Hao Yaxin, Kang Yumao, Mi Yajun, Wang Wei, Lei Ziqiang
Key Laboratory of Eco-Environment-Related Polymer Materials, Ministry of Education of China, Key Laboratory of Gansu Polymer Materials, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, PR China.
School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou 730070, PR China.
J Colloid Interface Sci. 2021 Sep 15;598:83-92. doi: 10.1016/j.jcis.2021.03.142. Epub 2021 Mar 29.
Rational design of non-precious metal catalysts for efficient oxygen reduction and oxygen evolution reactions (ORR/OER) is important for rechargeable metal-air batteries. Building highly ordered porous structures while maintaining their overall crystalline orderliness is highly desirable, but remains an arduous challenge. Here, we have synthesized bimetallic metal-organic frameworks (MOFs) on highly ordered three-dimensional (3D) polystyrene templates by controlling the nucleation process. The ordered macropores with 190 nm diameters were uniformly distributed on the as-prepared ZnCo zeolitic imidazolate framework (ZnCo-ZIF). Afterwards, 3D ordered micro-meso-macroporous Co-N-doped carbon polyhedrons (3DOM Co-NCPs) was developed by calcination. With the synergy of the highly dispersed CoNC catalytic sites and the distinct porous structure, the synthesized 3DOM Co-NCPs exhibit impressive bifunctional activity. Additionally, the 3DOM Co-NCPs-900 for Zn-air battery exhibits extraordinary power density, high energy density, and acceptable stability. This approach offers a useful strategy for the fabrication of highly efficient electrocatalysts with 3D ordered porous.
合理设计用于高效氧还原和析氧反应（ORR/OER）的非贵金属催化剂对于可充电金属空气电池至关重要。在保持整体晶体有序性的同时构建高度有序的多孔结构是非常理想的，但仍然是一项艰巨的挑战。在此，我们通过控制成核过程，在高度有序的三维（3D）聚苯乙烯模板上合成了双金属金属有机框架（MOF）。直径为190 nm的有序大孔均匀分布在所制备的锌钴沸石咪唑酯框架（ZnCo-ZIF）上。之后，通过煅烧制备了三维有序微-介-大孔钴氮掺杂碳多面体（3DOM Co-NCPs）。由于高度分散的CoNC催化位点和独特的多孔结构的协同作用，合成的3DOM Co-NCPs表现出令人印象深刻的双功能活性。此外，用于锌空气电池的3DOM Co-NCPs-900表现出非凡的功率密度、高能量密度和可接受的稳定性。这种方法为制备具有三维有序多孔结构的高效电催化剂提供了一种有用的策略。
