The design of cobalt-free cathode substance with unexceptionable electrochemical property and high thermochemical stability is an important target for IT-SOFC. In this work, the impact of some rare earth elements doping on the construction, TEC, DC conductivity and electrochemical properties of Nd_1.9Ln_0.1CuO₄ (Ln═La, Nd, Sm and Ce) are investigated. Nd_1.9Ln_0.1CuO₄ forms single tetragonal structure. The doped rare earth elements are found to have major influences to the cell parameter c, and the cell volumes decrease steadily when the doped elements change from lanthanum to cerium. XPS measurement certifies that Ce⁴⁺-doping facilitates the oxygen adsorption capacity on material surface. Among the studied Nd_1.9Ln_0.1CuO₄ materials, Nd_1.9Ce_0.1CuO₄ shows the highest surface oxygen adsorption capacity, the largest DC conductivity, and the compatible TEC values with that of Ce_0.9Gd_0.1O_1.95 (CGO) electrolyte. Meanwhile, the electrochemical impedance spectrum (EIS) result shows that Nd_1.9Ce_0.1CuO₄ has the highest electrocatalytic activity. The polarization resistance is 0.66 Ω cm² at 700 °C in air. And the CGO electrolyte supported single cell delivers a peak power density (PPD) of 283 mW.cm⁻² at 700 °C. The oxygen partial pressure depending EIS measurements prove that the oxygen reduction reaction limiting step is oxygen dissociation process on Nd_1.9Ce_0.1CuO₄.

具有无与伦比的电化学性能和高热化学稳定性的无钴阴极物质的设计是IT-SOFC的重要目标。在这项工作中，研究了一些稀土元素掺杂对Nd _1.9 Ln _0.1 CuO ₄（Ln═La，Nd，Sm和Ce）的结构，TEC，DC电导率和电化学性能的影响。Nd _1.9 Ln _0.1 CuO ₄形成单一的四边形结构。发现掺杂的稀土元素对晶胞参数c具有重要影响，并且当掺杂的元素从镧变成铈时，晶胞体积会稳定地减少。XPS测量证明Ce ⁴⁺掺杂促进了材料表面上的氧吸附能力。在研究的Nd _1.9 Ln _0.1 CuO ₄材料中，Nd _1.9 Ce _0.1 CuO ₄具有最高的表面氧吸附能力，最大的直流电导率以及与Ce _0.9 Gd _0.1 O _1.95（CGO）电解质兼容的TEC值。同时，电化学阻抗谱（EIS）结果表明，Nd _1.9 Ce _0.1 CuO ₄具有最高的电催化活性。极化电阻为0.66Ωcm ²在700°C的空气中。CGO电解质支持的单电池在700°C时的峰值功率密度（PPD）为283 mW.cm ^-2。依赖于氧分压的EIS测量结果证明，氧还原反应的限制步骤是在Nd _1.9 Ce _0.1 CuO ₄上进行氧离解过程。