Chinese Journal of Catalysis ›› 2022, Vol. 43 ›› Issue (4): 1139-1147.DOI: 10.1016/S1872-2067(21)63950-5
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Shaokang Yang, Chaonan Zhang, Dewei Rao*(), Xiaohong Yan
Received:
2021-09-09
Accepted:
2021-09-09
Online:
2022-03-05
Published:
2022-03-01
Contact:
Dewei Rao
Supported by:
Shaokang Yang, Chaonan Zhang, Dewei Rao, Xiaohong Yan. Synergistic interaction of Nb atoms anchored on g-C3N4 and H+promoting high-efficiency nitrogen reduction reaction[J]. Chinese Journal of Catalysis, 2022, 43(4): 1139-1147.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(21)63950-5
Fig. 1. Optimized structure of Nb1@g-C3N4 (a), Nb2@g-C3N4 (b), Nb3@g-C3N4 (c), and Nb4@g-C3N4 (d); The computed PDOS of Nb1@g-C3N4 (e), Nb2@g-C3N4 (f), Nb3@g-C3N4 (g) and Nb4@g-C3N4 (h); The energy profiles of the formation and dissociation (i) and the AIMD result (j) at 500 K for Nb3@g-C3N4. The Fermi level was shifted to zero. The brown, silver and green balls represent C, N and Nb atoms, respectively.
Fig. 2. The computed charge density difference and projected density of states of Nb1@g-C3N4 (a), Nb2@g-C3N4 (b), Nb3@g-C3N4 (c) and Nb4@g-C3N4 (d) after N2 adsorbed on the surface while the bonding and antibonding states in COHP depicted by up and down in blue shaded areas. The contributions by the orbitals of N2 and the d orbitals of Nb atom are shown in blue and green, respectively. The brown, silver and green balls denote C, N and Nb atoms, respectively. The isosurface is set to 0.004 e/Å3and the red area represents the accumulation of electrons, the green area represents the loss of electrons.
Fig. 3. Gibbs free energy diagram and the reaction intermediates for NRR through the mixed mechanism on Nb3@g-C3N4. The brown, silver, green and white balls denote C, N, Nb and H atoms, respectively.
Fig. 4. (a) The structure of *NH2 + *H (up) and *NH2 (down); (b) the PDOS of *NH2 + *H (up) and *NH2 (down) species in the system of Nb3@g-C3N4. The green area represents the contribution of Nb atoms. The blue, sky blue, yellow and pink lines indicate the orbitals of N, H1, H2 and H3, respectively. (c,d) The COHP between two metal atoms (NbI, NbII) and the N in *NH2 species in the system of Nb3@g-C3N4; (e,f) The COHP between the two metal atoms (NbI, NbII) and the N in *NH2 + *H species in the system of Nb3@g-C3N4; (g) The correlation between the ICOHP of Nb?N and ΔE(*NH2).
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