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High-Throughput Electron Diffraction Reveals a Hidden Novel Metal-Organic Framework for Electrocatalysis.

Meng Ge1, Yanzhi Wang2, Francesco Carraro3

  • 1Department of Materials and Environmental Chemistry, Stockholm University, 10691, Stockholm, Sweden.

Angewandte Chemie (International Ed. in English)
|March 8, 2021
PubMed
Summary

A new metal-organic framework, ZIF-EC1, was discovered using 3D electron diffraction (3DED). This novel material shows promise as an electrocatalyst for oxygen reduction reactions (ORR).

Keywords:
continuous rotation electron diffractionelectrocatalysishigh throughput structural analysismetal-organic frameworksthree-dimensional electron diffraction

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Area of Science:

  • Materials Science
  • Crystallography
  • Electrochemistry

Background:

  • Metal-organic frameworks (MOFs) offer versatile applications due to their tunable structures.
  • Characterizing multiphasic MOF powders using X-ray diffraction is challenging.
  • Advanced structural characterization techniques are crucial for accelerating materials discovery.

Purpose of the Study:

  • To develop a high-throughput approach for MOF nano- and sub-microcrystal structural analysis.
  • To discover and characterize new MOF materials.
  • To evaluate the potential of a novel MOF as an electrocatalyst.

Main Methods:

  • High-throughput structural analysis using three-dimensional electron diffraction (3DED).
  • Structure solution and refinement of zeolitic-imidazolate frameworks (ZIFs).
  • Synthesis and characterization of N-doped carbon materials derived from MOFs.

Main Results:

  • A new ZIF, ZIF-EC1 (Zn3(mIm)5(OH)), was discovered and its structure solved using 3DED.
  • ZIF-EC1 possesses a dense 3D framework with high N and Zn densities.
  • N-doped carbon derived from ZIF-EC1 demonstrated efficacy as an oxygen reduction reaction (ORR) electrocatalyst.

Conclusions:

  • 3DED is a powerful technique for the structural analysis of MOF nano- and sub-microcrystals.
  • The discovery of ZIF-EC1 highlights the potential of 3DED in identifying novel materials.
  • ZIF-EC1-derived electrocatalysts show promise for applications in oxygen reduction reactions.