To enhance the performance of an Ni-based cathode in a solid oxide electrolysis cell (SOEC) at medium temperature (600–800 °C), the present study adopted the method of adding Fe to Ni to fabricate Ni-Fe bimetal. Adding Fe can effectively inhibit Ni particles from becoming coarsen to enhance performance of Ni-based cathode. In the present study, the effects of different Fe contents in Ni_1-xFe_x (x = 0, 0.1, 0.2, 0.3, 0.4, 0.5) bimetallic materials on the performance of the Ni-based cathode for SOECs were systematically studied, and the optimal Fe content for Ni-Fe bimetallic materials suitable for use as the cathode of a SOEC was ascertained. The optimal Fe molar content is 40%. Under the open circuit voltage, the SDC-Ni_0.6Fe_0.4 based SOEC has a lower polarization impedance than other SOECs. Besides, at the same cell potential, the SDC-Ni_0.6Fe_0.4 based SOEC has a higher current than other SOECs. Furthermore, the SDC-Ni_0.6Fe_0.4 based SOEC exhibits good stability. Accordingly, this study proved that Ni-Fe bimetal with an appropriate proportion can enhance the performance of Ni-based cathode, and it was also demonstrated that at medium temperature, this material acts as an excellent cathode for a SOEC.

为了提高在中等温度（600–800°C）下固体氧化物电解槽（SOEC）中镍基阴极的性能，本研究采用了向镍中添加铁的方法来制造镍铁双金属。添加Fe可以有效地抑制Ni颗粒变粗大以增强Ni基阴极的性能。在本研究中，系统研究了Ni _1-x Fe _x（x = 0、0.1、0.2、0.3、0.4、0.5）双金属材料中不同Fe含量对SOECs镍基阴极性能的影响，并确定了适合用作SOEC阴极的Ni-Fe双金属材料的最佳Fe含量。Fe的最佳摩尔含量为40％。在开路电压下，SDC-Ni _0.6 Fe _0.4基于SOEC的SOEC具有比其他SOEC更低的极化阻抗。此外，在相同的电池电势下，基于SDC-Ni _0.6 Fe _0.4的SOEC具有比其他SOEC更高的电流。此外，基于SDC-Ni _0.6 Fe _0.4的SOEC表现出良好的稳定性。因此，该研究证明适当比例的Ni-Fe双金属可以增强Ni基阴极的性能，并且还证明了在中等温度下，该材料对于SOEC而言是极好的阴极。