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

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	Synthesis of BaTaO2N oxynitride from Ba-rich oxide precursor for construction of visible-light-driven Z-scheme overall water splitting
	Dong, Beibei; Qi, Yu; Cui, Junyan; Liu, Baodan; Xiong, Fengqiang; Jiang, Xin; Li, Zheng; Xiao, Yejun; Zhang, Fuxiang; Li, Can
刊名	ROYAL SOC CHEMISTRY
	2017-08-28
卷号	46 期号:32 页码:10707-10713
ISSN号	1477-9226
英文摘要	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.; 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.
学科主题	Chemistry, Inorganic & Nuclear
语种	英语
资助机构	Basic Research Program of China (973 Program) [2014CB239403]; National Natural Science Foundation of China [21633009, 21373210, 21522306]; "Hundred Talents Program" of Chinese Academy of Sciences
公开日期	2018-01-10
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79137]
专题	金属研究所_中国科学院金属研究所
通讯作者	Zhang, FX; Li, C (reprint author), Chinese Acad Sci, Dalian Natl Lab Clean Energy, State Key Lab Catalysis, iChEM,Dalian Inst Chem Phys, Dalian 116023, Peoples R China.
推荐引用方式 GB/T 7714	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.
APA	Dong, Beibei.,Qi, Yu.,Cui, Junyan.,Liu, Baodan.,Xiong, Fengqiang.,...&Li, C .(2017).Synthesis of BaTaO2N oxynitride from Ba-rich oxide precursor for construction of visible-light-driven Z-scheme overall water splitting.ROYAL SOC CHEMISTRY,46(32),10707-10713.
MLA	Dong, Beibei,et al."Synthesis of BaTaO2N oxynitride from Ba-rich oxide precursor for construction of visible-light-driven Z-scheme overall water splitting".ROYAL SOC CHEMISTRY 46.32(2017):10707-10713.