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Schematic energy level characterizing the surface and bulk electronic states of TiO2, as well as the oxidation potential value of CO and H2. The adsorption of H2 causes the elevation of Fermi level (from EF to EF* (a quasi-Fermi level)) under UV irradiation, resulting in H2 accepting electrons from TiO2, while CO still donate electrons to TiO2. Reproduced with permission from [52].
