Chinese Journal of Catalysis ›› 2022, Vol. 43 ›› Issue (7): 1830-1841.DOI: 10.1016/S1872-2067(21)64027-5
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Chun Zhua,b, Jin-Xia Lianga,b,*(), Yang-Gang Wangb, Jun Lib,c,#(
)
Received:
2021-12-12
Accepted:
2021-12-30
Online:
2022-07-18
Published:
2022-05-20
Contact:
Jin-Xia Liang, Jun Li
About author:
Jun Li (Department of Chemistry, Tsinghua University) was invited to join the 5th and 6th Editorial Board of Chin. J. Catal. He received a PhD degree from Chinese Academy of Sciences in 1992 and then did postdoctoral research in Siegen University (Germany) and The Ohio State University (USA) from 1993 to 1997. He then worked as a Research Scientist, Senior Research Scientist, and Chief Scientist at The Ohio State University and Pacific Northwest National Laboratory (USA). He later joined the faculty at Tsinghua University as a ChangJiang Chair Professor. He works in the field of relativistic quantum chemistry, computational catalysis and cluster science, with more than 400 publications and some 40000 citations.
Supported by:
Chun Zhu, Jin-Xia Liang, Yang-Gang Wang, Jun Li. Non-noble metal single-atom catalyst with MXene support: Fe1/Ti2CO2 for CO oxidation[J]. Chinese Journal of Catalysis, 2022, 43(7): 1830-1841.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(21)64027-5
Fig. 1. Structure configurations and the calculated relative energies of functionalized MXenes with different locations of the surface atoms: top views of I-TiC2O2 (a), II-TiC2O2 (b), and III-TiC2O2 (c) side views of I-TiC2O2 (a1), II-TiC2O2 (b1), and III- TiC2O2 (c1), respectively.
Fig. 2. (a) The calculated binding energies of metal (M) single atoms in each of the most stable SACs of M1/TiC2O2. (b) Side and top views of the optimized geometry of Fe1/Ti2CO2. (c) The TDOS of Fe1/Ti2CO2 and PDOS of Fe 3d (black) and O 2p (red) states. (d) Side and top views of PEDD, yellow and blue refer to an increase and decrease of the electron density, respectively. The Fermi level (EF) is set to zero and isovalue = ±0.006 a.u.
Metal | BEM (eV) | Bader charge (|e|) | ||||
---|---|---|---|---|---|---|
TH_a | TH_b | Top_O | ||||
Fe | -3.60 | -2.88 | — | 0.977 | ||
Co | -3.34 | -2.80 | -1.69 | 0.872 | ||
Ni | -3.05 | -2.37 | -1.78 | 0.728 | ||
Cu | -1.98 | -1.75 | -1.48 | 0.781 | ||
Ru | -3.45 | -2.19 | -1.55 | 0.668 | ||
Rh | -2.69 | -2.09 | -1.56 | 0.498 | ||
Pd | -1.41 | -1.44 | -1.23 | 0.430 | ||
Ag | -0.93 | -0.90 | -0.72 | 0.709 | ||
Os | -3.23 | -1.90 | — | 0.720 | ||
Ir | -2.72 | -1.83 | -1.36 | 0.401 | ||
Pt | -1.78 | -1.49 | -1.40 | 0.252 | ||
Au | -0.11 | -0.11 | -0.31 | 0.342 |
Table 1 The calculated binding energies for metals (M) single atoms located at different sites of the TiC2O2 surfaces of M1/TiC2O2, the Bader charges (|e|) of metals in each of the most stable M1/TiC2O2.
Metal | BEM (eV) | Bader charge (|e|) | ||||
---|---|---|---|---|---|---|
TH_a | TH_b | Top_O | ||||
Fe | -3.60 | -2.88 | — | 0.977 | ||
Co | -3.34 | -2.80 | -1.69 | 0.872 | ||
Ni | -3.05 | -2.37 | -1.78 | 0.728 | ||
Cu | -1.98 | -1.75 | -1.48 | 0.781 | ||
Ru | -3.45 | -2.19 | -1.55 | 0.668 | ||
Rh | -2.69 | -2.09 | -1.56 | 0.498 | ||
Pd | -1.41 | -1.44 | -1.23 | 0.430 | ||
Ag | -0.93 | -0.90 | -0.72 | 0.709 | ||
Os | -3.23 | -1.90 | — | 0.720 | ||
Ir | -2.72 | -1.83 | -1.36 | 0.401 | ||
Pt | -1.78 | -1.49 | -1.40 | 0.252 | ||
Au | -0.11 | -0.11 | -0.31 | 0.342 |
Fig. 3. (a) The optimized geometry of CO adsorbed on Fe1/Ti2CO2 (top and side view). (b) calculated PEDD, with yellow and blue color referring to an increase and decrease of the electron density, respectively (isovalue = ±0.006 a.u.). (c) PDOS of Fe 3d (black) and C 2p (red) states, with the Fermi level set to zero. O atom (pink) in CO, C atom (light blue) in CO.
Fig. 4. (a) The optimized geometry of O2 adsorbed on Fe1/Ti2CO2 (top and side view). (b) Calculated PEDD, with yellow and blue color referring to an increase and decrease of the electron density, respectively (isovalue = ±0.006 a.u.). (c) PDOS of Fe 3d (black) and O 2p (red) states, with the Fermi level set to zero.
Fig. 5. The optimized geometries of CO and/or O2 molecules co-adsorbed on Fe1/Ti2CO2 (top and side view): (a) for two CO molecules, (b) for two CO molecules, (c) for a CO and an O2 molecule, (d) for CO and O2 molecules, (e) for two CO and an O2 molecule Calculated PEDD, (f) for CO and O2 molecules, with yellow and blue color referring to an increase and decrease of the electron density, respectively (isovalue = ±0.006 a.u.).
Fig. 6. Calculated energy profile and optimized geometries of the intermediates and transition states for formation of the first CO2 catalyzed by Fe1/Ti2CO2 via L-H mechanism, in which the TS is marked with redlines and the relative energies and bond distances are given in eV and Å, respectively.
Fig. 7. Calculated energy profile and optimized geometries of the intermediates and transition states for the formation of the second CO2 catalyzed by Fe1/Ti2CO2 via L-H mechanism, in which the TS is marked with redlines and the relative energies and bond distances are in eV and Å, respectively.
Fig. 8. Calculated energy profile and optimized geometries of the intermediates and transition states for the formation of the first CO2 catalyzed by Fe1/Ti2CO2 via E-R mechanism, where the TS is marked with redlines and the relative energies and bond distances are in eV and Å, respectively.
Fig. 9. Calculated energy profile and optimized geometries of the intermediates and transition states for the formation of the second CO2 catalyzed by Fe1/Ti2CO2 via E-R mechanism, where the TS is marked with redlines and the relative energies and bond distances are in eV and Å, respectively.
Fig. 10. Calculated energy profile and optimized geometries of the intermediates and transition states for the formation of the first CO2 catalyzed by Fe1/Ti2CO2 via MvK mechanism, where the TS is marked with redlines and the relative energies and bond distances are in eV and Å, respectively.
Fig. 11. Calculated energy profile and optimized geometries of the corresponding stationary points for CO oxidation catalyzed by Fe1/Ti2CO2 via the TER step mechanism, where the TS is marked with redlines and the relative energies and bond distances are in eV and Å, respectively.
Fig. 12. Calculated energy profile and optimized geometries of the intermediates and transition statesfor CO oxidation catalyzed by Fe1/Ti2CO2 via TLH mechanism, where the TS is marked with redlines and the relative energies and bond distances are in eV and Å, respectively.
Fig. 13. Calculated Bader charges of Fe1 SAs, the adsorbed O2 and C atoms of CO for CO oxidation in the structures of elementary steps in TLH mechanism.
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