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Issue 25, 2014
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Gold photosensitized SrTiO3 for visible-light water oxidation induced by Au interband transitions

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Abstract

Gold nanoparticle (NP) photosensitization over semiconductors with a large band gap has emerged as a promising strategy for developing visible-light responsive photocatalytic materials. However, its application in harsh photocatalytic oxidation still remains a significant challenge. Furthermore, energetic charge carriers created in Au interband transitions under visible light are frequently ignored in this field. In the current work, for the first time, a remarkable visible-light photocatalytic water oxidation activity (14.9 μmol h−1: 0.2 g catalyst, 5 mmol AgNO3), even slightly higher than that of commercial WO3, was achieved over Au photosensitized SrTiO3 (1.1 wt%). In an elaborate study, electron transfer from gold to SrTiO3 was confirmed by STEM-EDS characterization on selective Ag deposition over SrTiO3. A combined investigation of apparent quantum efficiency results, theoretical simulation study on Au NPs optical excitation and relative band position analysis in Au/SrTiO3 reveals that these hot electrons transferred from gold to SrTiO3 mainly come from Au interband transitions other than plasmon resonance, while leaving holes on Au with enough oxidative potentials are responsible for water oxidation. The capability of involving Au interband transition in photosensitization for visible light water oxidation opens up new opportunities in designing and preparing visible-light responsive photocatalysts.

Graphical abstract: Gold photosensitized SrTiO3 for visible-light water oxidation induced by Au interband transitions

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Publication details

The article was received on 22 Apr 2014, accepted on 27 Apr 2014 and first published on 30 Apr 2014


Article type: Paper
DOI: 10.1039/C4TA01988A
Citation: J. Mater. Chem. A, 2014,2, 9875-9882
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    Gold photosensitized SrTiO3 for visible-light water oxidation induced by Au interband transitions

    L. Liu, P. Li, B. Adisak, S. Ouyang, N. Umezawa, J. Ye, R. Kodiyath, T. Tanabe, G. V. Ramesh, S. Ueda and H. Abe, J. Mater. Chem. A, 2014, 2, 9875
    DOI: 10.1039/C4TA01988A

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