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 (FAPbBr3/Bi2WO6) 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 CO2 reduction
coupled with benzyl alcohol oxidation to benzaldehyde is achieved
on the Z-scheme FAPbBr3/Bi2WO6 photocatalyst,
harnessing the full synergetic potential of the combined system.
The photocatalytic hydrogen and oxygen evolution switching effect in the water splitting of two boron-doped anatase TiO2 microspheres was elucidated from the viewpoint of trap states.
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