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Photoinduced charge separation in TiO2 and Cu2O semiconductor nanoparticles   was examined using Electron Paramagnetic Resonance spectroscopy in order to   get insight into the photocatalytic reduction of CO2 in nonaqueous media.   For dissolution/grafting of CO2 we have used carboxy-PEG4-amine, and as a   solvent poly(ethylene glycol) 200. We have found that, in this system,   reduction of CO2 starts at 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 both by thermodynamic   and kinetic parameters, namely by the redox potential of conduction band   electrons and adsorption/binding of CO2 on the surface of nanoparticles

Investigation of the charge-transfer in photo-excited nanoparticles for CO2 reduction in non-aqueous media