Abstract
The photon energy-dependent selectivity of photocatalytic CO2-to-CO conversion by CsPbBr3nanocrystals (NCs) and CsPbBr3/g-C3N4nanoheterostructures (NHSs) was demonstrated for the first time. The surficial capping ligands of CsPbBr3NCs would adsorb CO2, resulting in the carboxyl intermediate to process the CO2-to-CO conversion via carbene pathways. The type-II energy band structure at the heterojunction of CsPbBr3/g-C3N4NHSs would separate the charge carriers, promoting the efficiency in photocatalytic CO2-to-CO conversion. The electron consumption rate of CO2-to-CO conversion for CsPbBr3/g-C3N4NHSs was found to intensively depend on the rate constant of interfacial hole transfer from CsPbBr3to g-C3N4. An in situ transient absorption spectroscopy investigation revealed that the half-life time of photoexcited electrons in optimized CsPbBr3/g-C3N4NHS was extended two times more than that in the CsPbBr3NCs, resulting in the higher probability of charge carriers to carry out the CO2-to-CO conversion. The current work presents important and novel insights of semiconductor NHSs for solar energy-driven CO2conversion.
Original language | English |
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Pages (from-to) | 122-131 |
Number of pages | 10 |
Journal | Journal of Physical Chemistry Letters |
Volume | 14 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2023 Jan 12 |
All Science Journal Classification (ASJC) codes
- General Materials Science
- Physical and Theoretical Chemistry