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

doi:10.1039/c8ta00767e

IMR OpenIR

	Defect management and efficient photocatalytic water oxidation reaction over Mg modified SrNbO2N
	Sun, Xiaoqin 1; Liu, Gang 2; Xu, Xiaoxiang 1
通讯作者	Xu, Xiaoxiang(xxxu@tongji.edu.cn)
	2018-06-21
发表期刊	JOURNAL OF MATERIALS CHEMISTRY A
ISSN	2050-7488
卷号	6 期号:23 页码:10947-10957
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.
资助者	Young Scientists Fund of the National Natural Science Foundation of China ; Shanghai Science and Technology Commission ; Fundamental Research Funds for the Central Universities
DOI	10.1039/c8ta00767e
收录类别	SCI
语种	英语
资助项目	Young Scientists Fund of the National Natural Science Foundation of China[21401142] ; Shanghai Science and Technology Commission[14DZ2261100] ; Fundamental Research Funds for the Central Universities
WOS研究方向	Chemistry ; Energy & Fuels ; Materials Science
WOS类目	Chemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary
WOS记录号	WOS:000439389100037
出版者	ROYAL SOC CHEMISTRY
引用统计	被引频次：40[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/133726
专题	中国科学院金属研究所
通讯作者	Xu, Xiaoxiang
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	Sun, Xiaoqin,Liu, Gang,Xu, Xiaoxiang. Defect management and efficient photocatalytic water oxidation reaction over Mg modified SrNbO2N[J]. JOURNAL OF MATERIALS CHEMISTRY A,2018,6(23):10947-10957.
APA	Sun, Xiaoqin,Liu, Gang,&Xu, Xiaoxiang.(2018).Defect management and efficient photocatalytic water oxidation reaction over Mg modified SrNbO2N.JOURNAL OF MATERIALS CHEMISTRY A,6(23),10947-10957.
MLA	Sun, Xiaoqin,et al."Defect management and efficient photocatalytic water oxidation reaction over Mg modified SrNbO2N".JOURNAL OF MATERIALS CHEMISTRY A 6.23(2018):10947-10957.