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Synthesis, Structure and Photocatalytic Activity of Layered LaOInS2

Abstract

Indium oxychalcogenides would be attractive semiconductors considering the practical use of indium oxides and sulfides such as indium-tin oxides (ITO) and copper-indium-gallium diselenides (CIGS). In this work, a novel layered indium oxysulfide, LaOInS2, was synthesized by a metathesis reaction between LaOCl and NaInS2. Synchrotron X-ray diffraction showed that LaOInS2 consisted of alternately stacked rocksalt-type In–S and PbO-type La–O layers. InS6 octahedron had splitting In sites with abnormally large anisotropic atomic displacement factors. LaOInS2 was found to be a direct semiconductor. Density functional theory calculations exhibited well-dispersed bands composed of In 5s/5p and S 3p/O 2p orbitals with a band gap and an onset of optical absorption of ~2.5 eV, which was close to the experimental value estimated by optical absorption (2.64 eV). By responding this visible-light absorption, LaOInS2 exhibited photocatalytic activity for H2 and O2 evolution from water with the aid of Pt and IrO2 cocatalysts, respectively

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Publication details

The article was received on 22 May 2017, accepted on 08 Jun 2017 and first published on 09 Jun 2017


Article type: Paper
DOI: 10.1039/C7TA04440B
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Synthesis, Structure and Photocatalytic Activity of Layered LaOInS2

    A. Miura, T. Oshima, K. Maeda, Y. Mizuguchi, C. Moriyoshi, Y. KUROIWA, Y. Meng, X. Wen, M. Nagao, M. Higuchi and K. Tadanaga, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA04440B

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