TY - JOUR
T1 - High Proton Conductivity in Ba5Er2Al2ZrO13, a Hexagonal Perovskite-Related Oxide with Intrinsically Oxygen-Deficient Layers
AU - Murakami, Taito
AU - Hester, James R.
AU - Yashima, Masatomo
N1 - Funding Information:
We thank H. Yaguchi, Y. Yasui, and H. Tejima for their help in electrical conductivity measurements and diffraction experiments. We also thank K. Fujii for the arrangement of neutron-diffraction experiments. We acknowledge Kojundo Chemical Laboratory Co., Ltd. for the ICP-AES and XPS analyses. We express special thanks to Shin-Etsu Chemical Co. for supplying the rare earth oxides. The neutron-diffraction measurements were carried out by project approval (No. 8199). This work and travel expenses were supported by Grant-in-Aid for Scientific Research (KAKENHI, JP16H06293, JP16H06440, JP16H06441, JP16H06438, JP16K21724, JP17H06222, JP19H00821, and 19K23647) from the Ministry of Education, Culture, Sports, Science and Technology of Japan. and JSPS Core-to-Core Program, A. Advanced Research Networks (Solid Oxide Interfaces for Faster Ion Transport), and the Institute for Solid State Physics, the University of Tokyo. T.M. acknowledges support from the Izumi Science and Technology Foundation and the Iwatani Naoji Foundation.
Publisher Copyright:
© 2020 American Chemical Society.
PY - 2020/7/8
Y1 - 2020/7/8
N2 - For the development of proton-based electrolytes, high proton conductivity at intermediate temperatures (300-600 °C) is crucial, but the available materials have been confined to a limited number of the structure families, such as cubic perovskites. Herein, we report Ba5Er2Al2ZrO13, a hexagonal perovskite-related oxide, as a new class of proton conductors exhibiting higher conductivities than 10-3 S cm-1 between 300 and 1200 °C. The protons as charge carriers are found to exist in the inherently oxygen-deficient h′ layer of Ba5Er2Al2ZrO13, which are supported by Rietveld analysis of neutron-diffraction data, bond-valence-based energy calculations, and thermogravimetric analysis. Our discovery of a new structure family of proton conductors with the inherently oxygen-deficient h′ layer offers a strategy in designing superior proton conductors based on hexagonal perovskite-related oxides.
AB - For the development of proton-based electrolytes, high proton conductivity at intermediate temperatures (300-600 °C) is crucial, but the available materials have been confined to a limited number of the structure families, such as cubic perovskites. Herein, we report Ba5Er2Al2ZrO13, a hexagonal perovskite-related oxide, as a new class of proton conductors exhibiting higher conductivities than 10-3 S cm-1 between 300 and 1200 °C. The protons as charge carriers are found to exist in the inherently oxygen-deficient h′ layer of Ba5Er2Al2ZrO13, which are supported by Rietveld analysis of neutron-diffraction data, bond-valence-based energy calculations, and thermogravimetric analysis. Our discovery of a new structure family of proton conductors with the inherently oxygen-deficient h′ layer offers a strategy in designing superior proton conductors based on hexagonal perovskite-related oxides.
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U2 - 10.1021/jacs.0c02403
DO - 10.1021/jacs.0c02403
M3 - Article
C2 - 32413262
AN - SCOPUS:85087712561
SN - 0002-7863
VL - 142
SP - 11653
EP - 11657
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 27
ER -