CO2 Adsorption on Ti3O6-: A Novel Carbonate Binding Motif

Sreekanta Debnath, Xiaowei Song, Matias R. Fagiani, Marissa L. Weichman, Min Gao, Satoshi Maeda, Tetsuya Taketsugu, Wieland Schöllkopf, Andrey Lyalin, Daniel M. Neumark, Knut R. Asmis

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4 Scopus citations

Abstract

CO2 adsorption on Ti3O6-, which serves as a model for an oxygen vacancy on a titania surface, is studied using infrared photodissociation (IRPD) spectroscopy in combination with density functional theory (DFT) and coupled cluster computations, as well as a recently developed multicomponent artificial force induced reaction method. The IRPD spectra of D2-tagged [(Ti3O6)(CO2)n]-, with n = 1, 2, are reported in the spectral window of 450-2400 cm-1 and assigned based on a comparison to harmonic IR spectra from the DFT calculations. We find that CO2 binding leaves the unpaired electron largely unperturbed. The first two CO2 molecules adsorb chemically to Ti3O6- by incorporating a formally doubly negatively charged, either doubly or triply coordinated O atom to form a bidentate or tridentate bridging carbonate dianion (CO32-), respectively. The latter binding motif exhibits a characteristic IR signature in the form of an intense doublet of peaks near 1400 cm-1 stemming from two antisymmetric carbonate stretching modes.

Original languageEnglish (US)
Pages (from-to)8439-8446
Number of pages8
JournalJournal of Physical Chemistry C
Volume123
Issue number13
DOIs
StatePublished - Apr 4 2019

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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    Debnath, S., Song, X., Fagiani, M. R., Weichman, M. L., Gao, M., Maeda, S., Taketsugu, T., Schöllkopf, W., Lyalin, A., Neumark, D. M., & Asmis, K. R. (2019). CO2 Adsorption on Ti3O6-: A Novel Carbonate Binding Motif. Journal of Physical Chemistry C, 123(13), 8439-8446. https://doi.org/10.1021/acs.jpcc.8b10724