학술논문
Investigation of the charge-transfer in photo-excited nanoparticles for CO2 reduction in non-aqueous media.
Document Type
Article
Author
Source
Subject
*PHOTOCATALYSIS
*CHARGE transfer
*PHOTOEXCITATION
*NANOPARTICLES
*CARBON dioxide reduction
*ELECTRON paramagnetic resonance spectroscopy
*DISSOLUTION (Chemistry)
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Language
ISSN
0352-5139
Abstract
Photo-induced charge separation in TiO2 and Cu2O semiconductor nanoparticles was examined using electron paramagnetic resonance spectroscopy in order to obtain insight into the photocatalytic reduction of CO2 in nonaqueous media. For dissolution/grafting of CO2, carboxy-PEG4-amine was used with poly(ethylene glycol) 200 as the solvent. It was found that the reduction of CO2 in this system starts at a potential of -0.5 V vs. Ag/AgCl, which is significantly more positive than the potential for electrochemical reduction of CO2 in most organic solvents and water (-2.0 V vs. Ag/AgCl). The electron transfer from excited nanoparticles to CO2 is governed by both thermodynamic and kinetic parameters, namely by the redox potential of conduction band electrons and adsorption/binding of CO2 on the surface of the nanoparticles. [ABSTRACT FROM AUTHOR]