Issue 15, 2014
From the journal:

Physical Chemistry Chemical Physics

Active hydrogen species on TiO2 for photocatalytic H2 production†

Zongfang Wu,‡a   Wenhua Zhang,‡b   Feng Xiong,a   Qing Yuan,a   Yuekang Jin,a   Jinlong Yanga  and  Weixin Huang*ab  

* Corresponding authors

a Hefei National Laboratory for Physical Sciences at Microscale, Suzhou Nano Tech Co-innovation Center and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
E-mail: huangwx@ustc.edu.cn

b CAS Key Laboratory of Materials for Energy Conversion and Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China

Abstract

Photocatalytic H2 production over TiO2 has attracted tremendous attention and achieved great progress, but the active hydrogen species is still unknown. Employing a rutile TiO2(110) surface as a model catalyst we report here for the first time the direct observation of photocatalytic H2 production under ultrahigh vacuum conditions during UV-light irradiation at 115 K and the identification of negatively-charged hydride-type H-Ti species as the corresponding photoactive surface species by means of thermal desorption spectroscopy, photon-stimulated desorption spectroscopy, X-ray photoelectron spectroscopy and DFT calculations. The formation and stability of H-Ti species are closely related to available surplus electrons on the rutile TiO2(110) surface that can be created by the formation of surface BBO vacancies or by the formation of surface hydroxyls via the adsorption of atomic H or molecular H2 on O sites. The photocatalytic H2 production from H-Ti species is hole-mediated and co-existing water exerts a negative effect on this process.

Graphical abstract: Active hydrogen species on TiO2 for photocatalytic H2 production

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Article information

DOI
https://doi.org/10.1039/C4CP00697F
Article type
Paper
Submitted
17 Feb 2014
Accepted
19 Feb 2014
First published
20 Feb 2014

Phys. Chem. Chem. Phys., 2014,16, 7051-7057

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Active hydrogen species on TiO2 for photocatalytic H2 production

Z. Wu, W. Zhang, F. Xiong, Q. Yuan, Y. Jin, J. Yang and W. Huang, Phys. Chem. Chem. Phys., 2014, 16, 7051 DOI: 10.1039/C4CP00697F

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