A general strategy for direct growth of yolk-shell MOF-on-MOF hybrids

[Display omitted] •An interfacial growth-reorganization strategy is developed.•General synthesis of yolk-shell MOF-on-MOF hybrids is achieved.•MOF derived carbon materials with bridged yolk-shell architecture is prepared.•Enhanced oxygen reduction reaction performance is achieved. Construction of me...

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Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2023-09, Vol.472, p.144926, Article 144926
Main Authors: Li, Jiaxin, Bao, Tong, Zhang, Chaoqi, Song, Hao, Zou, Yingying, Yuan, Ling, Xi, Yamin, Yu, Chengzhong, Liu, Chao
Format: Article
Language:English
Subjects:
Carbon
Interfacial growth
MOF-on-MOF
Oxygen reduction reaction
Yolk-shell
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Summary:[Display omitted] •An interfacial growth-reorganization strategy is developed.•General synthesis of yolk-shell MOF-on-MOF hybrids is achieved.•MOF derived carbon materials with bridged yolk-shell architecture is prepared.•Enhanced oxygen reduction reaction performance is achieved. Construction of metal–organic framework (MOF) hybrids with yolk-shell nanostructures via MOF-on-MOF growth is significant for MOF design toward elaborate properties and enhanced performances, while remains challenging. Here, we report the direct growth of yolk-shell MOF-on-MOF hybrids via an interfacial growth-reorganization strategy. The synthesis relies on the precise growth of guest CoZn-ZIF (ZIF = zeolite imidazole framework) with appropriate crystal diameter and arrangement on host MOFs, inducing an in-situ transformation of core–shell intermediate into yolk-shell product. This strategy can be generally applied to the growth of CoZn-ZIF onto various host MOFs with different shapes, crystal structures and compositions including rod-like and octahedral Fe-based NH2-MIL-88B (MIL = Material Institute Lavoisier) and cake-like Ti-based NH2-MIL-125 toward three kinds of yolk-shell MOF-on-MOF hybrids. Moreover, functional carbon materials with bridged yolk-shell architecture can be prepared by pyrolysis of MOF-on-MOF hybrids as precursors, exhibiting enhanced oxygen reduction reaction performance than their monomeric counterparts. Our work paves the way for the design and application of MOF based yolk-shell nanostructures.
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2023.144926