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Synthesis and Photocatalytic Activity of La 5 Ti 2 Cu(S 1− x Se x ) 5 O 7 Solid Solutions for H 2 Production under Visible Light Irradiation
Author(s) -
Nandy Swarnava,
Goto Yosuke,
Hisatomi Takashi,
Moriya Yosuke,
Minegishi Tsutomu,
Katayama Masao,
Domen Kazunari
Publication year - 2017
Publication title -
chemphotochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.13
H-Index - 18
ISSN - 2367-0932
DOI - 10.1002/cptc.201700005
Subject(s) - photocatalysis , absorption edge , visible spectrum , aqueous solution , materials science , solid solution , absorption (acoustics) , selenide , analytical chemistry (journal) , lattice constant , sulfide , chemistry , band gap , optics , physics , catalysis , optoelectronics , selenium , diffraction , biochemistry , chromatography , metallurgy , composite material
The effects of substituting selenide for sulfide ions in La 5 Ti 2 CuS 5 O 7 were studied, with the aim of developing visible‐light‐driven photocatalysts with longer absorption edge wavelengths. La 5 Ti 2 Cu(S 1− x Se x ) 5 O 7 (LTCS 1− x Se x O) solid solutions were obtained over the composition range of 0≤ x ≤1 by a solid‐state reaction, and their physical properties and photocatalytic activities during the H 2 evolution reaction in aqueous solutions were assessed. Structural refinements revealed that the lattice constants and cell volumes of the LTCS 1− x Se x O series follow Vegards’ law. With increases in the Se 2− content, the LTCS 1− x Se x O absorption edge shifts monotonically toward longer wavelengths, to a maximum of 820 nm for LTCSeO ( x= 1). Those materials for which x ≤0.8 generated H 2 from aqueous solutions containing Na 2 S and Na 2 SO 3 as electron donors under visible‐light irradiation ( λ >420 nm) after surface modification with in situ precipitated NiS. Comparatively higher H 2 evolution was observed for LTCS 1− x Se x O with lower Se 2− levels, although the sample for which x= 0.2 generated H 2 under visible light at wavelengths longer than 640 nm, whereas the LTCSO did not.