Synthesis, structure and photocatalytic activity of layered LaOInS2. Issue 27 (28th June 2017)

• Record Type: Journal Article
• Authors: Miura, Akira; Oshima, Takayoshi; Maeda, Kazuhiko; Mizuguchi, Yoshikazu; Moriyoshi, Chikako; Kuroiwa, Yoshihiro; Meng, Yu; Wen, Xiao-Dong; Nagao, Masanori; Higuchi, Mikio; Tadanaga, Kiyoharu
• Is Part Of: Journal of materials chemistry. Volume 5:Issue 27(2017)
• Page Start: 14270
• Page End: 14277
• Publication Date: 2017-06-28
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c7ta04440b
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : A layered oxysulfide, LaOInS2, which exhibits photocatalytic activity under visible light, was synthesized by the reaction of LaOCl and NaInS2 . 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. The InS6 octahedron had split 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 of ∼2.4 eV, which was close to the experimental value estimated by optical absorption (2.64 eV). Under visible light irradiation this visible-light absorption, LaOInS2 exhibited photocatalytic activity for H2 and O2 evolution from water with the aid of Pt and IrO2 cocatalysts, respectively.