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• W4323660531 endingPage "5394" @default.
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• W4323660531 abstract "Hydrogen evolution reaction (HER) is directly relevant to green hydrogen production from water splitting. Recently, a low-cost Ni5P4 material has been demonstrated experimentally and theoretically to exhibit excellent electrocatalytic activity toward HER. However, a fundamental understanding of the origin of Ni5P4(0001) activity is still lacking. In this work, density functional theory (DFT) calculations were employed for a comprehensive investigation. The calculation results indicate that the Ni5P4(0001) surface exposing Ni3P4 termination gains the highest stability, on which a nearly thermoneutral hydrogen adsorption was found at the P3-hollow sites, providing a high activity for HER. The activity was also observed to be maintained over a wide H-coverage. HER occurs via the Volmer-Heyrovsky mechanism as evidenced from the optimal hydrogen adsorption free energy, but unlikely through the Tafel reaction due to its large energy barrier. Furthermore, the P3-hollow sites also exhibit a low kinetic barrier for water dissociation, promoting HER in alkaline media. A series of electronic structure analyses were performed in gaining insights into the origin of the HER activity. First, the density of states (DOS) and crystal orbital Hamilton population (COHP) analyses revealed a favorable interaction of electronic states between P and H atoms, leading to stable H adsorption at P3-hollow sites. In addition, the Bader charge analysis demonstrates that the strength of H adsorption at P3-hollow sites linearly increases with the electrons carried by the latter. The optimal net charge on the P3-hollow sites leads to a desired ΔGH that is close-to-zero. Finally, a highly efficient electron transfer was observed between the P3-hollow sites and their neighboring atoms, facilitating the HER." @default.
• W4323660531 created "2023-03-10" @default.
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• W4323660531 date "2023-03-09" @default.
• W4323660531 modified "2023-09-26" @default.
• W4323660531 title "Insights into the Origin of High Activity of Ni₅P₄(0001) for Hydrogen Evolution Reaction" @default.
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• W4323660531 doi "https://doi.org/10.1021/acs.jpcc.3c00238" @default.
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• W4323660531 hasPublicationYear "2023" @default.
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