Direct Visualization of Atomic Structure in Multivariate Metal-Organic Frameworks (MOFs) for Guiding Electrocatalysts Design

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Dengrong Sun
  • Lok Wing Wong
  • Hok Yin Wong
  • Ka Hei Lai
  • Lin Ye
  • Xinyao Xv
  • Qingming Deng
  • Jiong Zhao

Detail(s)

Original languageEnglish
Journal / PublicationAngewandte Chemie (International Edition)
Online published18 Nov 2022
Publication statusOnline published - 18 Nov 2022

Abstract

The direct utilization of metal-organic frameworks (MOFs) for electrocatalytic oxygen evolution reaction (OER) has attracted increasing interests. Herein, we employ the low-dose integrated differential phase contrast-scanning transmission electron microscopy (iDPC-STEM) technique to visualize the atomic structure of multivariate MOFs (MTV-MOFs) for guiding the structural design of bulk MOFs for efficient OER. The iDPC-STEM images revealed that incorporating Fe3+ or ATA into Ni-BDC can introduce inhomogeneous lattice strain that weaken the coordination bonds, which can be selectively cleaved via a mild heat treatment to simultaneously generate coordinately unsaturated metal sites, conductive Ni@C and hierarchical porous structure. Thus, excellent OER activity with current densities of 10 and 100 mA cm-2 are achieved over the defective MOFs at small overpotentials of 286 mV and 365 mV, respectively, which is superior to the commercial RuO2 catalyst and most of the other MOFs.

Research Area(s)

  • metal-organic frameworks, iDPC-STEM, oxygen evolution reaction, multivariate MOFs, defect engineering

Citation Format(s)