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Lookup NU author(s): Dr Alan Thursfield
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Samaria-doped ceria (SDC, Ce0.8Sm0.2O1.9) ceramic powders of submicrometer size were synthesized by a sol-gel auto-combustion method. From these powders microtubes with a dual structure comprising of a dense layer and a porous substrate layer were fabricated in a single step through a phase inversion/sintering technique. A sintering temperature in excess of 1450 degrees C is required for SDC to achieve gastight microtubes. The mechanical strength of the SDC microtubes increases with increasing sintering temperature and may attain up to 208 MPa when sintered at 1500 degrees C. Electrical impedance spectroscopy studies indicate that the SDC microtubes have electrical conductivities of 4.46 x 10-4-0.072 S/cm and corresponding activation energy of 81.9 kJ/mol at temperatures between 400 degrees and 800 degrees C. Full fuel cells were fabricated by coating Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) on to the inner surface and a Ni-SDC cermet on to the outer surface of the gastight microtubes to act as the cathode and the anode, respectively. The resultant BSCF|SDC|Ni-SDC microcells have a stable output maximum of 106 mW/cm2 at 750 degrees C when hydrogen and air were used as fuel and oxidant gas, respectively.
Author(s): Yang NT, Tan XY, Ma ZF, Thursfield A
Publication type: Article
Publication status: Published
Journal: Journal of The American Ceramic Society
ISSN (print): 0002-7820
ISSN (electronic): 1551-2916
Publisher: Wiley-Blackwell Publishing, Inc.
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