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TiO2is one of the most studied metal oxide photocatalysts and has unparal-leled efficiency and stability. This cheap, abundant, and non-toxic material has the potential to address future environmental and energy concerns. Understanding about the photoinduced interfacial redox events on TiO2could have profound effect on the degradation of organic pollutants, splitting of H2O into H2and O2, and selective redox organic transformations. Scientists traditionally accept that for a semiconductor photocatalyst such as TiO2under the illumination of light with energy larger than its band gap, two photocarriers will be created to carry out their independent reduction and oxidation processes. However, our recent discoveries indicate that it is the concerted rather than independent effect of both photocarriers of valence band hole (hvb+) and conduction band electron (ecb–) that dictate the product formation during interfacial oxidation event mediated by TiO2photocatalysis. [ABSTRACT FROM AUTHOR]