Cr poisoning of the SUS interconnect and the solid oxide fuel cell electrode is one of the crucial hurdles to achieving system sustainability. Among various approaches to solving this issue, the suppression of cation segregation, especially Sr, and preventing the electrode surface from direct exposure to Cr-gas have been considered the most important factors. Herein, the effect of surface coating on mitigating Sr segregation as well as the use of strategies for protecting the electrode surface from exposure to Cr gas are discussed. Using Sm0.5Sr0.5CoO3(SSC) as a model film electrode and Gd0.1Ce0.9O2 (GDC) as the coating layer via a pulsed laser deposition (PLD) method, the Cr tolerance of the perovskite oxide electrode was enhanced. Electrochemical measurement at 650 °C for 200 h showed ∼2.5 times higher stability of the GDC-coated SSC electrode than the bare SSC electrode. Using Auger electron spectroscopy (AES), the chemical states of the GDC-coated SSC electrode were characterized, revealing significantly reduced Sr and Cr intensity on the surface of the coated electrode when compared to the bare SSC electrode.

中文翻译：

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通过 Gd0.1Ce0.9O2 表面改性提高钙钛矿氧化物的 Cr 耐受性

SUS 互连和固体氧化物燃料电池电极的铬中毒是实现系统可持续性的关键障碍之一。在解决这个问题的各种方法中，抑制阳离子偏析，尤其是 Sr，以及防止电极表面直接暴露于 Cr 气体被认为是最重要的因素。在此，讨论了表面涂层对减轻 Sr 偏析的影响以及保护电极表面免于暴露于 Cr 气体的策略的使用。使用 Sm0.5Sr0.5CoO3(SSC) 作为模型膜电极，Gd0.1Ce0.9O2 (GDC) 作为涂层，通过脉冲激光沉积 (PLD) 方法，提高了钙钛矿氧化物电极的 Cr 耐受性。在 650 °C 下进行 200 小时的电化学测量显示约 2。GDC 涂层 SSC 电极的稳定性比裸 SSC 电极高 5 倍。使用俄歇电子能谱 (AES) 表征了 GDC 涂层 SSC 电极的化学状态，与裸 SSC 电极相比，涂层电极表面的 Sr 和 Cr 强度显着降低。