Defect management and efficient photocatalytic water oxidation reaction over Mg modified SrNbO2N dagger

doi:10.1039/c8ta00767e

CORC > 金属研究所 > 中国科学院金属研究所

	Defect management and efficient photocatalytic water oxidation reaction over Mg modified SrNbO2N dagger
	Su, XQ ; Liu, G 1; Xu, XX
刊名	JOURNAL OF MATERIALS CHEMISTRY A
	2018-06-21
卷号	6 期号:23 页码:10947-10957
ISSN号	2050-7488
DOI	10.1039/c8ta00767e
英文摘要	Although SrNbO2N has a promising band gap of similar to 1.8 eV for solar water splitting, its photocatalytic activity is generally very poor under ordinary conditions, primarily due to high defect levels caused by synthetic procedures. In this work, we managed to control defect levels inside SrNbO2N by incorporating Mg into the structure, i.e. SrMgx/3Nb1-x/3O2+yN1-y (0 <= x <= 1). Strikingly, a number of important properties such as band gap value, defect level, nitrogen content and particle size can be tuned by varying the amounts of Mg in the structure. More importantly, efficient photocatalytic water oxidation into oxygen was realized using these Mg modified SrNbO2N. An apparent quantum efficiency (AQE) as high as 5.13% was reached at 420 +/- 20 nm for SrMg0.2Nb0.8O2+yN1-y (x = 0.6), which stands as the highest AQE reported to date for SrNbO2N. Mott-Schottky and X-ray photoelectron spectroscopy analyses revealed the shift of valence band maximum of SrNbO2N in response to Mg uptake. Moreover, open-circuit voltage decay measurements confirmed a much prolonged charge lifetime in Mg modified SrNbO2N. Thus, Mg serves not only to tailor band edge positions but also to ameliorate charge separation conditions in SrNbO2N, both of which contribute to the superior photocatalytic activities.
学科主题	Chemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary
语种	英语
WOS记录号	WOS:000439389100037
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/80150]
专题	金属研究所_中国科学院金属研究所
作者单位	1.Tongji Univ, Shanghai Key Lab Chem Assessment & Sustainabil, Sch Chem Sci & Engn, 1239 Siping Rd, Shanghai 200092, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Su, XQ,Liu, G,Xu, XX. Defect management and efficient photocatalytic water oxidation reaction over Mg modified SrNbO2N dagger[J]. JOURNAL OF MATERIALS CHEMISTRY A,2018,6(23):10947-10957.
APA	Su, XQ,Liu, G,&Xu, XX.(2018).Defect management and efficient photocatalytic water oxidation reaction over Mg modified SrNbO2N dagger.JOURNAL OF MATERIALS CHEMISTRY A,6(23),10947-10957.
MLA	Su, XQ,et al."Defect management and efficient photocatalytic water oxidation reaction over Mg modified SrNbO2N dagger".JOURNAL OF MATERIALS CHEMISTRY A 6.23(2018):10947-10957.