Ce0.8Gd0.2O2 modification on La0.6Sr0.4Co0.2Fe0.8O3 cathode for improving a cell performance in intermediate temperature solid oxide fuel cells

Title
Ce0.8Gd0.2O2 modification on La0.6Sr0.4Co0.2Fe0.8O3 cathode for improving a cell performance in intermediate temperature solid oxide fuel cells
Authors
윤정우한종희윤성필박상균김희수남석우
Keywords
ITSOFC; Diffusion barrier layer; Ce0.8Gd0.2O2; La0.6Sr0.4Co0.2Fe0.8O3; Intermediate-temperature solid oxide fuel
Issue Date
2011-07
Publisher
Journal of industrial and engineering chemistry
Citation
VOL 17, 439-444
Abstract
To increase the cell performance of solid oxide fuel cells operated at intermediate temperature (600– 800 ℃), Ce0.8Gd0.2O2 (GDC) was applied to the La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) cathode in electrode microstructure using sol–gel coating. We employed a GDC as a diffusion barrier layer on the yttriastabilized zironia (YSZ) electrolyte to prevent the interlayer formation of SrZrO3, which has poor ionic conductivity. This interfacial reaction product was hardly formed at the electrolyte–cathode interlayer after sintering the GDC layer resulting to reduce the cathode polarization resistance. Moreover, we use sol–gel method to coat GDC thin layer through the cathode pore wall surface to extend the triple phase boundary (TPB) area. The cathode polarization resistance also reduced due to the additional TPB area. For the single cell featuring LSCF cathode modified with GDC sol–gel coating, the maximum densities were 0.41 W/㎠ and 0.89 W/㎠ at 700 ℃ and 800 ℃.
URI
http://pubs.kist.re.kr/handle/201004/40072
ISSN
1226-086x
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KIST Publication > Article
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