Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/138365
Title: Photogenerated charge transfer via interfacial internal electric field for significantly improved photocatalysis in direct Z-scheme oxygen-doped carbon nitrogen/CoAl-layered double hydroxide heterojunction
Authors: Wu, Yan
Wang, Hou
Sun, Yuanmiao
Xiao, Tong
Tu, Wenguang
Yuan, Xingzhong
Zeng, Guangming
Li, Shuzhou
Chew, Jia Wei
Keywords: Science::Chemistry
Issue Date: 2018
Source: Wu, Y., Wang, H., Sun, Y., Xiao, T., Tu, W., Yuan, X., . . . Chew, J. W. (2018). Photogenerated charge transfer via interfacial internal electric field for significantly improved photocatalysis in direct Z-scheme oxygen-doped carbon nitrogen/CoAl-layered double hydroxide heterojunction. Applied Catalysis B: Environmental, 227, 530-540. doi:10.1016/j.apcatb.2018.01.069
Journal: Applied Catalysis B: Environmental
Abstract: Semiconductor heterojunctions, widely applied in photocatalytic solar-to-chemical energy conversion, are advantageous for spatially separating photogenerated charge across the heterojunction boundary, inhibiting carrier recombination processes and synergistically accelerating photocatalytic reaction beyond individual components. Herein, a novel type of 2D-2D heterostructure consisting of oxygen-doped carbon nitride (OCN) and ultrathin CoAl-layered double hydroxide (CoAl-LDH) with the aid of hydrogen bonding has been constructed via in situ growth method. The visible-light photocatalytic degradation efficiency of the hybridized photocatalyst is 38 and 239 folds higher than that of pure OCN and pure CoAl-LDH, respectively. This is due to the strong electronic coupling effect in the heterostructured interface, which induces photogenerated charge transfer from CoAl-LDH to OCN and make for the constrction of an interfacial internal electric field (IIEF) between CoAl-LDH and OCN. Based on the experimental evidence and density functional theory calculations, an IIEF-induced direct Z-scheme charge transfer mechanism has been proposed to enhance the extraction and utilization of photoinduced electron and hole in respectively CoAl-LDH and OCN. This work uncovers the nature of charge transfer system based on a 2D–2D heterostructured system, which can be potentially employed in various fields of photocatalysis.
URI: https://hdl.handle.net/10356/138365
ISSN: 0926-3373
DOI: 10.1016/j.apcatb.2018.01.069
Rights: © 2018 Elsevier B.V. All rights reserved. This paper was published in Applied Catalysis B: Environmental and is made available with permission of Elsevier B.V.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:SCBE Journal Articles

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