Abstract
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 (Bi 4 TaO 8 X) as examples, chemically inactive molybdenum oxide (MoO 3 ) 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., C 3 N 4 ) and decorators (e.g., V 2 O 5 ). 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.
| Original language | English |
|---|---|
| Article number | 1803951 |
| Journal | Advanced Energy Materials |
| DOIs | |
| Publication status | Published - Jan 1 2019 |
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Keywords
- charge modulation
- charge separation
- interface engineering
- photocatalysis
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)
Cite this
Interfacial Charge Modulation : An Efficient Strategy for Boosting Spatial Charge Separation on Semiconductor Photocatalysts. / Tao, Xiaoping; Gao, Yuying; Wang, Shengyang; Wang, Xiaoyu; Liu, Yang; Zhao, Yue; Fan, Fengtao; Dupuis, Michel; Li, Rengui; Li, Can.
In: Advanced Energy Materials, 01.01.2019.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Interfacial Charge Modulation
T2 - An Efficient Strategy for Boosting Spatial Charge Separation on Semiconductor Photocatalysts
AU - Tao, Xiaoping
AU - Gao, Yuying
AU - Wang, Shengyang
AU - Wang, Xiaoyu
AU - Liu, Yang
AU - Zhao, Yue
AU - Fan, Fengtao
AU - Dupuis, Michel
AU - Li, Rengui
AU - Li, Can
PY - 2019/1/1
Y1 - 2019/1/1
N2 - 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 (Bi 4 TaO 8 X) as examples, chemically inactive molybdenum oxide (MoO 3 ) 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., C 3 N 4 ) and decorators (e.g., V 2 O 5 ). 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.
AB - 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 (Bi 4 TaO 8 X) as examples, chemically inactive molybdenum oxide (MoO 3 ) 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., C 3 N 4 ) and decorators (e.g., V 2 O 5 ). 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.
KW - charge modulation
KW - charge separation
KW - interface engineering
KW - photocatalysis
UR - http://www.scopus.com/inward/record.url?scp=85061564494&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85061564494&partnerID=8YFLogxK
U2 - 10.1002/aenm.201803951
DO - 10.1002/aenm.201803951
M3 - Article
AN - SCOPUS:85061564494
JO - Advanced Energy Materials
JF - Advanced Energy Materials
SN - 1614-6832
M1 - 1803951
ER -