Constructing MIL-53(Fe)@ZIF-67(Co) binary metal-organic framework hierarchical heterostructure electrodes for...

Area of Science:

• Electrochemistry
• Materials Science
• Catalysis

Background:

• The oxygen evolution reaction (OER) is critical for addressing global energy and environmental challenges.
• Improving OER efficiency is essential for renewable energy technologies and reducing greenhouse gas emissions.

Purpose of the Study:

• To propose a preparation method for a MIL-53(Fe)@ZIF-67(Co) composite electrode.
• To investigate the OER performance and charge transfer mechanisms of the composite electrode.

Main Methods:

• Fabrication of a hierarchical MIL-53(Fe)@ZIF-67(Co) composite electrode.
• X-ray Photoelectron Spectroscopy (XPS) analysis.
• Density Functional Theory (DFT) calculations.

Main Results:

• The composite electrode exhibits a hierarchical structure facilitating electron and mass transport during OER.
• XPS and DFT confirmed electron transfer from Fe in MIL-53(Fe) to Co in ZIF-67(Co) via oxygen, indicating rapid charge transfer.
• The MIL-53(Fe)@ZIF-67(Co) electrode achieved an overpotential of only 193 mV at a current density of 10 mA cm⁻².

Conclusions:

• The MIL-53(Fe)@ZIF-67(Co) composite electrode demonstrates significant OER performance.
• This study presents a novel approach for designing multiphase interfaces and constructing MOF channel structures for enhanced catalysis.