Journal
CHEMSUSCHEM
Volume 13, Issue 24, Pages 6528-6533Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202002171
Keywords
hole transfer; metal sulfide; photocatalysis; water splitting; Z-scheme
Funding
- National Natural Science Foundation of China [51888103, 52076177]
- Shaanxi Technical Innovation Guidance Project [2018HJCG-14]
- Fundamental Research Funds for the Central Universities [xzy012019017]
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Developing efficient metal sulfides for pure water splitting is a challenging topic in the field of photocatalysis. Herein, inspired by natural photosynthesis, an all-solid-state Z-scheme photocatalyst was constructed with Cd0.9Zn0.1S (CZS) for water reduction, red phosphorus (RP) for water oxidation, and metallic CoP as the electron mediator. RP@CoP core-shell nanostructures were uniformly attached on the CZS nanorods, which gave rise to multiple monodispersed nanojunctions. The integrated Z-scheme nanosystem exhibited an apparent quantum efficiency of 6.4 % at 420 nm for pure water splitting. Theoretical analysis and femtosecond transient absorption results revealed that the impressive performance was mainly due to efficient hole transfer of CZS, resulting from the intimate atomic contacts between CoP mediator and photocatalysts, together with favorable band alignment. Meanwhile, the multiple monodispersed Z-scheme nanojunctions could provide abundant reaction sites, which was also important for the boosted activity.
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