Chiu Ming-Huan, Yang Wein-Duo
Department of Chemical and Materials Engineering, National Kaohsiung University of Science and Technology, Kaohsiung 807, Taiwan.
Materials (Basel). 2024 Dec 24;18(1):5. doi: 10.3390/ma18010005.
This study employed a hydrothermal method to coat CuS onto PbS quantum dots loaded with ZnO, resulting in a core-shell-structured (PbS/ZnO)@CuS hetero-structured photocatalyst. The sulfide coating enhanced the photocatalyst's absorption in the near-infrared to visible light range and effectively reduced electron-hole (h) pair recombination during photocatalytic processes. Electron microscopy analysis confirmed the successful synthesis of this core-shell structure using polyvinylpyrrolidone (PVP); however, the spatial hindrance effect of PVP led to a disordered arrangement of the CuS lattice, facilitating electron-hole recombination. Comprehensive analyses using transmission electron microscopy (TEM), photoluminescence (PL), and Brunauer-Emmett-Teller (BET) methods revealed that the (PbS/ZnO)@CuS photocatalyst synthesized at a hydrothermal temperature of 170 °C exhibited optimal hydrogen production efficiency. After conducting a photocatalytic reaction for 5 h in a mixed aqueous solution containing 0.25 M NaS + NaSO as a sacrificial agent, a hydrogen production rate of 3473 μmol·g·h was achieved.
本研究采用水热法将硫化铜包覆在负载氧化锌的硫化铅量子点上，从而得到一种核壳结构的（硫化铅/氧化锌）@硫化铜异质结构光催化剂。硫化物包覆增强了光催化剂在近红外到可见光范围内的吸收，并有效减少了光催化过程中的电子 - 空穴对复合。电子显微镜分析证实了使用聚乙烯吡咯烷酮（PVP）成功合成了这种核壳结构；然而，PVP的空间位阻效应导致硫化铜晶格排列无序，促进了电子 - 空穴复合。使用透射电子显微镜（TEM）、光致发光（PL）和布鲁诺尔 - 埃米特 - 泰勒（BET）方法进行的综合分析表明，在170℃水热温度下合成的（硫化铅/氧化锌）@硫化铜光催化剂表现出最佳的产氢效率。在含有0.25M硫化钠 + 亚硫酸钠作为牺牲剂的混合水溶液中进行5小时光催化反应后，产氢速率达到3473μmol·g⁻¹·h⁻¹。
