Experimental evidence for coupled ion and electron transfer on TiO2 surface (IMAGE)
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In situ XPS spectra of Ti 2p (a) and O 1s (b) in TiO2 in the dark and under illumination; (c) TOF-SIMS spectra of D depth profile of TiO2 in the dark and under illumination, in the mixture solution of D2O and H218O with and without methanol as hole scavenger; (d) in situ EPR spectra of TiO2 in the dark and under illumination in N2; (e) TOF-SIMS spectra of 18O depth profile of TiO2 in the dark and under illumination, in the mixture solution of D2O and H218O; (f) Schematic diagram for surface composition of TiO2 under illumination.
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