Hu Huicheng, Guan Wenhao, Xu Yafeng, Wang Xuchun, Wu Linzhong, Chen Min, Zhong Qixuan, Xu Yong, Li Youyong, Sham Tsun-Kong, Zhang Xiaohong, Wang Lu, Cao Muhan, Zhang Qiao
Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, No. 199 Ren'ai Road, Suzhou 215123, Jiangsu, People's Republic of China.
Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, Hubei, People's Republic of China.
ACS Nano. 2021 Aug 24;15(8):13129-13139. doi: 10.1021/acsnano.1c02515. Epub 2021 Aug 4.
Lead halide perovskite nanocrystals (CsPbX NCs) have been regarded as promising materials in photocatalysis. Combining metal single atoms with CsPbX 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 surface. Here, we demonstrate that Pt single atoms can be deposited on CsPbBr 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 NCs by inducing the generation of deep trap states in the band gap. The as-prepared Pt-SA/CsPbBr can be used as efficient and durable catalysts for photocatalytic semi-hydrogenation of propyne. A CsPbBr nanocrystal might be a suitable substrate for anchoring other metal single atoms, such as Cu, Au, Ag, Pd, and so on.
卤化铅钙钛矿纳米晶体（CsPbX NCs）被认为是光催化领域中很有前景的材料。将金属单原子与CsPbX NCs相结合可能是探索钙钛矿基催化剂的一种切实可行的方法。然而，这种杂化物尚未通过实验实现，主要是由于金属原子与CsPbX表面之间的相互作用较弱。在此，我们证明可以通过光辅助方法将Pt单原子沉积在CsPbBr NCs上，其中表面首先被部分氧化，然后通过形成Pt - O键和Pt - Br键来锚定Pt单原子。Pt单原子的沉积可以通过在带隙中诱导深陷阱态的产生来显著改变CsPbBr NCs的光物理性质。所制备的Pt - SA/CsPbBr可作为高效且耐用的催化剂用于丙炔的光催化半氢化反应。CsPbBr纳米晶体可能是锚定其他金属单原子（如Cu、Au、Ag、Pd等）的合适底物。
