Understanding the Interactions of CO2 with Doped and Undoped SrTiO3

Abstract SrTiO 3 and doped SrTiO 3 have a wide range of applications in different fields. For example, Rh‐doped SrTiO 3 has been shown to have photocatalytic activity for both hydrogen production and CO 2 conversion. In this study, both undoped and Rh‐doped SrTiO 3 were synthesized by hydrothermal and polymerizable complex methods. Different characterizations techniques including X‐ray photoelectron spectroscopy (XPS), XRD, Raman, and UV/Vis spectroscopy were utilized to establish correlations between the preparation methods and the electronic/structural properties of Rh‐doped SrTiO 3 . The presence of dopants and oxygen vacancies substantially influenced the CO 2 interactions with the surface, as revealed by the in situ infrared spectroscopic study. The presence of distinctly different adsorption sites was correlated to oxygen vacancies and oxidation states of Ti and Rh.