The chemical and electrochemical stability of lanthanide nickelates La₂NiO_4+δ (LNO), Pr₂NiO_4+δ (PNO) and their mixed compounds La_2-xPr_xNiO_4+δ (LPNOs) with x = 0.5, 1 or 1.5 is reported. The aim is to promote these materials as efficient electrodes for solid oxide fuel cell (SOFC) and/or solid oxide electrolysis cell (SOEC). La₂NiO_4+δ and La_1.5Pr_0.5NiO_4+δ compounds are chemically very stable as powders over one month in the temperature range 600 − 800°C, while the other materials rich in praseodymium progressively decompose into various perovskite-deriving components with additional Pr₆O₁₁. Despite their uneven properties, all these materials are quite efficient and sustainable as electrodes on top of gadolinium doped ceria (GDC_BL) // yttrium doped zirconia (8YSZ) electrolyte, for one month at 700°C without polarization. Under polarization (300 mA·cm⁻²), the electrochemical performances of LNO, PNO and La_1.5Pr_0.5NiO_4+δ (LP5NO) quickly degrade in SOFC mode, i.e. for the oxygen reduction reaction, while they show durability in SOEC mode, i.e. for the oxide oxidation reaction.

镧系元素镍酸盐La ₂ NiO _{4 +δ}（LNO），Pr ₂ NiO _{4 +δ}（PNO）及其混合化合物La _{2- x} Pr _x NiO _{4 +δ}（LPNOs）的化学和电化学稳定性x  = 0.5，1或报告1.5。目的是促进这些材料作为固体氧化物燃料电池（SOFC）和/或固体氧化物电解电池（SOEC）的有效电极。La ₂ NiO _{4 +δ}和La _1.5 Pr _0.5 NiO _{4 +δ}化合物在600到800的温度范围内，在一个月内的粉末化学稳定性非常好℃，而其他富含rich的材料则与其他Pr ₆ O ₁₁一起逐渐分解为各种钙钛矿衍生组分。尽管它们的性能参差不齐，但作为as掺杂二氧化铈（GDC _BL）//钇掺杂氧化锆（8YSZ）电解质顶部的电极，所有这些材料在700个月的使用寿命中都是非常有效且可持续的°C无极化。在极化（300 mA·cm ^-2）下，LNO，PNO和La _1.5 Pr _0.5 NiO _{4 +δ}（LP5NO）的电化学性能在SOFC模式下即氧还原反应中迅速降解，而在SOEC模式下则表现出耐久性，即用于氧化物氧化反应。