Mao Siman, Shi Jian-Wen, Sun Guotai, Zhang Yijun, Ma Dandan, Song Kunli, Lv Yixuan, Zhou Jun, Wang Hongkang, Cheng Yonghong
State Key Laboratory of Electrical Insulation and Power Equipment, Center of Nanomaterials for Renewable Energy, School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
Key Laboratory of Electronic Ceramics and Devices of Ministry of Education, Department of Electronics and Information, Xi'an Jiaotong University, Xi'an 710049, China.
ACS Appl Mater Interfaces. 2022 Nov 2;14(43):48770-48779. doi: 10.1021/acsami.2c15052. Epub 2022 Oct 19.
Herein, a new photocatalyst PdS@UiOS@CZS is successfully synthesized, where thiol-functionalized UiO-66 (UiOS), a metal-organic framework (MOF) material, is used as a host to encapsulate PdS quantum dots (QDs) in its cages, and CdZnS (CZS) solid solution nanoparticles (NPs) are anchored on its outer surface. The resultant PdS@UiOS@CZS with an optimal ratio between components displays an excellent photocatalytic H evolution rate of 46.1 mmol h g under visible light irradiation (420∼780 nm), which is 512.0, 9.2, and 5.9 times that of pure UiOS, CZS, and UiOS@CZS, respectively. The reason for the significantly enhanced performance is that the encapsulated PdS QDs strongly attract the photogenerated holes into the pores of UiOS, while the photogenerated electrons are effectively migrated to CZS due to the heterojunction effect, thereby effectively suppressing the recombination of charge carriers for further high-efficiency hydrogen production. This work provides an idea for developing efficient photocatalysts induced by hole attraction.
在此，成功合成了一种新型光催化剂PdS@UiOS@CZS，其中，金属有机框架（MOF）材料硫醇功能化的UiO-66（UiOS）用作主体，在其笼状结构中封装PdS量子点（QDs），并将CdZnS（CZS）固溶体纳米颗粒（NPs）锚定在其外表面。所得各组分比例最佳的PdS@UiOS@CZS在可见光照射（420∼780 nm）下表现出优异的光催化析氢速率，为46.1 mmol h g，分别是纯UiOS、CZS和UiOS@CZS的512.0倍、9.2倍和5.9倍。性能显著增强的原因是，封装的PdS量子点将光生空穴强烈吸引到UiOS的孔中，而由于异质结效应，光生电子有效地迁移到CZS，从而有效抑制了电荷载流子的复合，以进一步实现高效产氢。这项工作为开发由空穴吸引诱导的高效光催化剂提供了思路。
