Charge Carrier Dynamics of CsPbBr3/g-C3N4Nanoheterostructures in Visible-Light-Driven CO2-to-CO Conversion

Yu Hung Chen, Kai An Tsai, Tzu Wei Liu, Yao Jen Chang, Yu Chen Wei, Meng Wei Zheng, Shou Heng Liu, Mei Yi Liao, Pei Yu Sie, Jarrn Horng Lin, Shih Wen Tseng, Ying Chih Pu

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

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 languageEnglish
Pages (from-to)122-131
Number of pages10
JournalJournal of Physical Chemistry Letters
Volume14
Issue number1
DOIs
Publication statusPublished - 2023 Jan 12

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Physical and Theoretical Chemistry

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