2009
- 2009
- Engelska.
- Ingår i: Journal of the Electrochemical Society. - : The Electrochemical Society. - 0013-4651 .- 1945-7111. ; 156:8, s. K139-K143
- Tidskriftsartikel (refereegranskat)
Abstract
Ämnesord
Stäng
- 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.
Nyckelord
- 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
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- ref (ämneskategori)
- art (ämneskategori)
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