Ceria interlayer-free Ba0.5Sr0.5Co0.8Fe0.2O3-δ-Sc0.1Zr0.9O1.95 composite cathode on zirconia based electrolyte for intermediate temperature solid oxide fuel cells

Title
Ceria interlayer-free Ba0.5Sr0.5Co0.8Fe0.2O3-δ-Sc0.1Zr0.9O1.95 composite cathode on zirconia based electrolyte for intermediate temperature solid oxide fuel cells
Authors
이승오이대희정인용김동하현상훈김주선문주호
Keywords
composite cathode; BSCF; SOFCs; Interlayer-free; Zirconia-based electrolyte
Issue Date
2013-07
Publisher
International journal of hydrogen energy
Citation
VOL 38, NO 22, 9320-9329
Abstract
We synthesized Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF) powders with a primary particle size of 20 nm using a Pechini type method. By using nanocrystalline BSCF powders, we were able to fabricate a ceria interlayer-free nanoporous cathode on a scandia stabilized zirconia (ScSZ) electrolyte at low temperatures. Cathodes sintered below 750 °C lacked sufficient mechanical adhesion to the electrolyte, while electrode was well adhered to the electrolyte when fired at 800 °C. The symmetrical BSCF-ScSZ; yttria stabilized zirconia (YSZ); BSCF-ScSZ half-cell that we generated had an exceptionally low polarization resistance of 0.06 Ω·㎠ at 700 °C. The maximum power density of the BSCF-ScSZ; ScSZ; Ni-ScSZ unit cell was over 1 W cm−2 at 700 °C. We investigated the durability of the BSCF-ScSZ composite cathode by 30 thermo-cycles performed by varying the temperature from 200 to 700 °C. The polarization resistance after the test remained low at less than 0.08 Ω·cm2.
URI
http://pubs.kist.re.kr/handle/201004/45129
ISSN
03603199
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