Crucial Role of Donor Density in the Performance of Oxynitride Perovskite LaTiO2N for Photocatalytic Water Oxidation

doi:10.1002/cssc.201601602

	Crucial Role of Donor Density in the Performance of Oxynitride Perovskite LaTiO2N for Photocatalytic Water Oxidation
	Yang, Minghui 2; Wan, Lipeng 2; DiSalvo, Francis J.3; Xiong, Feng-Qiang 2; Thomas, Tiju 1; Li, Yue 2
刊名	CHEMSUSCHEM
	2017-03-09
卷号	10 期号:5 页码:930-937
关键词	Ammonolysis Oxidation Oxynitrides Perovskite Phases Photocatalysis
ISSN号	1864-5631
DOI	10.1002/cssc.201601602
文献子类	Article
英文摘要	LaTiO2N photocatalysts were prepared by thermal ammonolysis of flux-synthesized La2Ti2O7 and La2TiO5, and were investigated for water oxidation. Though LaTiO2N derived from La2TiO5 appears defect-free by UV/Vis/near-IR and electron paramagnetic resonance (EPR) spectroscopy, its performance is much lower than that of conventional La2Ti2O7-derived LaTiO2N with defects. It is shown by Mott-Schottky analysis that La2TiO5-derived LaTiO2N has significantly lower donor density; this can result in insufficient built-in electric field for the separation of photogenerated electrons and holes. The lower donor density is also consistent with the smaller difference between the Fermi level and the valence-band maximum, which accounts for a lower oxidative power of the holes. In light of this discovery, the donor density was increased substantially by introducing anion vacancies through annealing in Ar. This resulted in improved performance. The CoOx-assisted La(2)TiO(5-)derived LaTiO2N annealed at 713 degrees C has a higher quantum efficiency (25%) at 450 nm than high-performance conventional CoOx/LaTiO2N (21%).
WOS关键词	VISIBLE-LIGHT-IRRADIATION ; CHLORIDE FLUX GROWTH ; HYDROGEN EVOLUTION ; NITRIDATION ; EFFICIENCY ; CRYSTALS ; KINETICS ; LAYER ; ESR ; NH3
WOS研究方向	Chemistry
语种	英语
出版者	WILEY-V C H VERLAG GMBH
WOS记录号	WOS:000398182300015
内容类型	期刊论文
源URL	[http://cas-ir.dicp.ac.cn/handle/321008/169330]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
通讯作者	Yang, Minghui; DiSalvo, Francis J.
作者单位	1.Indian Inst Technol, Dept Met & Mat Engn, Madras 600036, Tamil Nadu, India 2.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, Dalian 116023, Peoples R China 3.Cornell Univ, Dept Chem & Chem Biol, Ithaca, NY 14853 USA
推荐引用方式 GB/T 7714	Yang, Minghui,Wan, Lipeng,DiSalvo, Francis J.,et al. Crucial Role of Donor Density in the Performance of Oxynitride Perovskite LaTiO2N for Photocatalytic Water Oxidation[J]. CHEMSUSCHEM,2017,10(5):930-937.
APA	Yang, Minghui,Wan, Lipeng,DiSalvo, Francis J.,Xiong, Feng-Qiang,Thomas, Tiju,&Li, Yue.(2017).Crucial Role of Donor Density in the Performance of Oxynitride Perovskite LaTiO2N for Photocatalytic Water Oxidation.CHEMSUSCHEM,10(5),930-937.
MLA	Yang, Minghui,et al."Crucial Role of Donor Density in the Performance of Oxynitride Perovskite LaTiO2N for Photocatalytic Water Oxidation".CHEMSUSCHEM 10.5(2017):930-937.