d-NH₂-MIL-125 doped with Cu NPs for light-driven hydrogen evolution

Area of Science:

• Materials Science
• Photocatalysis
• Green Chemistry

Background:

• Metal-organic frameworks (MOFs) are promising materials for photocatalysis.
• Defect engineering in MOFs can enhance their catalytic performance.
• Improving electron-hole separation is crucial for efficient photocatalysis.

Purpose of the Study:

• To synthesize and characterize novel hybrid photocatalysts based on defect-engineered NH$_{2}$-MIL-125.
• To investigate the performance of these materials in hydrogen evolution and organic dehydrogenation reactions.
• To understand the role of copper nanoparticles in enhancing photocatalytic activity.

Main Methods:

• Defect creation on NH$_{2}$-MIL-125.
• Synthesis of copper-grafted NH$_{2}$-MIL-125 (Cu/d-NH$_{2}$-MIL-125) and copper nanoparticle-loaded d-NH$_{2}$-MIL-125 (CuNPs/d-NH$_{2}$-MIL-125) with varying copper content (1, 2, and 4 wt %).
• Evaluation of photocatalytic activity for hydrogen evolution reaction (HER) and dehydrogenation of tetrahydroisoquinoline.

Main Results:

• The optimal copper loading (2 wt %) resulted in high photocatalytic rates: 1326.55 μmol g$^{-1}$ h$^{-1}$ for HER and 427.15 μmol g$^{-1}$ h$^{-1}$ for tetrahydroisoquinoline dehydrogenation.
• The synthesized hybrid materials exhibited improved electron-hole separation efficiency.
• Defect engineering effectively enhanced the catalytic sites for grafted metals.

Conclusions:

• Defect-engineered NH$_{2}$-MIL-125 functionalized with copper nanoparticles serves as an efficient photocatalyst.
• The strategy of creating defects and grafting metals offers a new pathway for designing advanced MOF-based photocatalysts.
• This research contributes to the field of MOFs for photocatalytic applications, particularly in hydrogen production.