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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
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Department of Energy Systems Research, Ajou University, Suwon 16499, Korea
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Department of Chemistry, Pukyong National University, 45 Yongso-ro, Nam-gu, Busan 48513, Korea
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Department of Energy Systems, Soonchunhyang University, Asan 31538, Korea
*
Authors to whom correspondence should be addressed.
Energies 2018, 11(11), 3083; https://doi.org/10.3390/en11113083
Received: 22 October 2018 / Revised: 1 November 2018 / Accepted: 5 November 2018 / Published: 8 November 2018
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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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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