First, electrons in TiO2 valence band are excited to the
conduction band under UV irradiation. Then, the photoexcited
electrons are transferred and injected to WO3
(Nenadovic et al., 1984; Tada et al., 2004), because it has a
more positive conduction band than TiO2, and the electrons
are then stored by WO3 along with a redox reaction. After
the UV light is turned off, the stored electrons are released,
and they can react just as the photo-electrons do.
First, electrons in TiO2 valence band are excited to theconduction band under UV irradiation. Then, the photoexcitedelectrons are transferred and injected to WO3(Nenadovic et al., 1984; Tada et al., 2004), because it has amore positive conduction band than TiO2, and the electronsare then stored by WO3 along with a redox reaction. Afterthe UV light is turned off, the stored electrons are released,and they can react just as the photo-electrons do.
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