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Design of metal-organic frameworks (MOFs) with elobrate structural features is of great siginicance for their applications with improved performances. In this work, we report the construction of unique zinc-based zeolite imidazole framework (ZIF-8) microrings via an anisotropic growth-etching route. The synthesis relies on the anisotropic deposition of ZIF-8 crystals on the edge with coordinatively unsaturated Zn2+ of leaf-like ZIF (ZIF-L) nanosheets and subsequent selective etching of alkaline unstable ZIF-L. Furthermore, functional carbon materials with ring-like structure can be prepared by pyrolysis of ZIF-8 microrings as precursors, exhibiting enhanced oxygen reduction reaction performance than the traditional ZIF-8 derived counterparts. Our work may pave the way for the design of MOFs with sophisticated micro/nanostructures.
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