钙钛矿相PbTiO3-CdS微米片复合光催化剂的制备及其分解水产氢性能研究
Study on the preparation of perovskite PbTiO3-CdS microplate composite photocatalysts and performance of their H2 generation via water splitting
叶宸硕 1许铭冬 1唐凌枫 1高文森 1朱敏 1尹思敏1
作者信息
- 1. 浙江理工大学机械工程学院,杭州 310018
- 折叠
摘要
为实现钙钛矿基半导体复合材料的高效光解水产氢,以钙钛矿相钛酸铅(PbTiO3,PTO)微米片为衬底,采用水热法制备钙钛矿相钛酸铅-硫化镉(PTO-CdS)微米片复合材料.探究水热温度和CdS负载量对复合材料的形貌及物相的影响;通过TEM、XPS及UV-Vis对复合材料的微结构、表面化学状态和光吸收特性进行表征;通过光解水产氢实验对复合材料的光催化活性进行测定和分析.结果表明:水热条件下,钙钛矿相PTO微米片对CdS的生长具有显著调控作用,与单独生长时尺寸约3μm的枝杈晶形貌不同,PTO-CdS微米片复合材料中的CdS为三角形纳米颗粒,尺寸约50 nm,均匀分散地生长在PTO微米片表面,且PTO与CdS之间界面清晰;水热温度和CdS负载量对复合材料的形貌和物相影响显著,水热温度为160 ℃、CdS负载量为6％时制备的PTO-CdS微米片复合材料尺寸均一,负载均匀,纯度和结晶度良好;PTO-CdS微米片复合材料在模拟太阳光下表现出光催化分解水产氢特性,其中PTO-CdS-6％的产氢速率达到141.45 μmol/h/g,是PTO微米片产氢效率的17倍,是CdS枝杈晶产氢效率的53倍.该研究为高效钙钛矿基半导体复合光催化剂的设计提供了思路.
Abstract
To achieve the efficient photolysis of H2 production from water,perovskite PTO-CdS microplate composites were successfully prepared by hydrothermal method with perovskite PbTiO3(PTO)microplates as substrates.The effects of the hydrothermal temperature and CdS loading capacity on the composites were investigated.The micro-structures,surface chemical states and light absorption properties of the composites were characterized by TEM,XPS and UV-Vis.The photocatalytic activity of the composites was determined and analyzed by photolytic H2 generation experiments via water splitting.The results showed that the growth of CdS under hydrothermal conditions was significantly regulated by perovskite-phase PTO microplates:unlike the branched crystals with a size of～3 μm,the prepared PTO-CdS composites had CdS as triangular nanoparticles with a size of～50 nm,which were uniformly dispersed on the surface of the PTO and there was a clear interface between PTO and CdS.The hydrothermal temperature and CdS loading capacity had significant effects on the morphology and phase of the composites,and the PTO-CdS microplate composites prepared under a hydrothermal temperature of 160 ℃ and a CdS loading capacity of 6％had a uniform size,uniform loading and satisfactory purity and crystallinity.PTO-CdS microplate composites exhibited photocatalytic H2 generation via water splitting under simulated sunlight.Specifically,PTO-CdS-6wt％microplate composites exhibited a H2 generation rate of 141.45 μmol/h/g under simulated solar light irradiation,which was～17 times and 53 times superior to that of pristine PTO microplates and CdS branched crystals,respectively.This study provides ideas for the design of efficient perovskite-based semiconductor composite photocatalysts.
关键词
钙钛矿相PbTiO3/CdS/光催化/水分解/产氢Key words
perovskite-phase PbTiO3/CdS/photocatalysis/water splitting/H2 generation引用本文复制引用
出版年
2024
NETL
NSTL
万方数据