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

Yang Liu | Zendy; Ying Zhou | Zendy; Shan Yu | Zendy; Zhanghui Xie | Zendy; Yi Chen | Zendy; Kaiwen Zheng | Zendy; Susanne Mossin | Zendy; Weihua Lin | Zendy; Jie Meng | Zendy; Tönu Pullerits | Zendy; Kaibo Zheng | Zendy

Open Access

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

Author(s) -

Yang Liu,

Ying Zhou,

Shan Yu,

Zhanghui Xie,

Yi Chen,

Kaiwen Zheng,

Susanne Mossin,

Weihua Lin,

Jie Meng,

Tönu Pullerits,

Kaibo Zheng

Publication year - 2020

Publication title -

acs applied nano materials

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.227

H-Index - 29

ISSN - 2574-0970

DOI - 10.1021/acsanm.9b02276

Subject(s) - photocatalysis , quantum dot , electron paramagnetic resonance , photoluminescence , materials science , graphene , excited state , nanocomposite , heterojunction , photochemistry , density functional theory , charge carrier , electron , recombination , atomic physics , nanotechnology , optoelectronics , chemistry , physics , computational chemistry , catalysis , nuclear magnetic resonance , biochemistry , quantum mechanics , gene

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 timeresolved 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

The content you want is available to Zendy users.

Already have an account? Click here to sign in.

Having issues? You can contact us here

Accelerating Research