![]() Taking formic acid (FA) dehydration as the probe reaction, a shallow trap of photoexcited electrons on the (101) facet of anatase TiO 2 favors the dehydration of FA to CO, while a deep trap of photoexcited electrons on the (001) facet makes FA stable. ![]() The different electron trap states strongly affect the ET process, thus regulating the photocatalytic activity. ![]() The photogenerated electrons are shallowly confined in the five-coordinated Ti atom (Ti 5c) on the surface of the (101) facet with a transfer energy below 1.0 eV, while deeply confined in the six-coordinated Ti atom (Ti 6c) on the subsurface of the (001) facet with a transfer energy higher than 1.9 eV. Herein, we have developed a strategy to detect and measure surface electrons’ transfer energy to the adsorbates and disclosed a facet-dependent electron transfer energy over anatase TiO 2. The electron transfer (ET) from the conduction band of the semiconductor to surface-bound species is a key step in the photocatalytic reaction and strongly affects the reactivity and selectivity, while the effect of catalyst surface structure on this process has rarely been explored due to the lack of an effective method.
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