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Issue 45, 2017
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Boosting molecular oxygen activation of SrTiO3 by engineering exposed facets for highly efficient photocatalytic oxidation

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Abstract

Engineering exposed facets for improving the activation of molecular oxygen into O2˙ species and charge separation is a promising way to improve photocatalytic oxidation activity. Herein, SrTiO3 nanocrystals with controllably exposed {001} and {110} facets are prepared as a proof-of-concept candidate to study the effect of exposed facets on the activation of molecular oxygen into O2˙ species, finally acting on the photocatalytic oxidation of gaseous HCHO. The photocatalytic test demonstrates that {110} facet exposed SrTiO3 nanoparticles present a HCHO photocatalytic degradation rate about 6.8 times faster than that of the {001} facet exposed one. The experiments and theoretical calculations together confirm that as compared to the {001} facet exposed sample, the {110} facet exposed sample is favorable for activating molecular oxygen to produce O2˙ species under the irradiation of light, owing to the relatively higher conduction band position and lower surface adsorption energy for O2 molecules as well as advantageous charge accumulation on adsorbed O2 molecules. Finally, the new production of O2˙ species and the higher charge separation contribute to the superior HCHO photocatalytic oxidation activity of {110} facet exposed SrTiO3. This interesting finding is probably useful for the design of highly efficient single crystal photocatalysts for photocatalytic oxidation reactions.

Graphical abstract: Boosting molecular oxygen activation of SrTiO3 by engineering exposed facets for highly efficient photocatalytic oxidation

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Publication details

The article was received on 13 Sep 2017, accepted on 24 Oct 2017 and first published on 25 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA08061A
Citation: J. Mater. Chem. A, 2017,5, 23822-23830
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    Boosting molecular oxygen activation of SrTiO3 by engineering exposed facets for highly efficient photocatalytic oxidation

    X. Wu, X. Wang, J. Li and G. Zhang, J. Mater. Chem. A, 2017, 5, 23822
    DOI: 10.1039/C7TA08061A

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