Su Ke, Dong Guang-Xing, Zhang Wen, Liu Zhao-Lei, Zhang Min, Lu Tong-Bu
MOE International Joint Laboratory of Materials Microstructure, Institute for New Energy Materials and Low Carbon Technologies, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, P. R. China.
Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, P. R. China.
ACS Appl Mater Interfaces. 2020 Nov 11;12(45):50464-50471. doi: 10.1021/acsami.0c14826. Epub 2020 Oct 29.
The instability and low inferior catalytic activity of metal-halide perovskite nanocrystals are crucial issues for promoting their practical application in the photocatalytic field. Herein, we in situ coat a thin graphdiyne (GDY) layer on CsPbBr nanocrystals based on a facile microwave synthesis method, and employ it as a photocatalyst for CO reduction. Under the protection of GDY, the CsPbBr-based photocatalyst delivers significantly improved stability in a photocatalytic system containing water concomitant with enhanced CO uptake capacity. The favorable energy offset and close contact between CsPbBr and GDY trigger swift photogenerated electron transfer from CsPbBr to doping metal sites in GDY, boosting a remarkable improvement in the photocatalytic performance for CO reduction. Without adding traditional sacrificial reductants, the cobalt-doped photocatalyst achieves a high yield of 27.7 μmol g h for photocatalytic CO conversion to CO based on water as a desirable electron source, which is about 8 times higher than that of pristine CsPbBr nanocrystals.
金属卤化物钙钛矿纳米晶体的不稳定性和较低的催化活性是推动其在光催化领域实际应用的关键问题。在此，我们基于简便的微波合成方法，在CsPbBr纳米晶体上原位包覆一层薄的石墨炔（GDY）层，并将其用作光催化还原CO的光催化剂。在GDY的保护下，基于CsPbBr的光催化剂在含有水的光催化体系中稳定性显著提高，同时CO吸收能力增强。CsPbBr与GDY之间良好的能量偏移和紧密接触促使光生电子从CsPbBr迅速转移到GDY中的掺杂金属位点，从而显著提高了光催化还原CO的性能。在不添加传统牺牲还原剂的情况下，钴掺杂的光催化剂以水作为理想的电子源，实现了光催化CO转化为CO的高产率，即27.7 μmol g⁻¹ h⁻¹，这比原始CsPbBr纳米晶体高出约8倍。
