【摘要】 采用溶胶-凝胶法制备出不同Fe掺杂量的LaCo_1-xFe_xO₃,并将其作为锌-空气电池的空气电极活性材料。分别通过XRD、SEM以及电化学测试研究了其形貌结构和电催化性能。结果表明，当Fe取代量超过50%时，LaCo_1-xFe_xO₃的晶体结构由菱面体开始转变为立方体。其中，LaCo_0.5Fe_0.5O₃颗粒均匀，晶粒尺寸达到纳米级别，在-0.7 V电位下，表现出了最大的极化电流密度4.92 mA·cm^-2。将LaCo_0.5Fe_0.5O₃应用于锌-空气电池空气电极中，在1mA恒定电流下，放电电压稳定在1.2 V。在80个循环后，充放电压差为0.85 V,往返效率保持在57.2%,优于LaCoO₃的0.95 V和52.0%。更多还原

【Abstract】 LaCo_1-xFe_xO₃ prepared by sol-gel method were used as air electrode active materials of zinc-air battery. The structure, morphology and electrocatalytic properties of LaCo_1-xFe_xO₃ were studied by XRD, SEM and electrochemical tests. The results showed that when the Fe substitution 50%, the crystal structure of LaCo_1-xFe_xO₃ change from rhombohedral to cubic. The LaCo_0.5Fe_0.5O₃ catalyst exhibited the maximum output current density of 4.92 mAcm² at the potential of-0.7 V（vs. Hg/HgO） and the grain size was in the nanometer level. The electrocatalytic property of LaCo_0.5Fe_0.5O₃ was evaluated as the air electrode catalyst for Zn-air battery. The discharge voltage was 1.2 V at the constant current of 1 mA. After 80 cycles, LaCo_0.5Fe_0.5O₃ showed a lower charge-discharge gap of 0.85 V with a higher round-trip efficiency of 57.3%, which was better than that of LaCoO₃（0.95 V and 52.0%）.更多还原