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Density functional theory study of the interaction of H2 with pure and Ti-doped WO3 (002) surfaces |
Hu Ming(胡明)†, Wang Wei-Dan(王巍丹), Zeng Peng(曾鹏), Zeng Jing(曾晶), and Qin Yu-Xiang(秦玉香) |
School of Electronics and Information Engineering, Tianjin University, Tianjin 300072, China |
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Abstract Density functional theory (DFT) calculations are conducted to explore the interaction of H2 with pure and Ti-doped WO3 (002) surfaces. Four top adsorption models of H2 on pure and Ti-doped WO3 (002) surfaces are investigated respectively, they are adsorption on bridging oxygen O1c, absorption on plane oxygen O2c, absorption on 5-fold W5c (Ti), and absorption on 6-fold W6c. The most stable and H2 possible adsorption structure in the pure surface is H-end oriented to the surface plane oxygen O2c site, while the favourable adsorption sites for H2 in a Ti-doped surface is not only an O2c site but also a W6c site. The adsorption energy, the Fermi energy level EF, and the electronic population are investigated and the H2-sensing mechanism of a pure-doped WO3 (002) surface is revealed theoretically: the theoretical results are in good accordance with our existing experimental results. By comparing the above three terms, it is found that Ti doping can obviously enhance the adsorption of H2. It can be predicted that the method of Ti-doped into a WO3 thin film is an effective way to improve WO3 sensor sensitivity to H2 gas.
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Received: 07 October 2011
Revised: 23 October 2011
Accepted manuscript online:
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PACS:
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31.10.+z
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(Theory of electronic structure, electronic transitions, and chemical binding)
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21.60.De
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(Ab initio methods)
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21.60.Jz
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(Nuclear Density Functional Theory and extensions (includes Hartree-Fock and random-phase approximations))
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07.07.Df
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(Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing)
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 60771019 and 60801018), the Tianjin Key Research Program of Application Foundation and Advanced Technology, China (Grant No. 11JCZDJC15300), the Tianjin Natural Science Foundation, China (Grant No. 09JCYBJC01100), and the New Teacher Foundation of the Ministry of Education, China (Grant No. 200800561109). |
Corresponding Authors:
Hu Ming,huming@tju.edu.cn
E-mail: huming@tju.edu.cn
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Cite this article:
Hu Ming(胡明), Wang Wei-Dan(王巍丹), Zeng Peng(曾鹏), Zeng Jing(曾晶), and Qin Yu-Xiang(秦玉香) Density functional theory study of the interaction of H2 with pure and Ti-doped WO3 (002) surfaces 2012 Chin. Phys. B 21 023101
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