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Direct Z-Scheme Heterojunction of Semicoherent FAPbBr 3 /Bi 2 WO 6 Interface for Photoredox Reaction with Large Driving Force.
- Source :
-
ACS nano [ACS Nano] 2020 Dec 22; Vol. 14 (12), pp. 16689-16697. Date of Electronic Publication: 2020 Jul 01. - Publication Year :
- 2020
-
Abstract
- Metal halide perovskites with direct band gap and strong light absorption are promising materials for harvesting solar energy; however, their relatively narrow band gap limits their redox ability when used as a photocatalyst. Adding a second semiconductor component with the appropriate band structure offsets can generate a Z-scheme photocatalytic system, taking full advantage of the perovskite's intrinsic properties. In this work, we develop a direct Z-scheme photocatalyst based on formamidinium lead bromide and bismuth tungstate (FAPbBr <subscript>3</subscript> /Bi <subscript>2</subscript> WO <subscript>6</subscript> ) with strong redox ability for artificial solar-to-chemical energy conversion. With desirable band offsets and strong joint redox potential, the dual photocatalyst is shown to form a semicoherent heterointerface. Ultrafast transient infrared absorption studies employing selective excitation reveal synergetic photocarrier dynamics and demonstrate Z-scheme charge transfer mechanisms. Under simulated solar irradiation, a large driving force photoredox reaction (∼2.57 eV) of CO <subscript>2</subscript> reduction coupled with benzyl alcohol oxidation to benzaldehyde is achieved on the Z-scheme FAPbBr <subscript>3</subscript> /Bi <subscript>2</subscript> WO <subscript>6</subscript> photocatalyst, harnessing the full synergetic potential of the combined system.
Details
- Language :
- English
- ISSN :
- 1936-086X
- Volume :
- 14
- Issue :
- 12
- Database :
- MEDLINE
- Journal :
- ACS nano
- Publication Type :
- Academic Journal
- Accession number :
- 32573200
- Full Text :
- https://doi.org/10.1021/acsnano.0c03146