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Efficient Photocatalytic Oxygen Production over Nitrogen-Doped Sr4Nb2O9 under Visible-Light Irradiation
Wu, Fangfang; Lv, Meilin; Sun, Xiaoqin; Xie, Yinghao; Chen, Hongmei; Ni, Shuang; Liu, Gang; Xu, Xiaoxiang; xxxu@tongji.edu.cn
2016
Source PublicationCHEMCATCHEM
ISSN1867-3880
Volume8Issue:3Pages:615-623
AbstractPhotocatalytic water splitting is an appealing process for solar energy conversions yet it is often limited by the slow oxidation of water to oxygen half-reaction. Here we performed an investigation on N-doped Sr4Nb2O9 as a water oxidation photocatalyst. Our results show that N doping is an effective approach to improve the visible-light response of Sr4Nb2O9. Efficient photocatalytic oxygen production was observed after N doping, and the highest production rate of approximate to 27molh(-1) under visible-light irradiation corresponds to an apparent quantum efficiency of approximate to 0.31%. Clear anodic photocurrent can be generated under visible-light illumination, and the flat-band potential was determined to be approximate to-1.25V vs. Ag/AgCl at pH7. Theoretical calculations reveal that N doping introduces additional valence bands and is responsible for the visible-light response. Variations in light absorption and photo-oxidation performance can be controlled by modifying these valence band positions using different nitridation temperatures.
description.department[wu, fangfang ; lv, meilin ; sun, xiaoqin ; xie, yinghao ; chen, hongmei ; xu, xiaoxiang] tongji univ, dept chem, 1239 siping rd, shanghai 200092, peoples r china ; [ni, shuang] china acad engn phys, sci & technol plasma phys lab, laser fus res ctr, mianyang 621900, peoples r china ; [liu, gang] chinese acad sci, inst met res, 72 wenhua rd, shenyang 110016, peoples r china
KeywordDoping Oxygen Photochemistry Strontium Water Splitting
Funding OrganizationNational Natural Science Foundation of China [21401142]; Shanghai Science and Technology Commission [14DZ2261100]; Fundamental Research Funds for the Central Universities
Indexed Bysci
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/74802
Collection中国科学院金属研究所
Corresponding Authorxxxu@tongji.edu.cn
Recommended Citation
GB/T 7714
Wu, Fangfang,Lv, Meilin,Sun, Xiaoqin,et al. Efficient Photocatalytic Oxygen Production over Nitrogen-Doped Sr4Nb2O9 under Visible-Light Irradiation[J]. CHEMCATCHEM,2016,8(3):615-623.
APA Wu, Fangfang.,Lv, Meilin.,Sun, Xiaoqin.,Xie, Yinghao.,Chen, Hongmei.,...&xxxu@tongji.edu.cn.(2016).Efficient Photocatalytic Oxygen Production over Nitrogen-Doped Sr4Nb2O9 under Visible-Light Irradiation.CHEMCATCHEM,8(3),615-623.
MLA Wu, Fangfang,et al."Efficient Photocatalytic Oxygen Production over Nitrogen-Doped Sr4Nb2O9 under Visible-Light Irradiation".CHEMCATCHEM 8.3(2016):615-623.
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