Adsorption and Photocatalytic Reduction of Carbon Dioxide on TiO<sub>2</sub>

oleh: Oleksandr Shtyka, Viktar Shatsila, Radoslaw Ciesielski, Adam Kedziora, Waldemar Maniukiewicz, Sergey Dubkov, Dmitry Gromov, Andrey Tarasov, Jacek Rogowski, Andrey Stadnichenko, Petr Lazarenko, Roman Ryazanov, Malgorzata I. Szynkowska-Jóźwik, Tomasz Maniecki

Format: Article
Diterbitkan: MDPI AG 2020-12-01

Deskripsi

The photocatalytic activity of TiO<sub>2</sub> depends on numerous factors, such as the chemical potential of electrons, charge transport properties, band-gap energy, and concentration of surface-active sites. A lot of research has been dedicated to determining the properties that have the most significant influence on the photocatalytic activity of semiconductors. Here, we demonstrated that the activity of TiO<sub>2</sub> in the gas-phase reduction of CO<sub>2</sub> is governed mainly by the desorption rate of the reaction intermediates and final products. This indicates that the specific surface area of TiO<sub>2</sub> and binding strength of reaction intermediates and products are the main factors affecting the photocatalytic activity of TiO<sub>2</sub> in the investigated process. Additionally, it was shown that rutile exhibits higher photocatalytic activity than anatase/rutile mixtures mainly due to its high efficiency in the visible portion of the electromagnetic spectrum.