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Synthesis of BaTaO2N oxynitride from Ba-rich oxide precursor for construction of visible-light-driven Z-scheme overall water splitting

Abstract

Barium tantalum oxynitride (BaTaO2N) with absorption edge of ca. 660 nm is one of the most promising photocatalysts for solar water splitting, which was usually synthesized by nitriding mixture of Ba and Ta-containing compounds with Ba/Ta molar ratio of unity under ammonia flow at high temperature, as usually causes high density of defect sites. Here we will introduce a novel synthesis method of BaTaO2N (BTON) by employing Ba-rich LiBa4Ta3O12 as precursor of nitridation, which was prepared by a flux method. As a comparison, Ba2Ta2O7 was prepared by conventional solid state reaction and used as the precursor. The as-nitrided samples are correspondingly denoted as BTON-flux and BTON-SSR, respectively. It is found that well-crystallized BTON oxynitride can be similarly obtained by both methods, but the BTON-flux sample exhibits significantly decreased defect density and enhanced surface area with respect to the BTON-SSR sample. As a result of their structural differences, the photocatalytic water splitting performance of the BTON-flux sample regardless of the H2-evolving half reaction in the presence of methanol or Z-scheme overall water splitting is much better than that of BTON-SSR. This work may open up a novel strategy for preparing oxynitride photocatalyst with decreased defect density for promotion of solar water spitting.

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Publication details

The article was received on 09 Mar 2017, accepted on 19 May 2017 and first published on 19 May 2017


Article type: Paper
DOI: 10.1039/C7DT00854F
Citation: Dalton Trans., 2017, Accepted Manuscript
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    Synthesis of BaTaO2N oxynitride from Ba-rich oxide precursor for construction of visible-light-driven Z-scheme overall water splitting

    B. B. Dong, Y. Qi, J. Y. Cui, B. Liu, F. Xiong, X. Jiang, Z. Li, Y. Xiao, F. Zhang and C. Li, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT00854F

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