La_0.5Ba_0.5Mn_1-xCo_xO_3-δ (x < 0.4) with a perovskite structure is studied as a cathode material for solid oxide electrolysis cells. The exsolution of metallic Co from the perovskite in a reducing atmosphere is in situ investigated. Co improves the electrical conductivity of La_0.5Ba_0.5MnO_3-δ in a reducing atmosphere, and facilitates the oxygen exchange reaction on the cathode surface. The cathode with in situ exsolved Co nanoparticles shows a high activity for both H₂O and CO₂ electrolysis. At 1.3 V, a single cell supported by a La_0.8Sr_0.2Ga_0.8Mg_0.2O_3-δ electrolyte layer achieves H₂O electrolysis current densities of 0.46 and 1.01 A cm^-2 at 700 and 800 °C, respectively. A high CO₂ electrolysis current density of 0.88 A cm^-2 is also obtained with the same cell at 1.2 V and 850 °C with a Faradaic efficiency exceeding 90%. The cathode exhibits a high stability for H₂O and CO₂ electrolysis. The co-electrolysis of H₂O and CO₂ with the cathode is also studied.

研究了具有钙钛矿结构的La _0.5 Ba _0.5 Mn _1-x Co _x O3 _-δ（x <0.4）作为固体氧化物电解槽的阴极材料。原位研究了还原性气氛中钙钛矿中金属钴的溶出。Co在还原性气氛中提高了La _0.5 Ba _0.5 MnO3 _-δ的电导率，并且促进了阴极表面上的氧交换反应。具有原位溶解的Co纳米颗粒的阴极对H ₂ O和CO ₂电解均显示高活性。在1.3 V电压下，由La _0.8 Sr _0.2支持的单个电池Ga _0.8 Mg _0.2 O3 _-δ电解质层在700和800°C时分别达到0.46和1.01 A cm ^-2的H ₂ O电解电流密度。同样的电池在1.2 V和850°C时也能获得0.88 A cm ^-2的高CO ₂电解电流密度，法拉第效率超过90％。阴极对于H ₂ O和CO ₂电解具有很高的稳定性。还研究了H ₂ O和CO ₂与阴极的共电解。