Tailored and Improved Protonic Conductivity through Ba(Z<sub><i>x</i></sub>Ce<sub>10−<i>x</i></sub>)<sub>0.08</sub>Y<sub>0.2</sub>O<sub>3−δ</sub> Ceramics Perovskites Type Oxides for Electrochemical Devices

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  • Kwati Leonard
    International Institute for Carbon-Neutral Energy Research (I2CNER) Kyushu University 744 Motooka, Nishi-ku Fukuoka 819-0395 Japan
  • Yuji Okuyama
    Research Center for Sustainable Energy and Environmental Engineering Faculty of Engineering University of Miyazaki 1-1 Gakuenkibanadai Nishi 889-2192 Miyazaki Japan
  • Mariya E. Ivanova
    Institute of Energy- and Climate Research IEK-1 Forschungszentrum Jülich GmbH 52425 Jülich Germany
  • Wilhelm A. Meulenberg
    Institute of Energy- and Climate Research IEK-1 Forschungszentrum Jülich GmbH 52425 Jülich Germany
  • Hiroshige Matsumoto
    International Institute for Carbon-Neutral Energy Research (I2CNER) Kyushu University 744 Motooka, Nishi-ku Fukuoka 819-0395 Japan

Bibliographic Information

Published
2022-02-17
Resource Type
journal article
Rights Information
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/celc.202101663
Publisher
Wiley

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<jats:title>Abstract</jats:title><jats:p>Acceptor‐doped barium zirconate cerate electrolytes constitute prospective materials for highly efficient and environmentally friendly electrochemical devices. This manuscript employs a systematic approach to further optimize ionic conductivity in Ba(Zr<jats:sub><jats:italic>x</jats:italic></jats:sub>Ce<jats:sub>10−<jats:italic>x</jats:italic></jats:sub>)<jats:sub>0.08</jats:sub>Y<jats:sub>0.2</jats:sub>O<jats:sub>3−δ</jats:sub>, (1≤x≤9) oxides for moderate temperature electrolysis. We found two new composition variants by fixing a cerium/zirconium ratio of 5/4 at the perovskite B‐site with incremental zirconium, an observation that contrasts many reports suggesting a linear decrease in conductivity with increasing zirconium. As a result, the composition BaZr<jats:sub>0.44</jats:sub>Ce<jats:sub>0.36</jats:sub>Y<jats:sub>0.2</jats:sub>O<jats:sub>3−δ</jats:sub> demonstrates a superior ionic conductivity (10.1 mS cm<jats:sup>−1</jats:sup> at 500 °C) to stability trade‐off whereas, BaZr<jats:sub>0.16</jats:sub>Ce<jats:sub>0.64</jats:sub>Y<jats:sub>0.2</jats:sub>O<jats:sub>3−δ</jats:sub> exhibits the highest conductivity (11.5 mS cm<jats:sup>−1</jats:sup> at 500 °C) among the studied pellets. The high protonic conductivity is associated with a high degree of hydration, as confirmed by thermo‐gravimetric analysis. In addition, both compositions as electrolytes allow successful hydrogen production in a steam electrolyzer prototype. Electrolysis voltage as low as 1.3 V is attainable at current densities of 600 and 500 mA/cm<jats:sup>2</jats:sup> respectively at 600 °C, achieving 82 % current efficiencies with the later electrolyte.</jats:p>

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