- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Urchin-like TiO2 structures decorated with lanthanide-doped Bi2S3 quantum dots to boost hydrogen photogeneration performance
摘要： The formation of heterojunctions between wide- and narrow-bandgap photocatalysts is commonly employed to boost the efficiency of photocatalytic hydrogen generation. Herein, the photoactivity of urchin-like rutile particles is increased by decorating with pristine as well as Er- or Yb-doped Bi2S3 quantum dots (QDs) at varied QD loadings (1–20 wt%) and doping degrees (1–15 mol%), and the best hydrogen evolution performance is achieved at Er and Yb contents of 10 mol%. Specifically, a hydrogen productivity of 1576.7 μmol?gcat?1 is achieved after 20-h irradiation for TiO2 decorated by 10 mol% Yb-doped Bi2S3 QDs. Theoretical calculations show that the introduction of defects into the Bi2S3 lattice through Er/Yb doping promotes the creation of the levels and facilitates transport of photogenerated charges during the photocatalytic process.
关键词： quantum dots,photocatalysis,TiO2,lanthanide doping,Bi2S3,hydrogen generation
更新于2025-09-23 15:21:01
-
Identification and optical features of the Pb4Ln2O7 series (Ln = La, Gd, Sm, Nd), genuine 2D-van der Waals oxides.
摘要： We report on the identification and survey of the Pb4Ln2O7 series (Ln= La, Gd, Sm and Nd) which turn out to be real Van der Waals 2D oxides. In the neutral layers, strong covalent Pb-O bonds together with external stereoactive Pb2+ lonepairs, which play as sensitizers, lead to an ideal matrix for enhanced and tunable luminescence by lantanide emittors, tested here for Sm3+ and Eu3+ doping. DFT calculations and preliminary exsolution experiments validate the weak bonding between the layers separated by 3.5 ? and suggest a undirect to direct crossover realized by isolating the layers.
关键词： lanthanide doping,luminescence,2D materials,Van der Waals oxides,DFT calculations
更新于2025-09-19 17:15:36