Journal
ADVANCED ENERGY MATERIALS
Volume 9, Issue 13, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201803951
Keywords
charge modulation; charge separation; interface engineering; photocatalysis
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Funding
- National Natural Science Foundation of China [21761142018, 21673230]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDA21010207]
- Youth Innovation Promotion Association of Chinese Academy of Sciences
- RAMP
- D department of PetroChina
- Dalian Institute of Chemical Physics [DICPZZBS201610]
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Surface modulation via injection or extraction of charge carriers in microelectric devices has been used to tune the energy band alignment for desired electrical and optical properties, yet not well recognized in photocatalysis field. Here, taking semiconductor bismuth tantalum oxyhalides (Bi4TaO8X) as examples, chemically inactive molybdenum oxide (MoO3) with a large work function is introduced to qualitatively tune the properties of interfacial charges, achieving an evidently enhanced upward band bending and intensive built-in electric field. Such a simple charge modulation exhibits a remarkable improvement in photocatalytic water oxidation, reaching an apparent quantum efficiency of 25% at the input wavelength of 420 nm. The validity and generality of surface charge modulating strategy are further demonstrated using other semiconductors (e.g., C3N4) and decorators (e.g., V2O5). The findings not only provide a promising strategy for rationally manipulating the interfacial built-in electric field in photocatalysis but also pave the way to learn from microelectronic technologies to construct artificial photosynthesis systems for solar energy conversion.
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