American Chemical Society
jp106579b_si_001.pdf (1.04 MB)

A Theoretical Study of CO2 Anions on Anatase (101) Surface

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journal contribution
posted on 2010-12-16, 00:00 authored by Haiying He, Peter Zapol, Larry A. Curtiss
Binding configurations of CO2 and CO2 on perfect and oxygen-deficient anatase (101) surfaces were explored using first-principles calculations on both cluster and periodic models. The solvent effect was taken into account via the polarizable continuum model. Analysis of molecular orbitals, charge, and spin density distributions was used to help identify the radical anion CO2 adsorbed on the surface. On defect-free surfaces, it is found to bind as a bridging bidentate configuration with both oxygens coordinating to the 5-fold Ti ions. Analysis of vibrational frequencies provides a specific signature of the CO2 anion to distinguish it from other species in experiments. The reduction potential of adsorbed CO2 on a (101) surface is lower by 0.24 V than the reduction potential of a CO2 molecule, both in aqueous solution, due to the formation of hybridized orbitals, which facilitates charge transfer to CO2. The reduced (101) surface of TiO2 is much more favorable for CO2 binding with accompanying charge transfer to CO2.