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Cobalt Amide Imidate Imidazolate Frameworks as Highly Active Oxygen Evolution Model Materials.

Alberto Bucci1, Suvendu Sekhar Mondal1, Vlad Martin-Diaconescu1

  • 1Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Avinguda Països Catalans, 16, 43007 Tarragona, Spain.

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Summary
This summary is machine-generated.

Two novel cobalt metal-organic frameworks (Co-MOFs), IFP-5 and IFP-8, were synthesized and tested for oxygen evolution reactions. IFP-8 demonstrated superior catalytic activity and stability, attributed to its unique nanostructure.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Metal-organic frameworks (MOFs) are promising materials for catalysis.
  • The oxygen evolution reaction (OER) is crucial for water splitting and renewable energy technologies.
  • Developing efficient and stable electrocatalysts for OER remains a significant challenge.

Purpose of the Study:

  • To synthesize and characterize two imidazolate-based cobalt-based metal-organic frameworks (Co-MOFs), IFP-5 and IFP-8.
  • To evaluate their catalytic performance for the oxygen evolution reaction (OER).
  • To investigate the structure-activity relationship and identify the active species responsible for OER.

Main Methods:

  • Solvothermal synthesis of Co-MOFs.
  • Electrochemical testing for OER, including overpotential measurements and stability tests.
  • Online gas chromatography for Faradaic efficiency determination.
  • Ex situ spectroscopic studies (PXRD, EXAFS, ATR) for structural and chemical analysis.

Main Results:

  • IFP-8 exhibited significantly lower overpotentials for OER compared to IFP-5.
  • High Faradaic efficiency (>99%) for O2 production was confirmed for IFP-8.
  • Exceptional stability of IFP-8 during 120 hours of OER and overall water splitting.
  • Spectroscopic studies identified the active species as a Co(O)OH phase with 3-10 nm particle size.

Conclusions:

  • The peripheral -R group in Co-MOFs critically influences their conversion to active species and catalytic performance.
  • IFP-8 is a highly active and stable electrocatalyst for OER, suitable for water splitting applications.
  • The formation of a nanostructured Co(O)OH phase is key to the superior activity of IFP-8.