The influence of Ca and Co doping in the Ruddlesden ‒ Popper series of oxide Sr_2.7-xCa_xLn_0.3Fe_2-yCo_yO_7-δ with x = 0 and 0.3, y = 0 and 0.6, and Ln = La and Nd on the electrical and thermal properties, catalytic activity for the oxygen reduction reaction (ORR) in solid oxide fuel cells (SOFC), and phase stability has been investigated. The Co-substituted samples display an increase in oxygen vacancies, electrical conductivity, thermal expansion coefficient, and electrocatalytic activity for both Ln = La and Nd. Although Ca doping in the Sr site slightly reduces the oxygen loss and thermal expansion coefficient, the symmetric cell performance is improved for both lanthanides at high temperatures. Among the cathode materials in this study, the highest catalytic activity for the ORR is achieved with Sr_2.7Ca_0.3Nd_0.3Fe_1.4Co_0.6O_7-δ + Gd_0.2Ce_0.8O_1.9 (GDC) composite cathode with an area specific resistance of 0.034 Ω cm² at 800 °C. Long-term thermal stability test shows that no impurity forms when Sr_2.7-xCa_xLn_0.3Fe_2-yCo_yO_7-δ oxides were heated at 800 °C for 150 h in air.

Ca和钴掺杂的在Ruddlesden的影响-波普系列氧化物的Sr的_2.7-X的Ca _X LN _0.3的Fe _2-Y钴_ý ö _7-δ其中x = 0和0.3，y = 0和0.6，Ln = La和Nd在电学和热学性能，固体氧化物燃料电池（SOFC）中的氧还原反应（ORR）的催化活性和相稳定性方面调查。共取代的样品在Ln = La和Nd时都显示出氧空位，电导率，热膨胀系数和电催化活性的增加。尽管在Sr位点掺杂Ca会稍微减少氧损失和热膨胀系数，但在高温下，两种镧系元素的对称电池性能都得到了改善。在这项研究的正极材料中，ORR的最高催化活性是通过Sr _2.7 Ca _0.3 Nd _0.3 Fe _1.4 Co _0.6实现的O7 _-δ  + Gd _0.2 Ce _0.8 O _1.9（GDC）复合阴极，在800°C下的面积比电阻为0.034Ωcm ²。长期热稳定性测试表明，将Sr _2.7-x Ca _x Ln _0.3 Fe _2-y Co _y O7 _-δ氧化物在空气中于800°C加热150 h后，没有杂质形成。