DOI: 10.1016/j.scib.2021.05.007
论文题名: New carbon nitride close to C6N7 with superior visible light absorption for highly efficient photocatalysis
作者: Zhao X. ; Zhao Y. ; Tan H. ; Sun H. ; Qin X. ; Ho W. ; Zhou M. ; Lin J. ; Li Y.
刊名: Science Bulletin
ISSN: 20959273
出版年: 2021
卷: 66, 期: 17 起始页码: 1764
结束页码: 1772
语种: 英语
中文关键词: Carbon nitride
; Oxamide
; Photocatalytic hydrogen production
; Photocatalytic oxidation of diphenylhydrazine
; Urea
英文关键词: Biodegradation
; Carbon nitride
; Density functional theory
; Design for testability
; Light absorption
; Metabolism
; Photocatalytic activity
; Uranium dioxide
; Design and construction
; Hot topics
; Oxamides
; Photocatalytic hydrogen production
; Photocatalytic oxidation of diphenylhydrazine
; Rational construction
; Rational design
; Two-dimensional
; UO$-2$
; Visible light absorption
; Hydrogen production
英文摘要: The rational design and construction of novel two-dimensional (2D) carbon nitrides (CNs) beyond g-C3N4 is a hot topic in the fields of chemistry and materials. Inspired by the polymerisation of urea, we have prepared a series of novel C–C bridged heptazine CNs UOx (where x is the ratio of urea to oxamide, x = 1, 1.5, 2, 2.5, and 3), which are similar to (C6N7)n, upon the introduction of oxamide. As predicted using density functional theory (DFT) calculations, the conjugated structure of UOx was effectively extended from an individual heptazine to the entire material. Consequently, its bandgap was reduced to 2.05 eV, and its absorption band edge was significantly extended to 600 nm. Furthermore, its carrier transfer and separation were significantly enhanced, establishing its superior photocatalytic activity. The optimised UO2 exhibits a superior photocatalytic hydrogen production rate about 108.59 μmol h−1 (using 10 mg of catalyst) with an apparent quantum efficiency (AQE) of 36.12% and 0.33% at 420 and 600 nm, respectively, which is one of the most active novel CNs reported to date. Moreover, UO2 exhibits excellent photocatalytic activity toward the oxidation of diphenylhydrazine to azobenzene with conversion and selectivity reaching ~100%, which represents a promising highly efficient 2D CN material. Regarding phenols degradation, UO2 also displayed significantly higher activity and durability during the degradation of phenol when compared to traditional g-C3N4, highlighting its significant potential for application in energy, environment and photocatalytic organic reactions. © 2021 Science China Press Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170522
Appears in Collections: 气候变化与战略
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作者单位: Key Laboratory of Polyoxometalate and Reticular Material Chemistry of Ministry of Education, Faculty of Chemistry Northeast Normal University, Changchun, 130024, China; Department of Science and Environmental Studies, The Education University of Hong Kong, Hong Kong
Recommended Citation:
Zhao X.,Zhao Y.,Tan H.,et al. New carbon nitride close to C6N7 with superior visible light absorption for highly efficient photocatalysis[J]. Science Bulletin,2021-01-01,66(17)