4.6 Article

Effect of Bimetallic Dimer-Embedded TiO2(101) Surface on CO2 Reduction: The First-Principles Calculation

Journal

MATERIALS
Volume 15, Issue 7, Pages -

Publisher

MDPI
DOI: 10.3390/ma15072538

Keywords

dimer; TiO2(101); CO2 reduction; metal-embedded; catalyst; first principles

Funding

  1. National Natural Science Foundation of China [11805295, 11804311]
  2. key scientific and technological project of Henan Province [212102210490, 222102230087]
  3. Zhongyuan University of Technology [2018XQG17]

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The effect of a bimetallic dimer-embedded anatase TiO2(101) surface on CO2 reduction behaviors was explored using first-principles calculations. The results showed that Zn-Cu dimer could stably stay on the TiO2 surface and promote the adsorption and reduction of CO2. In terms of barrier energy and activity, Zn-Cu dimer might be a more suitable and economical choice.
The first-principles calculation was used to explore the effect of a bimetallic dimer-embedded anatase TiO2(101) surface on CO2 reduction behaviors. For the dimer-embedded anatase TiO2(101) surface, Zn-Cu, Zn-Pt, and Zn-Pd dimer interstitials could stably stay on the TiO2(101) surface with a binding energy of about -2.36 eV, as well as the electronic states' results. Meanwhile, the results of adsorption energy, structure parameters, and electronic states indicated that CO2 was first physically and then chemically adsorbed much more stably on these three kinds of dimer-embedded TiO2(101) substrate with a small barrier energy of 0.03 eV, 0.23 eV, and 0.12 eV. Regarding the reduction process, the highest-energy barriers of the CO2 molecule on the Zn-Cu dimer-embedded TiO2(101) substrate was 0.31 eV, which largely benefited the CO2-reduction reaction (CO2RR) activity and was much lower than that of the other two kinds of Zn-Pt and Cu-Pt dimer-TiO2 systems. Simultaneously, the products CO* and *O* of CO2 reduction were firmly adsorbed on the dimer-embedded TiO2(101) surface. Our results indicated that a non-noble Zn-Cu dimer might be a more suitable and economical choice, which might theoretically promote the designation of high CO2RR performance on TiO2 catalysts.

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