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Acta Phys. -Chim. Sin.  2016, Vol. 32 Issue (10): 2511-2517    DOI: 10.3866/PKU.WHXB201607131
ARTICLE     
Theoretical Study of the Interfacial Structure and Properties of a CdS/FeP Composite Photocatalyst
Zong-Yan ZHAO1,2,*(),Fan TIAN1
1 Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, P. R. China
2 Yunnan Key Laboratory of Micro/Nano Materials & Technology, School of Materials Science and Engineering, Yunnan University, Kunming 650504, P. R. China
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Abstract  

An effective method for improving the performance of a photocatalyst is to construct a suitable hetero-/homo-structure. This strategy can also lead to improvements in the stability of the photocatalysts that suffer with photo-corrosion (such as CdS). The preparation of CdS-based composite photocatalysts has therefore been widely studied. Unfortunately, however, some of the fundamental and more significant aspects of this strategy still need to be evaluated in greater detail. In this study, we have evaluated the interfacial microstructure and properties of a CdS/FeP composite photocatalyst with a hetero-structure using a series of the firstprinciples calculations. The results revealed that the electronic structure of the interface model exhibited different features compared with the bulk and surface models, because of the partially saturated dangling bonds. However, several obvious interfacial states were observed. At the interface of the CdS/FeP hetero-structure, the energy bands of CdS and FeP were relatively down-shifted, whereas the energy band of FeP was inserted below the conduction band of CdS. Furthermore, the direction of the built-in electric field of the hetero-structure projected out from the FeP layer towards the CdS layer under the equilibrium conditions. The photo-generated electron-hole pairs were therefore spatially separated by the CdS/FeP interface, which was favorable for improving the photocatalytic performance. The construction of a CdS/FeP hetero-structure can also lead to further improvements in the absorption properties of CdS in the visible-light region. The results of this study have provided mechanical explanations and theoretical support for the construction of highly efficient composite photocatalyst with hetero-structures.



Key wordsPhotocatalysis      Cadmium sulfide      Hetero-structure      Interfacial micro-structure      Interfacial property      Density functional theory calculation     
Received: 19 April 2016      Published: 13 July 2016
MSC2000:  O647  
Fund:  The project was supported by the National Natural Science Foundation of China(21473082);and 18th Yunnan Province Young Academic and Technical Leaders Reserve Talent Project(2015HB015)
Corresponding Authors: Zong-Yan ZHAO     E-mail: zzy@kmust.edu.cn
Cite this article:

Zong-Yan ZHAO,Fan TIAN. Theoretical Study of the Interfacial Structure and Properties of a CdS/FeP Composite Photocatalyst. Acta Phys. -Chim. Sin., 2016, 32(10): 2511-2517.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB201607131     OR     http://www.whxb.pku.edu.cn/Y2016/V32/I10/2511

 
Fig 2 Caculated total and partial density of states of (a) CdS and (b) FeP in different systems: bulk, surface, and interface
Fig 3 Caculated layer-resolution total density of states of CdS (a) and FeP (b) in the CdS/FeP model compared with the total density of states of bulk phase
Fig 4 Prposed energy band diagram of CdS/FeP hetero-structure
Fig 5 Caculated absorption spectra of CdS or FeP in different systems: bulk, surface, and interface
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