Combining the catalytic activities of an oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) into one electrocatalyst is of great significance in simultaneously prompting the charge-discharge cycles of various renewable energy storage and conversion systems, such as metal-air batteries. Herein we report a ternary metallic-based MgNiO₂/CoNC porous hollow nanocage composite, which was assembled with intimate contacted MgNiO₂ and Co species to form ultrathin nanocage shells and serve as the ORR and OER active components, respectively, to produce a highly bi-functional catalytic performance. The possible synergy of each seamlessly connected metallic site renders the hybrid material with excellent ORR and OER activities, which outperform the corresponding benchmarks. Particularly, we speculate that such efficient catalytic activity might arise from the synergistic chemical coupling effects within MgNiO₂/CoNC and, therefore, these results reveal promising prospects in developing multi-metallic composites toward efficient electrochemical energy devices.

将氧还原反应（ORR）和氧释放反应（OER）的催化活性结合到一种电催化剂中，对于同时促进各种可再生能源存储和转换系统（例如金属-空气电池）的充放电循环具有重要意义。在本文中，我们报告了一种三元金属基MgNiO ₂ / CoNC多孔空心纳米笼式复合材料，该复合材料与紧密接触的MgNiO ₂组装在一起和Co物种形成超薄纳米笼壳，分别用作ORR和OER活性成分，以产生高度双功能的催化性能。每个无缝连接的金属位点可能产生的协同作用使混合材料具有出色的ORR和OER活性，其性能优于相应的基准。特别地，我们推测这种有效的催化活性可能来自MgNiO ₂ / CoNC内的协同化学偶联作用，因此，这些结果揭示了朝着有效的电化学能量装置开发多金属复合材料的有希望的前景。