Hydrogenation and disorder in engineered black TiO2

Lei Liu, Peter Y. Yu, Xiaobo Chen, Samuel S. Mao, D. Z. Shen

Research output: Contribution to journalArticlepeer-review

219 Scopus citations

Abstract

A new form of TiO2 which is black in color has been shown to exhibit high efficiency for photocatalytic reactions under solar radiation [X. Chen, L. Liu, P. Y. Yu, and S. S. Mao, Science 331, 746 (2011)SCIEAS0036-8075]. However, the mechanism behind this disorder-engineering process is not fully understood. In this Letter, based on density functional theory, we describe the role of hydrogen in producing lattice disorder in the anatase nanocrystals. We clarify further that the highly localized nature of the midgap states results in spatial separation of photoexcited electrons and holes in black TiO 2, and that accounts for its high photocatalytic efficiency.

Original languageBritish English
Article number065505
JournalPhysical Review Letters
Volume111
Issue number6
DOIs
StatePublished - 8 Aug 2013

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