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Defect management and efficient photocatalytic water oxidation reaction over Mg modified SrNbO2N
Sun, Xiaoqin1; Liu, Gang2; Xu, Xiaoxiang1
Corresponding AuthorXu, Xiaoxiang(xxxu@tongji.edu.cn)
2018-06-21
Source PublicationJOURNAL OF MATERIALS CHEMISTRY A
ISSN2050-7488
Volume6Issue:23Pages:10947-10957
AbstractAlthough 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.
Funding OrganizationYoung Scientists Fund of the National Natural Science Foundation of China ; Shanghai Science and Technology Commission ; Fundamental Research Funds for the Central Universities
DOI10.1039/c8ta00767e
Indexed BySCI
Language英语
Funding ProjectYoung 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 Research AreaChemistry ; Energy & Fuels ; Materials Science
WOS SubjectChemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary
WOS IDWOS:000439389100037
PublisherROYAL SOC CHEMISTRY
Citation statistics
Cited Times:22[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/133728
Collection中国科学院金属研究所
Corresponding AuthorXu, Xiaoxiang
Affiliation1.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
Recommended Citation
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.
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