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Theoretical Predication on the High Hydrogen Evolution Catalytic Activity for the Cubic and Tetragonal SnP Systems

Abstract

By means of density functional theory (DFT) calculations, we have systematically investigated the structures and hydrogen evolution reaction (HER) catalytic activities for the cubic and tetragonal SnP systems, both of which can be viewed as the stacking of SnP layer possessing the similar structural feature to the famous phosphorene. It is revealed that the (111) and (200) facets are possible exposed surfaces for the cubic structure, while the possible exposed surfaces for tetragonal structure are (101), (10¯1), (110), (002) and (00¯2) facets. The computed surface energies reveal that the P-terminated (111) surface and the (200) surface for cubic SnP system as well as the P-terminated (101) and (10¯1) surfaces as well as the (110) surface for the tetragonal SnP system can be considered as the more stable surfaces, in view of more favorable surface energy. The computed free energy values of H* (ΔGH*) show that all these stable surfaces can possess the considerably high HER catalytic activity over a wide range of hydrogen coverage. It is found that the top sites over P atoms can serve as the most active sites on these surfaces, and the tetragonal structure can even exhibit higher HER activity than the cubic structure. Moreover, the correlative catalytic mechanisms have been analyzed in detail. Coupled with the metallic conductivity, two kinds of bulk SnP systems can be very promising candidates as the high-performance and low-cost HER electrocatalyst. All these fascinating findings can be beneficial for promoting the application of excellent SnP-based materials in catalyzing the water splitting process.

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Publication details

The article was accepted on 07 Feb 2019 and first published on 08 Feb 2019


Article type: Paper
DOI: 10.1039/C9CP00618D
Citation: Phys. Chem. Chem. Phys., 2019, Accepted Manuscript

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    Theoretical Predication on the High Hydrogen Evolution Catalytic Activity for the Cubic and Tetragonal SnP Systems

    J. Liu, G. Yu, R. Zhang, X. Huang and W. Chen, Phys. Chem. Chem. Phys., 2019, Accepted Manuscript , DOI: 10.1039/C9CP00618D

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