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<p>In this study, degradation behaviors of three current collectors, namely Ag mesh, Ni–Co-coated Crofer mesh, and Cu–Mn alloy foam, were tested in protonic ceramic electrolysis cells (PCECs) under high steam concentration (40% for 100&#xa0;h followed by 50% for 100&#xa0;h) at 1.3&#xa0;V. The Ag mesh cell showed the most stable performance, maintaining structural and chemical stability. The Ni–Co-coated Crofer mesh cell underwent substantial degradation while the Cu–Mn foam cell demonstrated moderate performance degradation in the initial 100-h test, followed by a slight performance improvement in the later 100-h test. Post-mortem analyses revealed that Ni and Fe in the Crofer mesh were oxidized to Ni(II)-O and Fe(III)-O under high-steam-concentration conditions, while the Cu–Mn foam underwent a favorable electronic transition (Cu<sup>2</sup>⁺/Mn<sup>3</sup>⁺ → Cu⁺/Mn<sup>4</sup>⁺) leading to the formation of a stable spinel oxide which stabilized the surface and promoted effective charge transport. These results highlight the potential of the Cu–Mn foam as a robust non-noble-metal current collector for PCECs that offers enhanced oxidation resistance and electrochemical durability under high-steam-concentration conditions.</p>

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Comparative studies of air-electrode current collectors for protonic ceramic electrolysis cells under high-steam-concentration conditions

  • 期刊论文

  • 发表日期：

    2025年8月10日

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  • Junho Jo,
  • Dongwan Jin,
  • Jun-Young Park,
  • Hyung-Tae Lim

摘要

In this study, degradation behaviors of three current collectors, namely Ag mesh, Ni–Co-coated Crofer mesh, and Cu–Mn alloy foam, were tested in protonic ceramic electrolysis cells (PCECs) under high steam concentration (40% for 100 h followed by 50% for 100 h) at 1.3 V. The Ag mesh cell showed the most stable performance, maintaining structural and chemical stability. The Ni–Co-coated Crofer mesh cell underwent substantial degradation while the Cu–Mn foam cell demonstrated moderate performance degradation in the initial 100-h test, followed by a slight performance improvement in the later 100-h test. Post-mortem analyses revealed that Ni and Fe in the Crofer mesh were oxidized to Ni(II)-O and Fe(III)-O under high-steam-concentration conditions, while the Cu–Mn foam underwent a favorable electronic transition (Cu2⁺/Mn3⁺ → Cu⁺/Mn4⁺) leading to the formation of a stable spinel oxide which stabilized the surface and promoted effective charge transport. These results highlight the potential of the Cu–Mn foam as a robust non-noble-metal current collector for PCECs that offers enhanced oxidation resistance and electrochemical durability under high-steam-concentration conditions.