A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Bi2Ti2O7 Quantum Dots for Efficient Photocatalytic Fixation of Nitrogen to Ammonia: Impacts of Shallow Energy Levels
https://orcid.org/0000-0002-3668-8551
AbstractPhotocatalytic fixation of nitrogen to ammonia represents an attractive alternative to the Haber–Bosch process under ambient conditions, and the performance can be enhanced by defect engineering of the photocatalysts, in particular, formation of shallow energy levels due to oxygen vacancies that can significantly facilitate the adsorption and activation of nitrogen. This calls for deliberate size engineering of the photocatalysts. In the present study, pyrochlore Bi2Ti2O7 quantum dots and (bulk‐like) nanosheets are prepared hydrothermally by using bismuth nitrate and titanium sulfate as the precursors. Despite a similar oxygen vacancy concentration, the quantum dots exhibit a drastically enhanced photocatalytic performance toward nitrogen fixation, at a rate of 332.03 µmol g−1 h−1, which is 77 times higher than that of the nanosheet counterpart. Spectroscopic and computational studies based on density functional theory calculations show that the shallow levels arising from oxygen vacancies in the Bi2Ti2O7 quantum dots, in conjunction with the moderately constrained quantum confinement effect, facilitate the chemical adsorption and activation of nitrogen.
Bi2Ti2O7 Quantum Dots for Efficient Photocatalytic Fixation of Nitrogen to Ammonia: Impacts of Shallow Energy Levels
https://orcid.org/0000-0002-3668-8551
AbstractPhotocatalytic fixation of nitrogen to ammonia represents an attractive alternative to the Haber–Bosch process under ambient conditions, and the performance can be enhanced by defect engineering of the photocatalysts, in particular, formation of shallow energy levels due to oxygen vacancies that can significantly facilitate the adsorption and activation of nitrogen. This calls for deliberate size engineering of the photocatalysts. In the present study, pyrochlore Bi2Ti2O7 quantum dots and (bulk‐like) nanosheets are prepared hydrothermally by using bismuth nitrate and titanium sulfate as the precursors. Despite a similar oxygen vacancy concentration, the quantum dots exhibit a drastically enhanced photocatalytic performance toward nitrogen fixation, at a rate of 332.03 µmol g−1 h−1, which is 77 times higher than that of the nanosheet counterpart. Spectroscopic and computational studies based on density functional theory calculations show that the shallow levels arising from oxygen vacancies in the Bi2Ti2O7 quantum dots, in conjunction with the moderately constrained quantum confinement effect, facilitate the chemical adsorption and activation of nitrogen.
Bi2Ti2O7 Quantum Dots for Efficient Photocatalytic Fixation of Nitrogen to Ammonia: Impacts of Shallow Energy Levels
https://orcid.org/0000-0002-3668-8551
AbstractPhotocatalytic fixation of nitrogen to ammonia represents an attractive alternative to the Haber–Bosch process under ambient conditions, and the performance can be enhanced by defect engineering of the photocatalysts, in particular, formation of shallow energy levels due to oxygen vacancies that can significantly facilitate the adsorption and activation of nitrogen. This calls for deliberate size engineering of the photocatalysts. In the present study, pyrochlore Bi2Ti2O7 quantum dots and (bulk‐like) nanosheets are prepared hydrothermally by using bismuth nitrate and titanium sulfate as the precursors. Despite a similar oxygen vacancy concentration, the quantum dots exhibit a drastically enhanced photocatalytic performance toward nitrogen fixation, at a rate of 332.03 µmol g−1 h−1, which is 77 times higher than that of the nanosheet counterpart. Spectroscopic and computational studies based on density functional theory calculations show that the shallow levels arising from oxygen vacancies in the Bi2Ti2O7 quantum dots, in conjunction with the moderately constrained quantum confinement effect, facilitate the chemical adsorption and activation of nitrogen.
Bi2Ti2O7 Quantum Dots for Efficient Photocatalytic Fixation of Nitrogen to Ammonia: Impacts of Shallow Energy Levels
Advanced Science
Li, Pengkun (author) / Wu, Runjie (author) / Li, Peishen (author) / Gao, Shuai (author) / Qin, Zeping (author) / Song, Xingjian (author) / Sun, Wenming (author) / Hua, Zhaorui (author) / Wang, Qiang (author) / Chen, Shaowei (author)
Advanced Science ; 11
2024-11-01
Article (Journal)
Electronic Resource
English
Construction of Bi2Ti2O7/Bi4Ti3O12 composites with enhanced visible light photocatalytic activity
| British Library Online Contents | 2017
A novel method for the preparation of Bi2Ti2O7 pyrochlore
| British Library Online Contents | 2012
La-substitution Bi2Ti2O7 thin films grown by chemical solution deposition
| British Library Online Contents | 2005
Preparation and properties of Bi2Ti2O7 thin films by chemical solution deposition
| British Library Online Contents | 2001