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J. Korean Ceram. Soc. > Epub ahead of print

doi: https://doi.org/10.4191/kcers.2019.56.1.03    [Epub ahead of print]
Effect of Nickel Addition on Sintering Behavior and Electrical Conductivity of BaCe0.35Zr0.5Y0.15O3-δ
Hyegsoon An1,2, Dongwook Shin2,3, Ho-Il Ji1
1High-temperature Energy Materials Research Center, Korea Institute of Science and Technology, Seoul 02792, Korea
2Department of Fuel Cells and Hydrogen Technology, Hanyang University, Seoul 04763, Korea
3Division of Materials Science and Engineering, Hanyang University, Seoul 04763, Korea
Correspondence  Ho-Il Ji ,Tel: +82-2-958-5521, Fax: +82-2-958-5529, Email: hiji@kist.re.kr
Received: November 12, 2018; Revised: November 14, 2018   Accepted: November 16, 2018.  Published online: December 19, 2018.
ABSTRACT
The effect of different Ni-containing additives on the sintering behavior and electric conductivity of the proton conducting electrolyte BaCe0.35Zr0.5Y0.15O3-δ (BCZY5) was investigated. Ni-doped, NiO-added, and BaY2NiO5(BYN)-added (all 4 mol%) BCZY5 samples were prepared by the solid state synthesis method and sintered at 1400°C for 6 h. Among the three samples, the onset of densification was observed at the lowest temperature for NiO-added BCZY5, which is attributed to the formation of an intermediate phase at a low melting temperature. The BYN-added sample, where no consumption of the constitutional elements of the electrolyte was expected during sintering, exhibited the highest electrical conductivity whereas the doped sample had the lowest conductivity. The electrical conductivities at 500°C under humid argon atmosphere were measured to be 2.0, 4.8, and 6.2 mS·cm−1 for Ni-doped and NiO- and BYN-added samples, respectively.
Key words: Proton conducting electrolyte, Sintering aid, BCZY, Conductivity, PCFC
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