Dynamic orbital hybridization triggered spin-disorder renormalization via super-exchange interaction for oxygen...

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• The oxygen evolution reaction (OER) is crucial for energy storage and conversion but is limited by slow kinetics and poor performance.
• Current strategies often focus on nanostructuring, but this work explores a novel dynamic orbital hybridization approach.

Purpose of the Study:

• To accelerate spin-dependent OER kinetics by renormalizing spin configuration in porous, noble-metal-free metal-organic frameworks (MOFs).
• To investigate the role of super-exchange interactions and dynamic magnetic ions in OER catalyst performance.

Main Methods:

• Utilizing an alternating electromagnetic field to stimulate dynamic magnetic ions in electrolytes, inducing super-exchange interaction.
• Reconfiguring spin nets within porous MOFs from a low-spin to a high-spin state.
• Analyzing the impact of spin renormalization on water dissociation and carrier migration.

Main Results:

• Spin-renormalized MOFs exhibited a mass activity of 2,095.1 A g_metal^-1 at an overpotential of 0.33 V.
• This performance is approximately 5.9 times higher than that of pristine MOFs.
• The study demonstrates a spin-dependent reaction pathway facilitated by ordered spin domains.

Conclusions:

• Dynamic orbital hybridization and spin renormalization offer a new strategy for designing efficient OER catalysts.
• Controlling spin configuration and domain direction is key to accelerating oxygen reaction kinetics.
• This research provides insights into spin-related catalysis for advanced energy technologies.