Efficient bifunctional electrocatalysts are in demand to increase kinetics of oxygen reduction and evolution reactions (ORR and OER) for rechargeable zinc–air batteries. In this work, dodecahedral MnCo₂O_4.5 hollowed‐out nanocages are synthesized using a seed‐mediated coordination chemistry of metal–organic frameworks. The hollowed‐out MnCo₂O_4.5 nanocages used as bifunctional oxygen electrocatalysts exhibit high catalytic activity and excellent stability for both ORR and OER in alkaline media, which can be attributed to both the hierarchical porosity and stable hollowed‐out structure that not only facilitate fast charge transfer reaction but also prevent the agglomeration of MnCo₂O_4.5 nanoparticles. The dodecahedral hollowed‐out MnCo₂O_4.5 nanocages as the air electrode catalyst can deliver good stability in a rechargeable zinc–air battery. Scanning electron microscopy and transmission electron microscopy images, X‐ray diffraction and X‐ray photoelectron spectroscopy of the electrocatalyst were measured again after durability tests. There is no significant influence on the morphologies, compositions, and structures before and after durability tests.

中文翻译：

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十二面体MnCo2O4.5空心纳米笼作为氧还原和释放的高效双功能电催化剂的合理设计

对于可充电锌空气电池，需要有效的双功能电催化剂来提高氧还原和析出反应（ORR和OER）的动力学。在这项工作中，使用金属-有机骨架的种子介导配位化学合成了十二面体的MnCo ₂ O _4.5空心纳米笼。用作双功能氧电催化剂的空心MnCo ₂ O _4.5纳米笼展示了高催化活性，并且在碱性介质中对ORR和OER均具有出色的稳定性，这可归因于分层孔隙率和稳定的空心结构，不仅促进了快速反应电荷转移反应还可以防止MnCo ₂ O _4.5的团聚纳米粒子。十二面体空心MnCo ₂ O _4.5纳米笼作为空气电极催化剂可在可充电锌空气电池中提供良好的稳定性。经过耐久性测试后，再次测量了电子催化剂的扫描电子显微镜和透射电子显微镜图像，X射线衍射和X射线光电子能谱。耐久性测试之前和之后，对形态，组成和结构没有重大影响。