Solid oxide cells operated reversibly or in electrolysis mode are promising for energy storage, but oxygen electrode degradation is an issue. Prior stability studies have focused on the widely-used powder-processed perovskite oxide electrodes in devices operating at ≥ 700 °C. Here we provide initial results on a different type of electrode designed for lower temperature – the Ruddlesden-Popper material La₂NiO₄ with a nano-scale structure produced by infiltration into a La_0.9Sr_0.1Ga_0.8Mg_0.2O₃ scaffold. Life tests were performed in air at 650 °C on symmetric cells with La_0.9Sr_0.1Ga_0.8Mg_0.2O₃ electrolytes with the current direction reversed every 6 h over 1000 h. The voltage degradation rate increased from ∼3%/kh at a current density of 1.0 A/cm² to ∼15%/kh at 2.0 A/cm². EIS measurements revealed that both the ohmic and polarization resistances increased more rapidly at the higher current density. Post-test observations showed no electrode delamination, but increased current density caused a change in the La₂NiO₄ nano-structure, along with evidence of electrolyte fracture.

可逆操作或以电解模式操作的固体氧化物电池有望用于能量存储，但是氧电极的降解是一个问题。先前的稳定性研究集中于在≥700°C的设备中使用的广泛使用的粉末处理钙钛矿氧化物电极。在此，我们提供了针对低温设计的另一种类型电极的初步结果-Ruddlesden-Popper材料La ₂ NiO ₄具有纳米结构，通过渗入La _0.9 Sr _0.1 Ga _0.8 Mg _0.2 O ₃支架产生。寿命测试是在650°C的空气中于La _0.9 Sr _0.1 Ga _0.8的对称电池上进行的Mg _0.2 O ₃电解质在1000 h内每6 h电流方向反转一次。电压衰减率从电流密度1.0 A / cm ^2时的约3％/ kh增加到2.0 A / cm ^2时的约15％/ kh 。EIS测量表明，在较高的电流密度下，欧姆电阻和极化电阻均增加得更快。测试后的观察结果表明没有电极分层，但是电流密度的增加导致La ₂ NiO ₄纳米结构的变化，以及电解质破裂的迹象。