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Solvent-Driven Precise Control of Stacking Configurations in Covalent Organic Frameworks for High-Efficiency

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Researchers developed a new method to control stacking in 2D COFs for better photocatalysis. The ABC-stacked COF-TD-ABC showed significantly higher hydrogen evolution rates than AA-stacked COF-TD-AA.

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Area of Science:

  • Materials Science
  • Catalysis
  • Nanotechnology

Background:

  • Two-dimensional covalent organic frameworks (2D COFs) show great potential as photocatalysts due to their large surface areas and tunable properties.
  • Controlling interlayer stacking in 2D COFs is crucial for optimizing charge transport and catalytic efficiency, but remains a significant challenge.

Purpose of the Study:

  • To develop a solvent-driven strategy for precise control over interlayer stacking configurations in metal-incorporated 2D COFs.
  • To investigate the impact of different stacking configurations (AA eclipsed vs. ABC staggered) on photocatalytic performance, specifically for hydrogen evolution.

Main Methods:

  • A solvent-driven strategy using 1-butanol was employed to modulate coordination interactions and achieve specific AA (COF-TD-AA) and ABC (COF-TD-ABC) stacking configurations in metal-incorporated 2D COFs.
  • Photocatalytic hydrogen evolution rates were measured for both COF-TD-AA and COF-TD-ABC, coupled with Pt co-catalysts.

Main Results:

  • The ABC-stacked COF-TD-ABC exhibited enhanced light absorption and superior charge migration/separation efficiency compared to COF-TD-AA.
  • COF-TD-ABC achieved a high hydrogen evolution rate of 10.92 mmol g⁻¹ h⁻¹, approximately 3.5 times greater than COF-TD-AA (3.12 mmol g⁻¹ h⁻¹).

Conclusions:

  • Precise control over interlayer stacking in 2D COFs significantly impacts their photocatalytic activity.
  • The developed solvent-driven strategy offers a pathway for designing high-performance COF-based photocatalysts by tuning stacking configurations for improved charge dynamics.