| 论文简介 |
Facing the increasingly serious energy and environmental crisis, the development of heteronuclear metal-free double-atom catalysts is a potential strategy to realize efficient catalytic nitrogen reduction with low energy consumption and no pollution. Because it could combine the advantages of flexible active sites in double-atom catalysts with pollution-free and high Faraday efficiency in metal-free catalysts simultaneously. However, according to the existing mechanism, the finite orbits of other non-metallic atoms except boron atom reduce the possibility of metal-free catalysis and hinder the development of heteronuclear metal-free double-atom catalysts. Herein, we propose a new “capture-backdonation-recapture” mechanism, which skillfully uses the electron capture-backdonation-recapture between boron, substrate and other non-metallic elements to solve the above problems. Based on this mechanism, by means of the first-principle calculations, the material structure, adsorption energy, catalytic activity and selectivity of 36 catalysts are systematically investigated to evaluate their catalytic performance. B-Si@BP1 and B-Si@BP3 are selected with good catalytic performance and low limiting potential of -0.14 V and -0.10 V. Meanwhile, the “capture-backdonation-recapture” mechanism is also verified by analyzing the results of adsorption energy and electron transfer. Our work broadens the ideas and lays the theoretical foundation for the development of heteronuclear metal-free double-atom catalysts in the future. |
(创新港)
