Ruddlesden-Popper-type La₂NiO_4+δ oxide is considered as a potential cathode for solid oxide fuel cell applications. In this work, the tailoring possibility of the cathode material properties by doping with a small amount of Co has been investigated. The initial powders were synthesized by the self-propagating high-temperature synthesis method. The sintering kinetics, thermal expansion, electrical conductivity, catalytic activity of La₂Ni_1-xCo_xO_4+δ (0 ≤ x ≤ 0.3) as well as their interaction with Zr_0.84Y_0.16O_2-δ (YSZ) and Ce_0.73Gd_0.27O_2-δ (GDC) electrolytes have been studied. It was shown that the coefficient of thermal expansion of the investigated compositions increases with increasing the Co content. The Co doping leads to decreasing of La₂Ni_1-xCo_xO_4+δ conductivity in the temperature range below 600°С, whereas at higher temperatures, compositions with x = 0.2 and 0.3 have higher conductivity than La₂NiO₄. The polarization resistance of the cathodes in contact with YSZ increases with increasing the Co content. However, in contact with GDC the La₂Ni_0.8Co_0.2O_4+δ composition has the lowest polarization resistance of 0.4 Ω cm² (at 800 °C), which is 1.5 times less than that of La₂NiO_4+δ. Therefore, it was concluded that doping with the appropriate amount of Co could further improve the properties of lanthanum nickelate cathode.

Ruddlesden-Popper型La ₂ NiO _{4 +δ}氧化物被认为是固体氧化物燃料电池应用的潜在阴极。在这项工作中，已经研究了通过掺杂少量Co来定制正极材料性能的可能性。初始粉末通过自蔓延高温合成方法合成。La ₂ Ni _1-x Co _x O _{4 +δ}（0≤x≤0.3）的烧结动力学，热膨胀，电导率，催化活性以及它们与Zr _0.84 Y _0.16 O2 _-δ（YSZ）的相互作用铈_0.73 Gd _0.27 O2 _-δ（GDC）电解质已得到研究。结果表明，所研究的组合物的热膨胀系数随Co含量的增加而增加。Co掺杂导致在低于600℃的温度范围内La ₂ Ni _1-x Co _x O _{4 +δ}电导率降低，而在较高温度下，x = 0.2和0.3的组合物比La ₂ NiO ₄具有更高的电导率。与YSZ接触的阴极的极化电阻随Co含量的增加而增加。但是，与GDC接触时，La ₂ Ni _0.8 Co _0.2 O _{4 +δ}该组合物的最低极化电阻为0.4Ωcm ²（在800°C时），比La ₂ NiO _{4 +δ的}极化电阻小1.5倍。因此，可以得出结论，用适量的Co掺杂可以进一步改善镍酸镧阴极的性能。