Two-Dimensional Metal-Organic Framework Superstructures from Ice-Templated Self-Assembly

Yujie Song, Xiaokai Song*, Xiaoke Wang, Jingzheng Bai, Fang Cheng, Chao Lin, Xin Wang, Hui Zhang, Jianhua Sun, Tiejun Zhao, Hiroki Nara, Yoshiyuki Sugahara, Xiaopeng Li, Yusuke Yamauchi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Here, we report the synthesis of two-dimensional (2D) layered metal-organic framework (MOF) nanoparticle (NP) superstructures via an ice-templating strategy. MOF NP monolayers and bilayers can be obtained by regulating the concentration of colloidal MOF NPs without any external fields during self-assembly. Adjacent polyhedral MOF NPs are packed and aligned through crystalline facets, resulting in the formation of a quasi-ordered array superstructure. The morphology of the MOF layers is well preserved when subjected to pyrolysis, and the obtained carbon NPs have hollow interiors driven by the outward contraction of MOF precursors during pyrolysis. With the advantages of large surface areas, hierarchical porosity, high exposure of active sites, and fast electron transport of the 2D layered structure, the mono- and bilayered carbon NP superstructures show better oxygen reduction activity than isolated carbon particles in alkaline media. Our work demonstrates that ice-templating is a powerful strategy to fabricate superstructures of various MOFs and their derivatives.

Original languageEnglish
Pages (from-to)17457-17467
Number of pages11
JournalJournal of the American Chemical Society
Volume144
Issue number38
DOIs
Publication statusPublished - 2022 Sep 28

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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