钙钛矿相PbTiO_(3)-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 Pb TOi_(3)-Cd Smicro plate composite photocatalysts and performance of their H_(2)generation via water splitting

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(PbTiO_(3),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141.45μmol/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。

To achieve the efficient photolysis of H_(2)production from water,perovskite PTO-CdS microplate composites were successfully prepared by hydrothermal method with perovskite PbTiO_(3)(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 H_(2)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~3μm,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 H_(2)generation via water splitting under simulated sunlight.Specifically,PTO-CdS-6wt%microplate composites exhibited a H_(2)generation rate of 141.45μmol/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.