This study is focused on the development of layered perovskites based alternative oxygen electrodes for high temperature Solid Oxide Electrolysis Cells (SOECs). In this respect, rare earth nickelates Ln₂NiO_4+δ (Ln = La, Pr or Nd) have taken considerable attention due to their good electrochemical properties resulting from high oxide ion diffusivity and a large surface exchange rate. Among them, Pr₂NiO_4+δ (PNO) shows the best electrochemical properties, however, it displays relatively higher degradation rate under SOEC operation at high current density. Therefore, in this work, we perform further modification by substituting nickel by cobalt in order to enhance the physico-chemical properties, electrochemical performance and most importantly the durability of SOECs. Three compositions (x = 0.0, 0.1 and 0.2) are prepared and characterized using different techniques. The electrochemical measurements are performed with symmetrical as well as single cells using DC- and AC-techniques in the 700–900 °C temperature range. The electrode reaction mechanism is also examined by recording the impedance spectra at different pO₂. An improvement in electrochemical performance as well as lower degradation rate is observed with cobalt substitution, during short term SOEC operation at −1 A⋅cm⁻² current density at 800 °C with 50% H₂ and 50% H₂O feed gas mixture.

这项研究的重点是用于高温固态氧化物电解槽（SOEC）的基于钙钛矿的层状替代氧电极的开发。在这方面，稀土镍酸盐Ln ₂ NiO _{4+ δ}（Ln = La，Pr或Nd）由于其高的氧化物离子扩散性和较大的表面交换速率而具有良好的电化学性能，因此受到了广泛的关注。其中，Pr ₂ NiO _{4+ δ}（PNO）表现出最佳的电化学性能，但是，在高电流密度的SOEC操作下，其降解速率相对较高。因此，在这项工作中，我们通过用钴代替镍来进行进一步的改性，以提高物理化学性能，电化学性能以及最重要的是提高SOEC的耐久性。 制备了三种成分（x = 0.0、0.1和0.2），并使用不同的技术进行了表征。在700-900°C的温度范围内，使用DC和AC技术对对称电池和单电池进行电化学测量。还可以通过记录不同p O _2下的阻抗谱来检查电极反应机理。使用50％H ₂和50％H ₂ O进料混合气在800°C下以-1A⋅cm ^-2的电流密度进行短期SOEC操作期间，在钴替代条件下，电化学性能得到了改善，降解速率降低了，。