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Heteroatom-Modulated Switching of Photocatalytic Hydrogen and Oxygen Evolution Preferences of Anatase TiO2 Microspheres

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Author(s)

Gang Liu, Jian Pan, Lichang Yin, John T. S. Irvine, Feng Li, Jun Tan, Philip Wormald, Hui-Ming Cheng

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Abstract

Understanding and manipulating the two half-reactions of photoinduced electron reduction and hole oxidation are key to designing and constructing efficient photocatalysts. Here, how the spatial distribution of the heteroatom modulates photocatalytic reduction (hydrogen evolution) and oxidation (oxygen evolution) reaction preferences is investigated by moving boron from the core to the shell of an anatase TiO2 microsphere along [001] via thermal diffusion control. The preference towards photocatalytic hydrogen and oxygen producing reactions from splitting water can be switched by creating a shell with an interstitial Bs+ (s = 3) gradient in the TiO2 microsphere. This switching stems from the downward shift of electronic band edges of the shell by a band bending effect that originates from the extra electrons coming from the interstitial Bs+. These results create new opportunities for designing and constructing efficient photocatalysts by spatial heteroatom engineering.

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Original languageEnglish
Pages (from-to)3233-3238
Number of pages6
JournalAdvanced Functional Materials
Volume22
Issue number15
Early online date23 Apr 2012
DOIs
Publication statusPublished - 7 Aug 2012

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