Physicochemical properties and photocatalytic H2 evolution activity of Rh-doped La2Ti2O7 prepared by molten salt synthesis

Qian Wang; Takashi Hisatomi; Yosuke Moriya; Kazuhiko Maeda; Kazunari Domen

doi:10.1039/C3CY00179B

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Physicochemical properties and photocatalytic H₂ evolution activity of Rh-doped La₂Ti₂O₇ prepared by molten salt synthesis†

Qian Wang,^a Takashi Hisatomi,^a Yosuke Moriya,^a Kazuhiko Maeda^bc and Kazunari Domen*^a

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* Corresponding authors

^a Department of Chemical System Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan
E-mail: domen@chemsys.t.u-tokyo.ac.jp
Fax: +81-3-5841-8838
Tel: +81-3-5841-1148

^b Department of Chemistry, Faculty of Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, Japan

^c Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency (JST), 4-1-8 Honcho Kawaguchi, Saitama 332-0012, Japan

Abstract

La₂Ti₂O₇ doped with Rh showed photocatalytic activity for H₂ evolution from an aqueous methanol solution under visible light irradiation (λ > 420 nm). Molten salt synthesis yielded Rh-doped La₂Ti₂O₇ with a plate-like shape, and a higher crystallinity, phase purity, and visible light absorption capacity than is obtainable using solid state reaction and polymerized complex methods, owing to the photoexcitation of energy levels resulting from the Rh³⁺ doping. These factors led to an increased photocatalytic activity for H₂ evolution after modification with Pt cocatalysts. The effects of the conditions used during molten salt synthesis of Rh-doped La₂Ti₂O₇ on the resultant physical properties and photocatalytic activity are presented.

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Article information

DOI: https://doi.org/10.1039/C3CY00179B
Article type: Paper
Submitted: 18 Mar 2013
Accepted: 25 Apr 2013
First published: 26 Apr 2013

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Catal. Sci. Technol., 2013,3, 2098-2103

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Physicochemical properties and photocatalytic H₂ evolution activity of Rh-doped La₂Ti₂O₇ prepared by molten salt synthesis

Q. Wang, T. Hisatomi, Y. Moriya, K. Maeda and K. Domen, Catal. Sci. Technol., 2013, 3, 2098 DOI: 10.1039/C3CY00179B

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