Oxysulfide Semiconductors for Photocatalytic Overall Water Splitting with Visible Light

Photocatalytic overall water splitting by sulfide‐based materials is a great challenge because of the poor resilience of such materials against hole oxidation. In a recent study, Domen and co‐workers developed an innovative strategy to stabilize sulfide‐based photocatalysts by hybridizing S 3p with...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2019-10, Vol.58 (44), p.15580-15582
Main Authors: Zhang, Guigang, Wang, Xinchen
Format: Article
Language:English
Subjects:
Catalysts
charge separation
Charge transfer
Electronics industry
orbital hybridization
Oxidation
oxysulfides
Photocatalysis
photocatalyst durability
Photocatalysts
Splitting
Sulfide
Sulfides
surface engineering
Water splitting
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Summary:Photocatalytic overall water splitting by sulfide‐based materials is a great challenge because of the poor resilience of such materials against hole oxidation. In a recent study, Domen and co‐workers developed an innovative strategy to stabilize sulfide‐based photocatalysts by hybridizing S 3p with O 2p orbitals to produce oxysulfides in which S2− is stable. Further surface engineering of the oxysulfides with dual co‐catalysts promoted charge separation and interface transfer, thus reducing the charge build‐up that inhibits photocorrosion. The pH value of the reaction mixture is a critical consideration for achieving efficient stoichiometric H2 and O2 evolution by these oxysulfide photocatalysts. A Y2Ti2O5S2 oxysulfide photocatalyst that is activated and stabilized by Rh/Cr2O3 and IrO2 co‐catalysts achieves efficient photocatalytic overall water splitting when irradiated with 600 nm visible light. The band gap of Y2Ti2O5S2 is a narrow 1.9 eV because Y 3d contributes to the valence band maximum. This Highlight discusses this recent innovation in sulfide‐based photocatalytic materials. Key: conduction (CB) and valence (VB) bands, hydrogen (HEC) and oxygen (OEC) evolution co‐catalysts.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201909669