Structural evolution from a fence-like to pillared-layer metal-organic framework for the stable oxygen evolution...

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Metal-organic frameworks (MOFs) offer tunable structures for catalysis.
• Developing stable MOFs for demanding reactions like oxygen evolution reaction (OER) remains a challenge.
• Post-synthesis modification is a strategy to enhance MOF properties.

Purpose of the Study:

• To synthesize a stable pillared-layer MOF from an unstable fence-like MOF.
• To investigate the electrocatalytic activity and stability of the modified MOF for OER.
• To explore the effect of Fe doping on the MOF's OER performance.

Main Methods:

• Post-synthesis modification of an unstable MOF.
• Incorporation of iron (Fe) doping into the MOF structure.
• Electrochemical characterization, including oxygen evolution reaction (OER) measurements.
• Long-term stability testing of the electrocatalyst.

Main Results:

• Successfully synthesized a stable pillared-layer MOF via post-synthesis modification.
• The Fe-doped MOF achieved an ultralow overpotential of 238 mV at 10 mA cm⁻² for OER.
• Demonstrated superior electrocatalytic stability, with negligible performance decay over 168 hours.

Conclusions:

• Post-synthesis modification is an effective strategy to enhance MOF stability.
• The Fe-doped, stable MOF is a highly promising electrocatalyst for the oxygen evolution reaction.
• This work advances the development of robust materials for energy conversion applications.