Chinese Journal of Catalysis ›› 2024, Vol. 63: 244-257.DOI: 10.1016/S1872-2067(24)60084-7
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Nan Mua, Tingting Boa, Yugao Hua, Ruixin Xua, Yanyu Liub,*(), Wei Zhoua,*()
Received:
2024-05-07
Accepted:
2024-06-24
Online:
2024-08-18
Published:
2024-08-19
Contact:
*E-mail: yyliu@tjnu.edu.cn (Y. Liu), weizhou@tju.edu.cn (W. Zhou).
Supported by:
Nan Mu, Tingting Bo, Yugao Hu, Ruixin Xu, Yanyu Liu, Wei Zhou. Single-atom catalysts based on polarization switching of ferroelectric In2Se3 for N2 reduction[J]. Chinese Journal of Catalysis, 2024, 63: 244-257.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(24)60084-7
Fig. 1. (a) The top and side views of geometric structures of the α-In2Se3 monolayer with downward and upward polarization, respectively. Purple and green denote the In atom and Se atom, respectively. The red cycles, blue cycles, and black arrows represent selected TM anchored sites, different Se atoms, and polarization directions, respectively. (b) The partial density of states of the α-In2Se3 monolayer with spin up state. (c) The average potential energy for In2Se3 monolayer along the perpendicular direction. The black arrow represents the direction of the intrinsic electric field. (d) The partial density of states and labelled p band centers of V@↓-In2Se3 and V@↑-In2Se3.
Fig. 3. (a) Schematic of Distal, Alternating and Enzymatic Mechanisms for NRR. (b) Proposed screening strategy of NRR candidate catalysts. (c) N2 absorption free energies with end-on and side-on patterns. (d) The bonding schematic diagrams between N2 and TM. (e) The N-N bond length changes as a function of the excess electrons after N2 adsorption for TM@↑-In2Se3 and TM@↓-In2Se3 via the end-on configuration.
Fig. 4. Free energy changes of *N2 + H+ + e- → *N2H (a) and *NH2 + H+ + e- → *NH3 (b) on TM@↑-In2Se3 with end-on configuration. Free energy changes of *N2 + H+ + e- → *N2H and *NH2 + H+ + e- → *NH3 on TM@↓-In2Se3 with end-on configuration (c) and on TM@↑-In2Se3 with side-on configuration (d). (e) The Gibbs free energy change of PDS for TM@In2Se3. (f) The limiting potentials for NRR and HER of TM@In2Se3 via Distal pathway, Alternating pathway, and Enzymatic pathway.
Fig. 6. The Free energy diagrams during the NRR on V@↓-In2Se3 (a) and V@↑-In2Se3 (b) via distal pathway. Gibbs free energy diagram of the HER on V@↓-In2Se3 (c), V@↑-In2Se3 (d), Mo@↓-In2Se3 (e), Mo@↑-In2Se3 (f).
Fig. 7. The partial density of states of V-3d on the V@↓-In2Se3 (a) and V@↑-In2Se3 (b). (c) Schematic diagram of TM-d orbitals splitting in the different crystal fields. The partial density of states of Mo-4d on the Mo@↓-In2Se3 (d) and Mo@↑-In2Se3 (e). (f) Schematic diagram of the crystal field effect between the dz2 orbital of V atom and the ligand of Se atoms with the FE polarization switching.
Fig. 8. (a) Schematics of N atomic orbitals and N2 molecular orbitals. (b) The partial density of states of free N2. The partial density of states and crystal orbital Hamilton populations of N2 on V@↓-In2Se3 (c) and V@↑-In2Se3 (d) via end-on configuration. The bonding and antibonding states are depicted by cyan and yellow, respectively.
Fig. 9. (a) Interaction diagram between the 2p orbital of N atom and the d orbital of the TM atom with end-on configuration. (b) Important features from the Random Forest model for ΔG*NNH. (c) The linear correlations between the d band center (εd) of TM atom and limiting potential by the distal mechanism on TM@In2Se3. (d) The linear correlations between the excess obtained electrons of N2 and limiting potential by the distal mechanism on TM@In2Se3. (e) Comparison of DFT-calculated UL values with the SISSO-predicted values.
Fig. 11. (a) The differential charge density plots of N2 adsorbed on V@↓-In2Se3 and V@↑-In2Se3. (b) The schematic diagram of three moieties on TM@In2Se3: moieties 1, 2, and 3 represent In2Se3, single TM atom, and adsorbed NxHy, respectively. The charge variations of the three moieties for the NRR on V@↓-In2Se3 (c) and V@↑-In2Se3 (d).
Fig. 12. Surface Pourbaix diagrams of V@↓-In2Se3 (a) and V@↑-In2Se3 (c); Competitive adsorption of *N2 and *H as well as *OH and *O at the V site on V@↓-In2Se3 (b) and V@↑-In2Se3 (d) as a function of electrode potential.
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