Here we report the synthesis of La and Ba substituted X_0.5Sr_0.5Co_0.8Mn_0.2O₃ using sol–gel auto-combustion method and their investigation as a low temperature solid oxide fuel cell. Structural investigations revealed that La_0.5Sr_0.5Co_0.8Mn_0.2O₃ (LSCM) crystallized out in rhombohedral perovskite structure while Ba_0.5Sr_0.5Co_0.8Mn_0.2O₃ (BSCM) has hexagonal perovskite structure. Morphological analysis confirmed the porous structure with uniform distribution of grains. However, agglomeration is decreased when La is replaced with Ba. The existence of all constituent elements as per their stochiometric ratio is evaluated through energy dispersive X-ray spectroscopy. Maximum conductivity value obtained at 600 °C for LSCM and BSCM is 3.51 Scm^-1 and 2.26 Scm^-1, respectively. In addition, the maximum values of current density and power density achieved by LSCM are 808 mAcm^-2 and 277 mWcm^-2 while that of BSCM are 663 mAcm^-2 and 186 mWcm^-2, respectively at low operating temperature of 600 °C. Furthermore, the open circuit voltage (V_OC) of LSCM and BSCM based fuel cells is 0.87 V and 0.72 V, respectively which indicates that there are minimal activation losses in the cells. These results showed that the fuel cell based on LSCM cathode has significantly higher values of power density and V_OC than that of BSCM based fuel cell. Therefore, LSCM based fuel cell are potential candidate for low temperature futuristic solid-state devices.

在这里，我们报告了使用溶胶-凝胶自燃法合成 La 和 Ba 取代的 X _0.5 Sr _0.5 Co _0.8 Mn _0.2 O _{3及其作为低温固体氧化物燃料电池的研究。}结构研究表明，La _0.5 Sr _0.5 Co _0.8 Mn _0.2 O ₃ (LSCM) 以菱面体钙钛矿结构结晶出来，而 Ba _0.5 Sr _0.5 Co _0.8 Mn _0.2 O ₃(BSCM) 具有六方钙钛矿结构。形态学分析证实了具有均匀分布的颗粒的多孔结构。然而，当 La 被 Ba 取代时，团聚减少。通过能量色散 X 射线光谱评估所有组成元素的存在，按照它们的化学计量比。LSCM 和 BSCM 在 600 °C 下获得的最大电导率值分别为 3.51 Scm ^-1和 2.26 Scm ^-1。此外，LSCM的电流密度和功率密度的最大值分别为808 mAcm ^-2和277 mWcm ^-2，而BSCM的最大值为663 mAcm ^-2和186 mWcm ^-2，分别在 600 °C 的低工作温度下。此外，基于 LSCM 和 BSCM 的燃料电池的开路电压 (V _OC ) 分别为 0.87  V 和 0.72  V，这表明电池中的激活损失最小。这些结果表明，基于 LSCM 阴极的燃料电池的功率密度和 V _OC值明显高于基于 BSCM 的燃料电池。因此，基于 LSCM 的燃料电池是低温未来固态设备的潜在候选者。