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

Dae Sik Yun, Jaegyeom Kim, Seung-Joo Kim, Jong-Heun Lee, Jong-Nam Kim, Hyung Chul Yoon, Ji Haeng Yu, Minseok Kwak, Hana Yoon, Younghyun Cho and Chung-Yul Yoo
Additional contact information
Dae Sik Yun: Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon 34129, Korea
Jaegyeom Kim: Department of Energy Systems Research, Ajou University, Suwon 16499, Korea
Seung-Joo Kim: Department of Energy Systems Research, Ajou University, Suwon 16499, Korea
Jong-Heun Lee: Department of Materials Science and Engineering, Korea University, Seoul 02841, Korea
Jong-Nam Kim: Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon 34129, Korea
Hyung Chul Yoon: Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon 34129, Korea
Ji Haeng Yu: Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon 34129, Korea
Minseok Kwak: Department of Chemistry, Pukyong National University, 45 Yongso-ro, Nam-gu, Busan 48513, Korea
Hana Yoon: Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon 34129, Korea
Younghyun Cho: Department of Energy Systems, Soonchunhyang University, Asan 31538, Korea
Chung-Yul Yoo: Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon 34129, Korea

Energies, 2018, vol. 11, issue 11, 1-16

Abstract: For practical utilization of proton-conducting ceramic fuel cells and electrolyzers, it is essential to lower the sintering temperature and processing time of BaZrO 3 -based proton conductors. We investigated the effect of sintering temperature and time on the structural and electrochemical properties of dense BaZr 0.8 Y 0.2 O 3−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 BaY 2 NiO 5 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.

Keywords: proton-conducting oxides; BaZrO 3; electrochemical properties; solid-state reactive sintering (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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