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A novel N-doped graphene oxide enfolded reduced titania for highly stable and selective gas-phase photocatalytic CO2 reduction into CH4: An in-depth study on the interfacial charge transfer mechanism

Title
A novel N-doped graphene oxide enfolded reduced titania for highly stable and selective gas-phase photocatalytic CO2 reduction into CH4: An in-depth study on the interfacial charge transfer mechanism
Authors
Hiragond, Chaitanya B.Lee, JunhoKim, HwapyongJung, Jin-WooCho, Chang-HeeIn, Su-Il
DGIST Authors
Hiragond, Chaitanya B.; Lee, Junho; Kim, Hwapyong; Jung, Jin-Woo; Cho, Chang-HeeIn, Su-Il
Issue Date
2021-07
Citation
Chemical Engineering Journal, 416, 127978
Type
Article
Author Keywords
Reduced titaniaN-doped GOPhotocatalysisCO2 reductionFlow-reactor system
Keywords
POLYMERIC CARBON NITRIDEPT/TIO2 PHOTOCATALYSTSTIO2 NANOPARTICLES001 FACETSEFFICIENTPHOTOREDUCTIONDIOXIDENANOCOMPOSITESPERFORMANCECOMPOSITES
ISSN
1385-8947
Abstract
A desire for renewable alternatives to fossil fuels can be achieved by utilizing CO2, H2O, and solar energy to generate solar fuels. A novel N-doped graphene oxide enfolded reduced titania (NGO-RT) composite was demonstrated for photocatalytic CO2 reduction into CH4. Later, a small amount of Pt NPs was deposited on NGORT that increases the catalytic performance towards CH4 formation. The optimized Pt-1.0%-NGO-RT catalyst displayed a selective visible-light CO2 reduction into CH4 using a flow reactor system with approximate to 12 and approximate to 2 times higher activity than pristine RT and NGO-RT, respectively. The catalyst demonstrated long-term stability over 35 h. The photo-induced CO2 reduction mechanism was first validated through the electron transfer process, where charge trapping by Ti3+ states near the conduction band of RT plays a vital role in the selective CH(4 )evolution. These trapped electrons transfer from RT to the closely connected interface of N-doped graphene oxide and Pt NPs to restrict the recombination of electron/hole pair. The improved catalytic performance can be attributed to RT's downward band bending at the NGO-RT interface, where electron transfer from RT to NGO decreases the charge recombination.
URI
http://hdl.handle.net/20.500.11750/15425
DOI
10.1016/j.cej.2020.127978
Publisher
Elsevier BV
Related Researcher
  • Author Cho, Chang-Hee Future Semiconductor Nanophotonics Laboratory
  • Research Interests Semiconductor; Nanophotonics; Light-Matter Interaction
Files:
There are no files associated with this item.
Collection:
Department of Physics and ChemistryFuture Semiconductor Nanophotonics Laboratory1. Journal Articles
Department of Energy Science and EngineeringGreen and Renewable Energy for Endless Nature(GREEN) Lab1. Journal Articles


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