Construction of Single-Atom Platinum Catalysts Enabled by CsPbBr<sub>3</sub> Nanocrystals.
basic_science · Level V
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- Record sourced from PubMed, PMID 34346205.
- Also identified by DOI 10.1021/acsnano.1c02515.
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Abstract
Lead halide perovskite nanocrystals (CsPbX<sub>3</sub> NCs) have been regarded as promising materials in photocatalysis. Combining metal single atoms with CsPbX<sub>3</sub> NCs may be a practical way in exploring perovskite-based catalysts. However, such hybrids have not been achieved experimentally yet, mainly due to the weak interaction between the metal atom and the CsPbX<sub>3</sub> surface. Here, we demonstrate that Pt single atoms can be deposited on CsPbBr<sub>3</sub> NCs through a photoassisted approach, in which the surface was partially oxidized first, followed by the anchoring of Pt single atoms through the formation of Pt-O and Pt-Br bonds. The deposition of Pt single atoms can significantly change the photophysical properties of CsPbBr<sub>3</sub> NCs by inducing the generation of deep trap states in the band gap. The as-prepared Pt-SA/CsPbBr<sub>3</sub> can be used as efficient and durable catalysts for photocatalytic semi-hydrogenation of propyne. A CsPbBr<sub>3</sub> nanocrystal might be a suitable substrate for anchoring other metal single atoms, such as Cu, Au, Ag, Pd, and so on.