Self-Reconstructed Two-Dimensional Cluster-Based Co-Organic Layer Heterojunctions for Enhanced Oxygen Evolution...

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Efficient catalytic oxygen evolution reaction (OER) is vital for renewable energy and chemical production.
• Heterogeneous structures are key to overcoming limitations of single catalysts, improving activity and stability.
• Synthesizing complex heterogeneous crystalline materials remains a significant challenge.

Purpose of the Study:

• To investigate the dynamic structural changes of cobalt-metal-organic frameworks (Co-MOFs) in alkaline conditions.
• To develop a method for stably isolating self-reconfigured MOF heterogeneous materials.
• To create and evaluate a β-Co(OH)₂/Co-MOF heterojunction for enhanced OER performance.

Main Methods:

• In situ powder X-ray diffraction, FT-IR spectroscopy, and Raman spectroscopy were employed to capture dynamic structural changes.
• Self-reconfiguration of Co-MOFs in alkali was induced and monitored.
• The synthesized β-Co(OH)₂/Co-MOF heterojunction was characterized and tested for OER activity.

Main Results:

• The dynamic structural transformation of Co-MOFs in alkali was successfully captured and analyzed.
• Several self-reconfigured MOF heterogeneous materials with distinct structures were isolated.
• The β-Co(OH)₂/Co-MOF heterojunction demonstrated significantly enhanced OER activity, achieving a low overpotential of 333 mV at 10 mA cm^-2.
• The heterojunction structure facilitated rapid mass-charge transfer and exposed more active sites.

Conclusions:

• The study provides a novel approach to creating stable, self-reconfigured MOF heterogeneous materials.
• The developed β-Co(OH)₂/Co-MOF heterojunction shows great promise for efficient OER catalysis.
• These findings offer new insights for designing advanced cobalt-based MOFs for sustainable energy technologies.