Department of Materials Science and Engineering, Inha University, Incheon 22212, Korea.
J Nanosci Nanotechnol. 2021 Jul 1;21(7):3842-3846. doi: 10.1166/jnn.2021.19232.
Solid oxide electrolyzer cells with an Ni-Fe-yttria-stabilized zirconia (Ni-Fe-YSZ) hydrogen electrode as the cathode, lanthanum strontium ferrite (LSCF)-gadolinia-doped ceria (GDC) air electrode as the anode, and YSZ as the electrolyte were fabricated, and the oxidation protection effect of sacrificial Fe particles was investigated. X-ray diffraction analysis indicated that Ni was protected from oxidation under a water vapor atmosphere by sacrificial Fe. Scanning electron microscopy observations suggested that the Ni particles accumulated in the Ni-YSZ hydrogen electrode, which might have been associated with the partial oxidation of Ni during cell operation at 700 °C in 50% H₂O/15% H₂/35% Ar atmosphere. No appreciable microstructural changes were observed for the Ni-Fe-YSZ hydrogen electrode. Furthermore, the presence of the sacrificial Fe particles could be responsible for the superior durability of the cell, compared with that of the cell featuring the conventional Ni-YSZ hydrogen electrode.
采用 Ni-Fe-氧化钇稳定氧化锆（Ni-Fe-YSZ）作为阴极、镧锶铁氧体（LSCF）-氧化钆掺杂氧化铈（GDC）作为空气电极、YSZ 作为电解质，制备了固体氧化物电解池，并研究了牺牲 Fe 颗粒的氧化保护作用。X 射线衍射分析表明，牺牲 Fe 可在水蒸气气氛中保护 Ni 不被氧化。扫描电子显微镜观察表明，Ni 颗粒在 Ni-YSZ 氢电极中聚集，这可能与 50%H₂O/15%H₂/35%Ar 气氛中，电池在 700°C 下运行时 Ni 的部分氧化有关。Ni-Fe-YSZ 氢电极未观察到明显的微观结构变化。此外，与采用传统 Ni-YSZ 氢电极的电池相比，牺牲 Fe 颗粒的存在可能是电池具有更好耐久性的原因。
