Fabricating MAPbI3/MoS2 Composites for Improved Photocatalytic Performance

Although lead halide perovskites are demonstrated to be promising photocatalysts for hydrogen evolution from hydrogen halide splitting, it still remains challenging to fabricate efficient and stable catalysts. Here MoS2 nanoflowers with abundant active sites are assembled with methylammonium lead iodide (MAPbI(3)) microcrystals to form a new heterostructure. Its hydrogen evolution rate can reach up to about 30 000 mu mol g(-1) h(-1), which is more than 1000-fold higher than pristine MAPbI(3) under visible light irradiation (lambda >= 420 nm). Importantly, the solar HI splitting efficiency reaches 7.35%, one of the highest efficiencies so far. The introduction of MoS2 with proper band alignment and unsaturated species can efficiently promote the charge separation and afford more active sites for H-2 production. This finding not only provides a highly efficient and stable photocatalyst for hydrogen evolution but also offers a useful modification strategy on lead halide perovskites.

Automated summary

The study introduces a novel lead halide perovskite photocatalyst, which significantly enhances the hydrogen evolution rate by forming a new heterostructure with MoS2 nanoflowers. This photocatalyst is not only highly efficient and stable, but also exhibits a high solar HI splitting efficiency.