Modifying the cathodes of intermediate-temperature solid oxide fuel cells with a Ce0.8Sm0.2O2 sol-gel coating

Title
Modifying the cathodes of intermediate-temperature solid oxide fuel cells with a Ce0.8Sm0.2O2 sol-gel coating
Authors
윤정우윤성필박상균한종희남석우임태훈김진수
Keywords
Intermediate-temperature solid oxide fuel cell; Ceria coating; Diffusion barrier layer; La0.8Sr0.2MnO3; La0.6Sr0.4Co0.2Fe0.8O3
Issue Date
2009-12
Publisher
International journal of hydrogen energy
Citation
VOL 34, NO 22, 9213-9219
Abstract
To increase the performance of solid oxide fuel cells operated at intermediate temperatures (<700 °C), we used the electronic conductor La0.8Sr0.2MnO3 (LSM) and the mixed conductor La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) to modify the cathode in the electrode microstructure. For both cathode materials, we employed a Sm0.2Ce0.8O2 (SDC) buffer layer as a diffusion barrier on the yttria-stabilized zirconia (YSZ) electrolyte to prevent the interlayer formation of SrZrO3 and La2Zr2O7, which have a poor ionic conductivity. These interfacial reaction products were formed only minimally at the electrolyte&#8211;cathode interlayer after sintering the SDC layer at high temperature; in addition, the degree of cathode polarization also decreased. Moreover to extend the triple phase boundary and improve cell performance at intermediate temperatures, we used sol&#8211;gel methods to coat an SDC layer on the cathode pore walls. The cathode resistance of the LSCF cathode cell featuring SDC modification reached as low as 0.11 Ω ㎠ in air when measured at 700 °C. The maximum power densities of the cells featuring the modified LSCF and LSM cathodes were 369 and 271 mW/㎠, respectively, when using O2 as the oxidant and H2 as the fuel.
URI
http://pubs.kist.re.kr/handle/201004/37032
ISSN
0360-3199
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