Romani Lidia, Speltini Andrea, Ambrosio Francesco, Mosconi Edoardo, Profumo Antonella, Marelli Marcello, Margadonna Serena, Milella Antonella, Fracassi Francesco, Listorti Andrea, De Angelis Filippo, Malavasi Lorenzo
Department of Chemistry and INSTM, University of Pavia, Via Taramelli 16, 27100, Pavia, Italy.
Department of Drug Sciences, University of Pavia, Via Taramelli 12, 27100, Pavia, Italy.
Angew Chem Int Ed Engl. 2021 Feb 15;60(7):3611-3618. doi: 10.1002/anie.202007584. Epub 2020 Dec 14.
Water-stable metal halide perovskites could foster tremendous progresses in several research fields where their superior optical properties can make differences. In this work we report clear evidence of water stability in a lead-free metal halide perovskite, namely DMASnBr , obtained by means of diffraction, optical and X-ray photoelectron spectroscopy. Such unprecedented water-stability has been applied to promote photocatalysis in aqueous medium, in particular by devising a novel composite material by coupling DMASnBr to g-C N , taking advantage from the combination of their optimal photophysical properties. The prepared composites provide an impressive hydrogen evolution rate >1700 μmol g h generated by the synergistic activity of the two composite costituents. DFT calculations provide insight into this enhancement deriving it from the favorable alignment of interfacial energy levels of DMASnBr and g-C N . The demonstration of an efficient photocatalytic activity for a composite based on lead-free metal halide perovskite in water paves the way to a new class of light-driven catalysts working in aqueous environments.
水稳定的金属卤化物钙钛矿可以在几个研究领域取得巨大进展，在这些领域中，它们卓越的光学性质能够发挥作用。在这项工作中，我们通过衍射、光学和X射线光电子能谱报告了一种无铅金属卤化物钙钛矿（即DMASnBr₃）具有水稳定性的确切证据。这种前所未有的水稳定性已被用于促进水介质中的光催化作用，特别是通过将DMASnBr₃与g-C₃N₄耦合设计出一种新型复合材料，利用它们最佳光物理性质的组合。制备的复合材料由于两种复合成分的协同活性，提供了令人印象深刻的析氢速率>1700 μmol g⁻¹ h⁻¹。密度泛函理论（DFT）计算深入了解了这种增强作用，其源于DMASnBr₃和g-C₃N₄界面能级的有利排列。基于无铅金属卤化物钙钛矿的复合材料在水中具有高效光催化活性的证明为一类在水环境中工作的新型光驱动催化剂铺平了道路。
