On the True Photoreactivity Order of {001}, {010}, and {101} Facets of Anatase TiO2 Crystals

Authors

  • Jian Pan,

    1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua RD, Shenyang 110016 (China)
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  • Dr. Gang Liu,

    Corresponding author
    1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua RD, Shenyang 110016 (China)
    • Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua RD, Shenyang 110016 (China)
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  • Prof. Gao Qing (Max) Lu,

    1. ARC Centre of Excellence for Functional Nanomaterials, The University of Queensland, Brisbane, Qld. 4072 (Australia)
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  • Prof. Hui-Ming Cheng

    Corresponding author
    1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua RD, Shenyang 110016 (China)
    • Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua RD, Shenyang 110016 (China)
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  • We thank Dr. C. H. Sun and Dr. Z. G. Chen for their generous help and valuable discussion regarding atomic structure models, Dr. D. M. Tang and Dr. P. F. Yan for their help in TEM characterization, the Major Basic Research Program, Ministry of Science and Technology of China (No. 2009CB220001), NSFC (Nos. 50921004, 51002160, and 21090343), Solar Energy Initiative, and the Funding (KJCX2-YW-H21-01) of the Chinese Academy of Sciences for financial support. GL thanks the IMR SYNL-T.S. Kê Research Fellowship.

Abstract

original image

Contrary to conventional understanding, clean anatase {001} facets exhibit lower photoreactivity than {101} facets. Furthermore, the {010} facets showed the highest photocatalytic reactivity in generating OH radicals and hydrogen evolution. This behavior was revealed by studies on crystals grown hydrothermally to have a predominance of {001}, {101}, or {010} facets (left to right in picture (a) and (b)–(d), respectively).

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