MAPbI₃ microcrystals integrated with Ti₃C₂T MXene nanosheets for efficient visible-light photocatalytic H₂ evolution

Area of Science:

• Materials Science
• Photocatalysis
• Renewable Energy

Background:

• Metal halide perovskites, such as MAPbI3, are promising for photocatalysis but often suffer from low efficiency.
• MXene nanosheets, specifically Ti3C2Tx NSs, are emerging as efficient cocatalysts due to their unique electronic properties.

Purpose of the Study:

• To develop a novel composite photocatalyst by integrating Ti3C2Tx MXene nanosheets with MAPbI3 microcrystals.
• To evaluate the performance of the MAPbI3-Ti3C2Tx NS composite for visible-light-driven hydrogen evolution.
• To assess the stability and efficiency of the composite material over extended reaction times.

Main Methods:

• Synthesis of MAPbI3 microcrystals and Ti3C2Tx MXene nanosheets.
• Fabrication of MAPbI3-Ti3C2Tx NS composite photocatalysts.
• Photocatalytic hydrogen evolution experiments using MAPbI3-saturated HI aqueous solution under visible light irradiation.

Main Results:

• The MAPbI3-Ti3C2Tx NS composite demonstrated significantly enhanced H2 evolution rates compared to pristine MAPbI3.
• The optimal composite (100 mg MAPbI3-10 mg Ti3C2Tx NS) achieved a H2 evolution rate of 63.6 μmol h-1, 43 times higher than pristine MAPbI3.
• The composite exhibited stable H2 evolution activity over a 120-hour repeating reaction, indicating excellent durability.

Conclusions:

• Integrating Ti3C2Tx MXene nanosheets as a cocatalyst with MAPbI3 is a highly effective strategy for improving photocatalytic hydrogen production.
• The MAPbI3-Ti3C2Tx NS composite shows great potential for efficient and stable solar fuel generation.
• This work highlights the synergistic effects between perovskites and MXenes in advanced photocatalyst design.