Duan Xinde, Ge Fayuan, Yan Qi, Liu Yang, Zheng Hegen
State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, 210023, Nanjing, P. R. China.
Chemistry. 2024 Jan 8;30(2):e202302784. doi: 10.1002/chem.202302784. Epub 2023 Nov 14.
The production of metal-organic framework (MOF) nanoplates with well-defined geometric morphology is remarkable for expanding their applications. Herein, the cobalt-based MOF nanoplates with hexagonal channels from a layer-pillared MOF are accomplished, via a molecular scalpel strategy, utilizing monodentate pyridine to replace the bidentate 4,4'-bipyridine. The morphology can be modified from nanorods to nanoplates with controllable thickness tuned by the amounts of pyridine. Succeeding carbonization treatment transforms the MOF nanoplates into Co particles homogeneously encapsulated in the nitrogen-doped carbon layers. The prepared catalyst with a unique platelike morphology displays a high half-wave potential of 0.88 V in oxygen reduction reaction. When used in primary Zn-air batteries, it delivers a high peak power density of 280 mW cm . This work clarifies the structure-morphology-reactivity connection of MOF nanoplates.
制备具有明确几何形态的金属有机框架（MOF）纳米片对于拓展其应用具有重要意义。在此，通过分子手术刀策略，利用单齿吡啶取代双齿4,4'-联吡啶，成功制备出具有六边形通道的层柱状MOF钴基纳米片。通过吡啶用量可调控纳米片的厚度，从而将其形态从纳米棒转变为纳米片。后续的碳化处理将MOF纳米片转化为均匀包裹在氮掺杂碳层中的钴颗粒。所制备的具有独特片状形态的催化剂在氧还原反应中表现出0.88 V的高半波电位。当用于一次锌空气电池时，它可提供280 mW cm 的高峰值功率密度。这项工作阐明了MOF纳米片的结构 - 形态 - 反应活性之间的关系。
