In situ fabrication of two-dimensional g-C3 N4 /Ba5 Ta4 O15 nanosheet heterostructures with efficient charge separations and photocatalytic hydrogen evolution under visible light illumination

Dalton Transactions : an International Journal of Inorganic Chemistry
Erbing HuaXiaoxiang Xu

Abstract

Separation of photo-generated electron-hole pairs plays a crucial role in determining the practical performance of semiconductor photocatalysts. Here we have successfully fabricated two dimensional g-C3N4/Ba5Ta4O15nanosheet heterostructures through an in situ urea degradation method. The so-formed nanosheet heterostructures demonstrate superior photocatalytic activities in H2evolution reactions over individual component. Further analysis using photoelectrochemical measurements suggests efficient charge separations at the interfaces of these heterostructures which contribute to a prolonged lifetime of photo-generated charges as well as the much enhanced photocatalytic activities. The in situ fabrication method adopted in this work ensures a firm anchorage of g-C3N4onto Ba5Ta4O15nanosheets and a face-to-face contact between these two semiconductors. Such a peculiar microstructure is critical to the high photocatalytic activity and apparently outweighs the conventional ones that involve only physical mixtures of two semiconductors and a point-to-point contact.

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Methods Mentioned

BETA
X-ray
irradiating
scanning electron microscopy
transmission electron microscopy
electron diffraction

Software Mentioned

JASCO

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