Charge Carrier Dynamics of CsPbBr 3 /g-C 3 N 4 Nanoheterostructures in Visible-Light-Driven CO 2 -to-CO Conversion.

Autor: Chen YH; School of Medicine, College of Medicine, National Cheng Kung University, Tainan 70101, Taiwan., Tsai KA; Department of Materials Science, National University of Tainan, Tainan 70005, Taiwan., Liu TW; Department of Materials Science, National University of Tainan, Tainan 70005, Taiwan., Chang YJ; Department of Materials Science, National University of Tainan, Tainan 70005, Taiwan., Wei YC; Department of Materials Science, National University of Tainan, Tainan 70005, Taiwan., Zheng MW; Department of Environmental Engineering, National Cheng Kung University, Tainan 70101, Taiwan., Liu SH; Department of Environmental Engineering, National Cheng Kung University, Tainan 70101, Taiwan., Liao MY; Department of Applied Chemistry, National Pingtung University, Pingtung City 900, Pingtung, Taiwan., Sie PY; Department of Applied Chemistry, National Pingtung University, Pingtung City 900, Pingtung, Taiwan., Lin JH; Department of Materials Science, National University of Tainan, Tainan 70005, Taiwan., Tseng SW; Core Facility Center, National Cheng Kung University, Tainan 70101, Taiwan., Pu YC; Department of Materials Science, National University of Tainan, Tainan 70005, Taiwan.
Jazyk: angličtina
Zdroj: The journal of physical chemistry letters [J Phys Chem Lett] 2023 Jan 12; Vol. 14 (1), pp. 122-131. Date of Electronic Publication: 2022 Dec 27.
DOI: 10.1021/acs.jpclett.2c03474
Abstrakt: The photon energy-dependent selectivity of photocatalytic CO 2 -to-CO conversion by CsPbBr 3 nanocrystals (NCs) and CsPbBr 3 /g-C 3 N 4 nanoheterostructures (NHSs) was demonstrated for the first time. The surficial capping ligands of CsPbBr 3 NCs would adsorb CO 2 , resulting in the carboxyl intermediate to process the CO 2 -to-CO conversion via carbene pathways. The type-II energy band structure at the heterojunction of CsPbBr 3 /g-C 3 N 4 NHSs would separate the charge carriers, promoting the efficiency in photocatalytic CO 2 -to-CO conversion. The electron consumption rate of CO 2 -to-CO conversion for CsPbBr 3 /g-C 3 N 4 NHSs was found to intensively depend on the rate constant of interfacial hole transfer from CsPbBr 3 to g-C 3 N 4 . An in situ transient absorption spectroscopy investigation revealed that the half-life time of photoexcited electrons in optimized CsPbBr 3 /g-C 3 N 4 NHS was extended two times more than that in the CsPbBr 3 NCs, resulting in the higher probability of charge carriers to carry out the CO 2 -to-CO conversion. The current work presents important and novel insights of semiconductor NHSs for solar energy-driven CO 2 conversion.
Databáze: MEDLINE
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