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Defect State Assisted Z-scheme Charge Recombination in Bi2O2CO3/Graphene Quantum Dot Composites for Photocatalytic Oxidation of NO

Liu, Yang ; Zhou, Ying ; Yu, Shan ; Xie, Zhanghui ; Chen, Yi ; Zheng, Kaiwen ; Mossin, Susanne ; Lin, Weihua LU ; Meng, Jie and Pullerits, Tonu LU , et al. (2020) In ACS Applied Nano Materials 3(1). p.772-781
Abstract

In this work, we explored the photoinduced charge carriers dynamics rationalizing the photocatalytic oxidation of NO over N-doped Bi2O2CO3/graphene quantum dots composites(N-BOC/GQDs) via time-resolved photoluminescence (TRPL). Under visible light illumination, only GQDs can be photoexcited and inject electrons to N-BOC within 0.5 ns. Under UV light irradiation, the interfacial Z-scheme heterojunction recombination between the electrons in N-BOC and holes in GQDs dominate the depopulation of excited states within 0.36 ns. Such efficient Z-scheme recombination regardless of the large energy difference (1.66 eV) is mediated by the interfacial oxygen vacany defect states characterized by both density... (More)

In this work, we explored the photoinduced charge carriers dynamics rationalizing the photocatalytic oxidation of NO over N-doped Bi2O2CO3/graphene quantum dots composites(N-BOC/GQDs) via time-resolved photoluminescence (TRPL). Under visible light illumination, only GQDs can be photoexcited and inject electrons to N-BOC within 0.5 ns. Under UV light irradiation, the interfacial Z-scheme heterojunction recombination between the electrons in N-BOC and holes in GQDs dominate the depopulation of excited states within 0.36 ns. Such efficient Z-scheme recombination regardless of the large energy difference (1.66 eV) is mediated by the interfacial oxygen vacany defect states characterized by both density functional theory calculations (DFT) and electron paramagnetic resonance (EPR) measurement. This finding provide a novel strategic view to improve the photocatalytic performance of the nanocomposite by interfacial engineering

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
interfacial oxygen vacancy, interfacial Z-scheme heterojunction, NO oxdiation, time-resolved spectroscopy
in
ACS Applied Nano Materials
volume
3
issue
1
pages
772 - 781
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85078488482
ISSN
2574-0970
DOI
10.1021/acsanm.9b02276
language
English
LU publication?
yes
id
00532315-b128-404f-b0d5-059287060dbf
date added to LUP
2020-02-10 14:36:07
date last changed
2020-12-29 01:32:59
@article{00532315-b128-404f-b0d5-059287060dbf,
  abstract     = {<p>In this work, we explored the photoinduced charge carriers dynamics rationalizing the photocatalytic oxidation of NO over N-doped Bi<sub>2</sub>O<sub>2</sub>CO<sub>3</sub>/graphene quantum dots composites(N-BOC/GQDs) via time-resolved photoluminescence (TRPL). Under visible light illumination, only GQDs can be photoexcited and inject electrons to N-BOC within 0.5 ns. Under UV light irradiation, the interfacial Z-scheme heterojunction recombination between the electrons in N-BOC and holes in GQDs dominate the depopulation of excited states within 0.36 ns. Such efficient Z-scheme recombination regardless of the large energy difference (1.66 eV) is mediated by the interfacial oxygen vacany defect states characterized by both density functional theory calculations (DFT) and electron paramagnetic resonance (EPR) measurement. This finding provide a novel strategic view to improve the photocatalytic performance of the nanocomposite by interfacial engineering</p>},
  author       = {Liu, Yang and Zhou, Ying and Yu, Shan and Xie, Zhanghui and Chen, Yi and Zheng, Kaiwen and Mossin, Susanne and Lin, Weihua and Meng, Jie and Pullerits, Tonu and Zheng, Kaibo},
  issn         = {2574-0970},
  language     = {eng},
  number       = {1},
  pages        = {772--781},
  publisher    = {The American Chemical Society (ACS)},
  series       = {ACS Applied Nano Materials},
  title        = {Defect State Assisted Z-scheme Charge Recombination in Bi<sub>2</sub>O<sub>2</sub>CO<sub>3</sub>/Graphene Quantum Dot Composites for Photocatalytic Oxidation of NO},
  url          = {http://dx.doi.org/10.1021/acsanm.9b02276},
  doi          = {10.1021/acsanm.9b02276},
  volume       = {3},
  year         = {2020},
}