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题名: Synthesis of BaTaO2N oxynitride from Ba-rich oxide precursor for construction of visible-light-driven Z-scheme overall water splitting
作者: Dong, Beibei;  Qi, Yu;  Cui, Junyan;  Liu, Baodan;  Xiong, Fengqiang;  Jiang, Xin;  Li, Zheng;  Xiao, Yejun;  Zhang, Fuxiang;  Li, Can
发表日期: 2017-8-28
摘要: Barium tantalum oxynitride (BaTaO2N) with an absorption edge of ca. 660 nm is one of the most promising photocatalysts for solar water splitting, and is usually synthesized by nitriding a mixture of Ba and Tacontaining compounds with a Ba/Ta molar ratio of unity under ammonia flow at high temperature, usually causing a high density of defect sites. Herein, we introduce a novel synthesis method for BaTaO2N (BTON) by employing Ba-rich LiBa4Ta3O12, prepared by a flux method, as a precursor of nitridation. As a comparison, BaTaOx was prepared by conventional solid state reaction and used as the precursor. The as-nitrided samples were correspondingly denoted as BTON-Flux and BTON-SSR. It was 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 relative 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 H-2-evolving half reaction in the presence of methanol or Z-scheme overall water splitting, is much better than that of BTON-SSR. This study may open up a novel strategy for preparing oxynitride photocatalyst with decreased defect density for the promotion of solar water splitting.
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Recommended Citation:
Dong, Beibei,Qi, Yu,Cui, Junyan,et al. Synthesis Of Batao2n Oxynitride From Ba-rich Oxide Precursor For Construction Of Visible-light-driven Z-scheme Overall Water Splitting[J]. Royal Soc Chemistry,2017,46(32):10707-10713.

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