Rechargeable aqueous Zn-ion batteries (ZIBs) and Zn–air batteries (ZABs) are emerging as possible alternatives to Li-based batteries due to their high safety, low cost, and environmental friendliness. The development of high-performance Zn-based energy storage devices requires highly durable, efficient, and earth-abundant cathode catalysts. We demonstrate the synthesis of a three-dimensional (3D) hybrid heterostructure based on MnO-Co and graphitic carbon and its bifunctional energy storage performance toward an ZIB and ZAB for the first time. The 3D nanoarchitecture of N-doped graphitic carbon (NC)-encapsulated MnO-Co heterostructure (MnO-Co@NC) supported on onion-like graphitic carbon (OLC) is obtained from a manganese- and cobalt-based multi-metal complex Mn₃[Co(CN)₆]₂. The NC outer shell is strongly coupled with the inner MnO-Co heterostructure and integrated with OLC. An ZIB device based on the MnO-Co@NC cathode delivers a specific capacity of 192.3 mAh g^–1 at a current density of 200 mA g^–1 and has excellent cycling stability of 450 cycles with 100% retention of the initial specific capacity at 2000 mA g^–1. The mechanism for Zn-ion storage is established. MnO-Co@NC also efficiently catalyzes the oxygen reduction reaction in an alkaline electrolyte and favors the 4e^– pathway desired for the fabrication of an ZAB. MnO-Co@NC serves as an efficient air cathode for the ZAB and it delivers a high peak power density and excellent rechargeability for >30 h with high efficiency. The encapsulating graphitic carbon network and OLC support afford excellent charge–discharge cycling stability to the devices.

中文翻译：

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三维氮掺杂石墨封装的MnO-Co异质结构：一种用于锌离子和锌空气电池的双功能储能材料

锂离子充电水基电池（ZIBs）和锌空气电池（ZABs）由于其高安全性，低成本和环境友好性而成为锂基电池的可能替代品。高性能锌基储能装置的发展需要高度耐用，高效且富含地球的阴极催化剂。我们首次展示了基于MnO-Co和石墨碳的三维（3D）杂化结构的合成及其对ZIB和ZAB的双功能储能性能。从锰和钴基多金属络合物Mn获得了3N纳米结构的N型掺杂石墨碳（NC）封装的MnO-Co异质结构（MnO-Co @ NC）负载在洋葱状石墨碳（OLC）上。₃ [Co（CN）₆ ] ₂。NC外壳与内部MnO-Co异质结构牢固结合，并与OLC集成在一起。基于MnO-Co @ NC阴极的ZIB设备在200 mA g ^–1的电流密度下可提供192.3 mAh g ^–1的比容量，并具有450个循环的出色循环稳定性，并在100％的初始比容量下保持2000 mA g ^–1。建立了锌离子存储的机制。的MnO钴@ NC也有效地催化在碱性电解质中的氧的还原反应与有利于4E ^-制造ZAB所需的途径。MnO-Co @ NC可以作为ZAB的有效空气阴极，并且在> 30 h的时间内提供高峰值功率密度和出色的充电性能。封装石墨碳网络和OLC支持为器件提供了出色的充放电循环稳定性。