Metal–organic frameworks (MOFs) and MOF‐derived materials have recently attracted considerable interest as alternatives to noble‐metal electrocatalysts. Herein, the rational design and synthesis of a new class of Co@N‐C materials (C‐MOF‐C2‐T) from a pair of enantiotopic chiral 3D MOFs by pyrolysis at temperature T is reported. The newly developed C‐MOF‐C2‐900 with a unique 3D hierarchical rodlike structure, consisting of homogeneously distributed cobalt nanoparticles encapsulated by partially graphitized N‐doped carbon rings along the rod length, exhibits higher electrocatalytic activities for oxygen reduction and oxygen evolution reactions (ORR and OER) than that of commercial Pt/C and RuO₂, respectively. Primary Zn–air batteries based on C‐MOF‐900 for the oxygen reduction reaction (ORR) operated at a discharge potential of 1.30 V with a specific capacity of 741 mA h g_Zn^–1 under 10 mA cm^–2. Rechargeable Zn–air batteries based on C‐MOF‐C2‐900 as an ORR and OER bifunctional catalyst exhibit initial charge and discharge potentials at 1.81 and 1.28 V (2 mA cm^–2), along with an excellent cycling stability with no increase in polarization even after 120 h – outperform their counterparts based on noble‐metal‐based air electrodes. The resultant rechargeable Zn–air batteries are used to efficiently power electrochemical water‐splitting systems, demonstrating promising potential as integrated green energy systems for practical applications.

中文翻译：

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新型MOF衍生的Co @ N‐C双功能催化剂，用于高效的Zn-空气电池和水分解

作为贵金属电催化剂的替代品，金属有机框架（MOF）和MOF衍生的材料最近引起了广泛的关注。本文报道了通过在温度T下热解一对对映手性3D MOF合理设计和合成新型Co @ N‐C材料（C‐MOF‐C2-T）的方法。新开发的C‐MOF‐C2-900具有独特的3D分层棒状结构，由均匀分布的钴纳米颗粒组成，该纳米颗粒由沿棒长度的部分石墨化的N掺杂碳环包裹，具有更高的电催化活性，可进行氧还原和氧释放反应（ ORR和OER）超过了商用Pt / C和RuO ₂， 分别。基于C-MOF-900的用于氧气还原反应（ORR）的原锌空气电池在1.30 V的放电电位下工作，在10 mA cm ^–2下的比容量为741 mA hg _Zn ^–1。基于C-MOF-C2-900作为ORR和OER双功能催化剂的可再充电锌空气电池在1.81和1.28 V（2 mA cm ^–2）时表现出初始充电和放电电势，并具有出色的循环稳定性，而不会增加甚至在120 h后仍会发生极化-优于基于贵金属的空气电极。由此产生的可充电Zn-空气电池可用于为电化学水分解系统提供高效动力，证明了其在实际应用中作为集成绿色能源系统的潜力。