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J. Korean Ceram. Soc. > Volume 51(4); 2014 > Article
Journal of the Korean Ceramic Society 2014;51(4): 265.
doi: https://doi.org/10.4191/kcers.2014.51.4.265
Electrochemical Properties of La4Ni3O10-GDC Composite Cathode by Facile Sol-gel Method for IT-SOFCs
Sihyuk Choi, Guntae Kim
Department of Energy Engineering, Ulsan National Institute of Science and Technology (UNIST)
Among the Ruddlesden-Popper series, $La_4Ni_3O_{10}$ has received widespread attention as a promising cathode material by reason of its favorable properties for realizing high performance of intermediate temperature solid oxide fuel cells (IT-SOFCs). The $La_4Ni_3O_{10}$ cathode is prepared using the facile sol-gel method by employing tri-blockcopolymer (F127) to obtain a single phase in a short sintering time. There are no reactions between the $La_4Ni_3O_{10}$ cathode and the $Ce_{0.9}Gd_{0.1}O_{2-delta}$ (GDC) electrolyte upon sintering at $1000^{circ}C$, indicating that the $La_4Ni_3O_{10}$ cathode has good chemical compatibility with the GDC electrolyte. The maximum electrical conductivity of $La_4Ni_3O_{10}$ reaches approximately 240 S $cm^{-1}$ at $100^{circ}C$ and gradually decreases with increasing temperaturein air atmosphere. The area specific resistance value of $La_4Ni_3O_{10}$ composite with 40 wt% GDC is $0.435{Omega}cm^2$ at $700^{circ}C$. These data allow us to propose that the $La_4Ni_3O_{10}$-GDC composite cathode is a good candidate for IT-SOFC applications.
Key words: Solid oxide fuel cell, Cathode, Ruddlesden-Popper, Tri-blockcopolymer (F127)
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