Graphene and MOF assembly: enhanced fabrication and functional derivative via MOF amorphisation

Zeheng Lin, Zhaojun Han, George E. P. O'Connell, Tao Wan, Ding Zhang, Zhipeng Ma, Dewei Chu, Xunyu Lu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The integration of graphene and metal–organic frameworks (MOFs) has numerous implications across various domains, but fabricating such assemblies is often complicated and time-consuming. Herein, a one-step preparation of graphene-MOF assembly is presented by directly impregnating vertical graphene (VG) arrays into the zeolitic imidazolate framework (ZIF) precursors under ambient conditions. This approach can effectively assemble multiple ZIFs, including ZIF-7, ZIF-8, and ZIF-67, resulting in their uniform dispersion on the VG with adjustable sizes and shapes. Hydrogen defects on the VG surface are critical in inducing such high-efficiency ZIF assembly, acting as the reactive sites to interact with the ZIF precursors and facilitate their crystallisation. The versatility of VG-ZIF-67 assembly is further demonstrated by exploring the process of MOF amorphization. Surprisingly, this process leads to an amorphous thin-film coating formed on VG (named VG-IL-amZIF-67), which preserves the short-range molecular bonds of crystalline ZIF-67 while sacrificing the long-range order. Such a unique film-on-graphene architecture maintains the essential characteristics and functionalities of ZIF-67 within a disordered arrangement, making it well-suited for electrocatalysis. In electrochemical oxygen reduction, VG-IL-amZIF-67 exhibits exceptional activity, selectivity, and stability to produce H 2O 2 in acid media.

Original languageEnglish
Article number2312797
Number of pages10
JournalAdvanced Materials
Early online date7 Feb 2024
DOIs
Publication statusE-pub ahead of print - 7 Feb 2024
Externally publishedYes

Keywords

  • electrocatalysis
  • graphene
  • graphene-MOF assembly
  • metal–organic frameworks (MOFs)
  • MOF amorphization

Fingerprint

Dive into the research topics of 'Graphene and MOF assembly: enhanced fabrication and functional derivative via MOF amorphisation'. Together they form a unique fingerprint.

Cite this