Enhancing Built-in Electric Fields for Efficient Photocatalytic Hydrogen Evolution by Encapsulating C₆₀ Fullerene...

Area of Science:

• Materials Science
• Chemistry
• Nanotechnology

Background:

• Metal-organic frameworks (MOFs) show promise as photocatalysts but suffer from inefficient charge separation and slow kinetics.
• Existing MOF photocatalysts often struggle to achieve high efficiency due to intrinsic limitations.

Purpose of the Study:

• To design and synthesize a novel MOF photocatalyst with enhanced charge separation and transfer properties.
• To investigate the impact of host-guest interactions on the built-in electric field and photocatalytic performance.

Main Methods:

• Encapsulation of C60 molecules within a nano-sized zirconium-based MOF (NU-901) to create C60@NU-901.
• Characterization of the electrostatic potential difference and built-in electric field in the composite material.
• Evaluation of photocatalytic hydrogen evolution activity.

Main Results:

• The C60@NU-901 composite exhibited a significantly enhanced built-in electric field (10.7 times higher than NU-901) due to host-guest interactions.
• Efficient separation and transport of photogenerated charge carriers were observed.
• Photocatalytic hydrogen evolution reached 22.3 mmol g⁻¹ h⁻¹, a high value for MOF-based systems.

Conclusions:

• Harnessing host-guest interactions in MOFs is a viable strategy to create strong built-in electric fields, promoting charge separation.
• The C60@NU-901 photocatalyst demonstrates superior performance for solar-to-chemical energy conversion.
• This approach offers a promising pathway for designing advanced MOF photocatalysts.