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Energies 2018, 11(11), 3083; https://doi.org/10.3390/en11113083

Structural and Electrochemical Properties of Dense Yttria-Doped Barium Zirconate Prepared by Solid-State Reactive Sintering

1
Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon 34129, Korea
2
Department of Materials Science and Engineering, Korea University, Seoul 02841, Korea
3
Department of Energy Systems Research, Ajou University, Suwon 16499, Korea
4
Department of Chemistry, Pukyong National University, 45 Yongso-ro, Nam-gu, Busan 48513, Korea
5
Department of Energy Systems, Soonchunhyang University, Asan 31538, Korea
*
Authors to whom correspondence should be addressed.
Received: 22 October 2018 / Revised: 1 November 2018 / Accepted: 5 November 2018 / Published: 8 November 2018
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Abstract

For practical utilization of proton-conducting ceramic fuel cells and electrolyzers, it is essential to lower the sintering temperature and processing time of BaZrO3-based proton conductors. We investigated the effect of sintering temperature and time on the structural and electrochemical properties of dense BaZr0.8Y0.2O3−δ (BZY) prepared by a solid-state reactive sintering process, using NiO as a sintering aid. The sintered BZY prepared from the micronized precursor powder exhibited a density higher than 93%, and an average grain size in the range of 0.6 to 1.4 μm. The orthorhombic BaY2NiO5 phase was also observed in the sintered BZY from the combined conventional and synchrotron X-ray diffraction measurements. Electrochemical impedance spectroscopy showed that the total proton conductivities of BZY can be modulated by sintering temperature in a wet reducing atmosphere. The maximum total ion transport number achieved was 0.89 at 600 °C, and the maximum power density of the symmetric BZY electrolyte supported cell with Pt electrodes was 5.24 mW·cm−2 at 900 °C. View Full-Text
Keywords: proton-conducting oxides; BaZrO3; electrochemical properties; solid-state reactive sintering proton-conducting oxides; BaZrO3; electrochemical properties; solid-state reactive sintering
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Yun, D.S.; Kim, J.; Kim, S.-J.; Lee, J.-H.; Kim, J.-N.; Yoon, H.C.; Yu, J.H.; Kwak, M.; Yoon, H.; Cho, Y.; Yoo, C.-Y. Structural and Electrochemical Properties of Dense Yttria-Doped Barium Zirconate Prepared by Solid-State Reactive Sintering. Energies 2018, 11, 3083.

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