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Missing-linker metal-organic frameworks for oxygen evolution reaction.

Ziqian Xue1, Kang Liu2, Qinglin Liu1

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Incorporating missing linkers into metal-organic frameworks (MOFs) enhances their electrocatalytic properties. This strategy significantly improves the oxygen evolution reaction (OER) performance of MOFs, paving the way for advanced electrocatalyst development.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Metal-organic frameworks (MOFs) offer tunable structures for diverse applications.
  • Electrocatalytic properties of MOFs can be modified through structural engineering.

Purpose of the Study:

  • To investigate the impact of incorporating missing linkers on MOF electrocatalytic properties.
  • To enhance the oxygen evolution reaction (OER) performance of MOFs.

Main Methods:

  • Theoretical calculations to predict electronic structure modifications.
  • Synthesis of missing-linker MOFs using a layered-pillared Co2(OH)2(C8H4O4) (CoBDC) precursor.
  • Characterization using transmission electron microscopy (TEM) and synchrotron X-ray techniques.

Main Results:

  • Theoretical calculations confirmed electronic structure tuning via missing linkers.
  • Successful introduction and controlled incorporation of missing linkers into MOFs.
  • MOF nanoarrays with carboxyferrocene missing linkers achieved ultralow OER overpotential (241 mV at 100 mA cm⁻²).

Conclusions:

  • Introducing missing linkers is an effective strategy to enhance MOF electrocatalytic activity.
  • This approach offers a new pathway for designing efficient MOF-based electrocatalysts for OER.
  • The developed MOF nanoarrays demonstrate excellent potential for energy conversion applications.