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http://dx.doi.org/10.4191/KCERS.2005.42.4.269

Effect of Cathode Porosity of Mixed Conducting (La0.6Sr0.4Co0.2Fe0.8O3) on the Power Generating Characteristics of Anode Supported SOFCs  

Yun, Joong-Cheul (Department of Materials Science and Engineering, Korea University, Nano-Materials Research Center, KIST)
Kim, Woo-Sik (Nano-Materials Research Center, KIST)
Kim, Hyoungchul (Nano-Materials Research Center, KIST)
Lee, Jong-Ho (Nano-Materials Research Center, KIST)
Kim, Joosun (Nano-Materials Research Center, KIST)
Lee, Hae-Weon (Nano-Materials Research Center, KIST)
Kim, Byong-Ho (Department of Materials Science and Engineering, Korea University)
Publication Information
Journal of the Korean Ceramic Society / v.42, no.4, 2005 , pp. 269-275 More about this Journal
Abstract
We analyzed the unit cell performance against the cathode porosity, which is supposed to be closely related with active sites for the cathode reaction. In order to fabricate the unit cells with different porosity in the cathode layer we changed the mixing ratio of fine and coarse LSCF cathode powders. The final porosity of each cathode layer was 14, 23, 27, $39\%$ respectively. According to the electrochemical analysis of unit cell performance via DC current interruption and AC impedance method, the electrodic polarization resistance was diminished as the cathode porosity increased. The decrease of polarization resistance was attributed due to the increase of active reaction sites and the enhancement of overall unit cell performance could be explained in the same line.
Keywords
SOFC; Mixed conducting cathode; LSCF; Unit cell performance; Polarization;
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