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Elsevier, Journal of Alloys and Compounds, (621), p. 263-267, 2015

DOI: 10.1016/j.jallcom.2014.09.207

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The effects of NiO addition on the structure and transport properties of proton conducting BaZr0.8Y0.2O3−δ

Journal article published in 2015 by Chung-Yul Yoo, Dae Sik Yun, Jong Hoon Joo, Ji Haeng Yu
This paper is available in a repository.
This paper is available in a repository.

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Abstract

20 mol% yttrium doped barium zirconate, BaZr0.8Y0.2O3−δ (BZY), a proton-conducting electrolyte with 2 wt.% NiO, has been successfully prepared by a solid state reaction and sintered at 1450 °C for 5 h. The pellets sintered under O2 show relative density higher than 95%. The total conductivity of BZY with 2 wt.% NiO in wet Ar is 3.1 x 10−3 S cm−1 at 600 °C, which is similar to values previously reported for BZY with the aid of sintering and smaller than that of pristine BZY. The hydration constant of BZY with 2 wt.% NiO is determined by thermogravimetry and the obtained result is in good agreement with pristine BZY. The total ion transport number of BZY with 2 wt.% NiO exceeds 0.92 at temperature of 500-800 °C. The maximum power density of the electrolyte supported cell (Pt/BZY/Pt) is 5.5 mW cm−2 at 700 °C, which is comparable to the pristine BZY electrolyte supported cell.