Fabricating MAPbI<sub>3</sub>/MoS<sub>2</sub> Composites for Improved Photocatalytic Performance.
basic_science · Level V
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- Record sourced from PubMed, PMID 33258607.
- Also identified by DOI 10.1021/acs.nanolett.0c04073.
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Abstract
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 MoS<sub>2</sub> nanoflowers with abundant active sites are assembled with methylammonium lead iodide (MAPbI<sub>3</sub>) microcrystals to form a new heterostructure. Its hydrogen evolution rate can reach up to about 30 000 μmol g<sup>-1</sup> h<sup>-1</sup>, which is more than 1000-fold higher than pristine MAPbI<sub>3</sub> under visible light irradiation (λ ≥ 420 nm). Importantly, the solar HI splitting efficiency reaches 7.35%, one of the highest efficiencies so far. The introduction of MoS<sub>2</sub> with proper band alignment and unsaturated species can efficiently promote the charge separation and afford more active sites for H<sub>2</sub> 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.