Efficient intermediate-temperature steam electrolysis with Y:SrZrO3-SrCeO3 and Y:BaZrO3-BaCeO3 proton conducting perovskites

Kwati Leonard, Yuji Okuyama, Yasuhiro Takamura, Young Sung Lee, Kuninori Miyazaki, Mariya E. Ivanova, Wilhelm A. Meulenberg, Hiroshige Matsumoto

    Research output: Contribution to journalArticlepeer-review

    14 Citations (Scopus)

    Abstract

    Ceramic proton conductors have the potential to become important components in future clean and efficient energy technologies. In this manuscript, barium cerium yttrium zirconate (Ba(Zr0.5Ce0.4)8/9Y0.2O2.9) and strontium cerium yttrium zirconate (SrZr0.5Ce0.4Y0.1O2.95), proton conducting perovskites were employed as solid oxide electrolysis cell (SOEC) electrolytes for hydrogen production via intermediate temperature steam electrolysis at 550 and 600 °C. Cathode-supported button cells examined for a 12 μm Ba(Zr0.5Ce0.4)8/9Y0.2O2.9 electrolyte, with Ni-SrZr0.5Ce0.4Y0.1O2.95 as the H2-electrode, and porous Ba0.5La0.5CoO3 as the anode reached current densities of 0.2 and 0.5 A cm-2 with applied voltage of 1.45 V, at 550 and 600 °C, respectively. Moreover, a hydrogen evolution rate of 127 μmol cm-2 per minute was achieved at 0.5 A cm-2, translating to a current efficiency of 82%. In addition, excellent cell performance was obtained using SrZr0.5Ce0.4Y0.1O2.95 as an electrolyte. Current densities of 0.2 and 0.5 A cm-2 were obtained at 600 °C with applied voltages of 1.28 and 1.63 V, achieving faradaic current efficiencies of 88 and 85%. The NiO-SrZr0.5Ce0.4Y0.1O3-δ composite cathode was more favorable for the densification of the supported Ba(Zr0.5Ce0.4)8/9Y0.2O2.9 electrolyte during sintering and could be promising for use as a cathode substrate in proton-conducting SOECs.

    Original languageEnglish
    Pages (from-to)19113-19124
    Number of pages12
    JournalJournal of Materials Chemistry A
    Volume6
    Issue number39
    DOIs
    Publication statusPublished - Jan 1 2018

    All Science Journal Classification (ASJC) codes

    • Chemistry(all)
    • Renewable Energy, Sustainability and the Environment
    • Materials Science(all)

    Fingerprint Dive into the research topics of 'Efficient intermediate-temperature steam electrolysis with Y:SrZrO<sub>3</sub>-SrCeO<sub>3</sub> and Y:BaZrO<sub>3</sub>-BaCeO<sub>3</sub> proton conducting perovskites'. Together they form a unique fingerprint.

    Cite this