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Reduced TiO2 quantum dots/graphene for solar light driven CO2 reduction into precisely controlled C-1 vs C-2 hydrocarbon products without noble Co-catalyst

Title
Reduced TiO2 quantum dots/graphene for solar light driven CO2 reduction into precisely controlled C-1 vs C-2 hydrocarbon products without noble Co-catalyst
Author(s)
Hwang, YunjuSorcar, SauravLee, JunhoJung, JinwooCho, Chang-HeeIn, Su-Il
Issued Date
2023-02
Citation
Journal of Power Sources, v.556
Type
Article
Keywords
CARBON-DIOXIDEARTIFICIAL PHOTOSYNTHESISPHOTOCATALYTIC REDUCTIONDOPED TIO2WATERCH4PHOTOREDUCTIONNANOCRYSTALSNITROGENANATASE
ISSN
0378-7753
Abstract
Photocatalytic CO2 reduction is a logical approach to overcome the energy crisis as well as to curb the anthropogenic CO2 emission by converting atmospheric CO2 with water vapour under irradiation into hydrocarbon fuels. Herein, for the first time, a noble metal-free photocatalyst comprised of reduced TiO2 quantum dots (TQDs) dispersed over graphene sheets has been successfully synthesized and employed for this reaction. EELS investigation reveals the addition of graphene has imparted oxygen vacancies inside TQDs, which in turn helps to enhance broad solar light absorption. TRPL spectroscopy revealed a prolonged charge separation in the heterostructure. Depending on graphene content, the ratio of the products has been changed; CH4:C2H6 from 3.41:1 to 1:1.62. The optimized sample exhibits 2.8- and 3.7-fold increment of CH4 and C2H6 yields compared to TQDs. Under the continuous mode, the photocatalyst has shown excellent stability of 72 h. © 2022 Elsevier B.V.
URI
http://hdl.handle.net/20.500.11750/46077
DOI
10.1016/j.jpowsour.2022.232430
Publisher
Elsevier
Related Researcher
  • 조창희 Cho, Chang-Hee
  • Research Interests Semiconductor; Nanophotonics; Light-Matter Interaction
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Appears in Collections:
Department of Physics and Chemistry Future Semiconductor Nanophotonics Laboratory 1. Journal Articles
Department of Energy Science and Engineering Green and Renewable Energy for Endless Nature(GREEN) Lab 1. Journal Articles

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