Chinese Journal of Catalysis ›› 2023, Vol. 52: 263-270.DOI: 10.1016/S1872-2067(23)64500-0
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Ji Zhanga, Aimin Yub, Chenghua Sunb,*()
Received:
2023-06-04
Accepted:
2023-07-28
Online:
2023-09-18
Published:
2023-09-25
Contact:
*E-mail: Ji Zhang, Aimin Yu, Chenghua Sun. Theoretical insights into heteronuclear dual metals on non-metal doped graphene for nitrogen reduction reaction[J]. Chinese Journal of Catalysis, 2023, 52: 263-270.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(23)64500-0
Fig. 1. DAC model and reaction process of NRR. (a) Two types of transition metal atoms bounded to the defective graphene matrix along with six nitrogen atoms and another non-metallic atom as its ligands. (b) Schematic representation of NRR mechanisms, including alternating, distal, and enzymatic processes.
Fig. 2. Calculated Gibbs free energy changes for the first and last hydrogenation steps of NRR on M1M2-X catalysts. The dash line represents the value at 0.50 eV. The cyan area encompasses the most promising candidates for NRR.
Fig. 6. Study of N2 activation. (a) Optimized configurations of each intermediate adsorbed on the RuMo-B surface for NRR along with the enzymatic pathway under side-on configuration. (b) Diagrams of charge density differences in RuMo-B with N2 adsorption under side-on configuration (the charge density accumulation and depletion areas are displayed in yellow and cyan). (c) projected crystal orbital Hamilton populations (pCOHP) for N-N bonded to Ru-B, Mo-B, and RuMo-B under side-on configuration, respectively; PDOS before (d) and after (e) N2 was adsorbed on Ru-B, Mo-B, and RuMo-B, respectively (the d orbital of the metal atom is represented by the black line, and the N-2p orbital is represented by gray areas).
Fig. 7. Schematic diagram of dual-atom synergistic effect between Ru and Mo atoms, which enhance the NRR activity via moderation of the d-band center of catalysts, shown at the middle of the graph.
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