Effective photocatalytic H2O2 production under visible light irradiation at g-C3N4 modulated by carbon vacancies
Li, SN (Li, Shuna); Dong, GH (Dong, Guohui); Hailili, R (Hailili, Reshalaiti); Yang, LP (Yang, Liping); Li, YX (Li, Yingxuan); Wang, F (Wang, Fu); Zeng, YB (Zeng, Yubin); Wang, CY (Wang, Chuanyi)
2016
Source PublicationAPPLIED CATALYSIS B-ENVIRONMENTAL
Volume190Issue:8Pages:26-35
AbstractHydrogen peroxide (H2O2) is of great significance in biological and environmental processes as well as in chemical industry. Even though anthraquinone autoxidation (AO) process has been the major artificial way to produce H2O2, its energy cost and non-green nature have been motivating people to develop more efficient, economic and green technologies as alternatives. Here we demonstrated that photocatalytic H2O2 production at g-C3N4 could be improved by as much as 14 times in the absence of organic scavenger through a carbon vacancy-based strategy. Both the experimental and theoretical calculation results indicated that the creation of carbon vacancies could reduce the symmetry of g-C3N4 and produce the effect of electron delocalization. This will allow g-C3N4 to possess more excitable electrons and a narrower band gap. On the other hand, carbon vacancies provided more sites to adsorb molecular oxygen and thereby help electrons transfer from g-C3N4 to the surface adsorbed O-2. More interestingly, the presence of carbon vacancies changed the H2O2 generation pathway from a two-step single-electron indirect reduction to an one-step two-electron direct reduction. This study could not only develop a novel strategy to improve the H2O2 production activity of semiconductors, but also shed light on the deep understanding of the role played by surface defect structure on photocatalytic activity of semiconductor photocatalysts.
KeywordPhotocatalysis Hydrogen Peroxide Carbon Vacancy G-c3n4 Oxygen Reduction
DOI10.1016/j.apcatb.2016.03.004
Indexed BySCI
WOS IDWOS:000374604900003
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Document Type期刊论文
Identifierhttp://ir.xjipc.cas.cn/handle/365002/4643
Collection中国科学院特殊环境功能材料与器件重点试验室
Affiliation1.Chinese Acad Sci, Xinjiang Tech Inst Phys & Chem, Lab Environm Sci & Technol, Key Lab Funct Mat & Devices Special Environm, Urumqi 830011, Peoples R China
2.Wuhan Univ, Sch Power & Mech Engn, Wuhan 430072, Hubei, Peoples R China
Recommended Citation
GB/T 7714
Li, SN ,Dong, GH ,Hailili, R ,et al. Effective photocatalytic H2O2 production under visible light irradiation at g-C3N4 modulated by carbon vacancies[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2016,190(8):26-35.
APA Li, SN .,Dong, GH .,Hailili, R .,Yang, LP .,Li, YX .,...&Wang, CY .(2016).Effective photocatalytic H2O2 production under visible light irradiation at g-C3N4 modulated by carbon vacancies.APPLIED CATALYSIS B-ENVIRONMENTAL,190(8),26-35.
MLA Li, SN ,et al."Effective photocatalytic H2O2 production under visible light irradiation at g-C3N4 modulated by carbon vacancies".APPLIED CATALYSIS B-ENVIRONMENTAL 190.8(2016):26-35.
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