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Researchers developed a new MOF-molecule catalyst by grafting platinum onto NH2-MIL-125. This enhances photocatalytic hydrogen production by optimizing electron transfer pathways and Pt single-atom coordination.

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Area of Science:

  • Materials Science
  • Catalysis
  • Nanotechnology

Background:

  • Metal-organic frameworks (MOFs) like NH2-MIL-125 are promising photocatalysts.
  • Efficient charge separation is crucial for improving photocatalytic activity.
  • Controlling the coordination environment of single-atom catalysts is key to tuning reactivity.

Purpose of the Study:

  • To develop a novel MOF-molecule hybrid catalyst for enhanced photocatalytic hydrogen evolution.
  • To investigate the effect of platinum single-atom coordination on catalytic performance.
  • To elucidate the mechanism of photoinduced charge migration.

Main Methods:

  • Post-modification of NH2-MIL-125 with Pt(bpy)Cl2 via amide reaction.
  • Further functionalization to precisely control Pt single-atom coordination (PtN2 and PtN4).
  • Characterization of material properties and photocatalytic hydrogen evolution activity measurement.

Main Results:

  • The Pt(bpy)Cl2 modification redirected charge migration to PtNx, enhancing electron transfer and separation.
  • The NML-PtN2 catalyst achieved a hydrogen evolution rate of 7.608 mmol g-1 h-1, significantly outperforming pristine MOF and NML-PtN4.
  • High apparent quantum yield (4.01%) and turnover frequency (190.3 h-1) demonstrate efficient solar energy utilization.

Conclusions:

  • Precisely regulating the Pt single-atom coordination sphere is critical for optimizing MOF-based photocatalysts.
  • The developed MOF-molecule catalyst offers a new strategy for efficient charge carrier separation.
  • This work provides profound insights for designing advanced single-atom catalysts for energy applications.