Perovskite‐type oxides based on rare‐earth metals containing lanthanum manganate are promising catalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in alkaline electrolyte. Perovskite‐type LaMnO₃ shows excellent ORR performance, but poor OER activity. To improve the OER performance of LaMnO₃, the element cobalt is doped into perovskite‐type LaMnO₃ through a sol–gel method followed by a calcination process. To assess electrocatalytic activities for the ORR and OER, a series of LaMn_1−xCo_xO₃ (x=0, 0.05, 0.1, 0.2, 0.3, 0.4, and 0.5) perovskite oxides were synthesized. The results indicate that the amount of doped cobalt has a significant effect on the catalytic performance of LaMn_1−xCo_xO₃. If x=0.3, LaMn_0.7Co_0.3O₃ not only shows a tolerable electrocatalytic activity for the ORR, but also exhibits a great improvement (>200 mV) on the catalytic activity for the OER; this indicates that the doping of cobalt is an effective approach to improve the OER performance of LaMnO₃. Furthermore, the results demonstrate that LaMn_0.7Co_0.3O₃ is a promising cost‐effective bifunctional catalyst with high performance in the ORR and OER for application in hybrid Li−O₂ batteries.

中文翻译：

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钴掺杂钙钛矿型氧化物LaMnO3作为混合锂-氧电池的双功能氧催化剂

基于含锰酸镧的稀土金属的钙钛矿型氧化物是碱性电解质中氧还原反应（ORR）和氧释放反应（OER）的有前途的催化剂。钙钛矿型LaMnO ₃具有出色的ORR性能，但OER活性较差。为了提高LaMnO ₃的OER性能，可通过溶胶-凝胶法将元素钴掺入钙钛矿型LaMnO _3中，然后进行煅烧工艺。为了评估ORR和OER的电催化活性，需要一系列LaMn _{1- x} Co _x O ₃（x =合成了0、0.05、0.1、0.2、0.3、0.4和0.5）的钙钛矿氧化物。结果表明，钴的掺杂量对LaMn _{1- x} Co _x O ₃的催化性能具有显着影响。如果x ＝ 0.3，则LaMn _0.7 Co _0.3 O ₃不仅对ORR显示出可忍受的电催化活性，而且对OER的催化活性也显示出很大的改善（＞ 200mV）。这表明钴的掺杂是提高LaMnO ₃的OER性能的有效方法。此外，结果表明LaMn _0.7 Co _0.3 O ₃是一种有前景的具有成本效益的双功能催化剂，在ORR和OER中具有高性能，可用于混合Li-O ₂电池。