An exceptionally stable octacobalt-cluster-based metal-organic framework for enhanced water oxidation catalysis

Area of Science:

• Materials Science
• Catalysis
• Electrochemistry
• Photochemistry

Background:

• Developing efficient and durable catalysts for water oxidation is crucial for energy applications.
• Existing catalysts often face challenges with stability and activity.

Purpose of the Study:

• To report a novel, highly stable metal-organic framework (MOF) with exceptional catalytic activity for water oxidation.
• To investigate the catalytic mechanism using computational and experimental methods.

Main Methods:

• Synthesis and characterization of a novel metal-organic framework.
• Electrically driven water oxidation measurements (overpotential, current density).
• Photodriven water oxidation measurements (turnover frequency, cycling stability).
• Computational simulations (e.g., DFT) and isotope tracing experiments.

Main Results:

• The MOF catalyst exhibits high activity and durability for both electrically driven (430 mV at 10 mA cm⁻²) and photodriven (16 s⁻¹, 12,000 cycles) water oxidation.
• The catalyst demonstrates the best performance reported to date for water oxidation.
• Computational and isotopic studies reveal the μ₄-OH group's role in forming an oxygen vacancy site with optimal hydroxide adsorption.

Conclusions:

• The developed MOF represents a significant advancement in water oxidation catalysis.
• The insights into the catalytic mechanism provide a foundation for designing future high-performance catalysts.
• This work paves the way for more efficient water splitting technologies.