Structure-Tailored Non-Noble Metal-based Ternary Chalcogenide Nanocrystals for Pt-like Electrocatalytic Hydrogen Production.
ChemSusChem
; 14(15): 3074-3083, 2021 Aug 09.
Article
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| MEDLINE
| ID: mdl-34038021
ABSTRACT
A facile microwave-assisted strategy was employed to synthesize Ni3 Bi2 S2 nanocrystals. Variation in the synthesis conditions tuned the composition of monoclinic and orthorhombic phases of Ni3 Bi2 S2 . The electrochemical hydrogen evolution activity of the catalyst with highest percentage of monoclinic phase demonstrated a negligible onset potential of only 24â
mV close to that of state-of-the-art Pt/C with an overpotential as low as 88â
mV. Density functional theory calculations predicted the monoclinic phase exhibit the lowest adsorption free energy corresponding to hydrogen adsorption ( Δ G ads H * ) and, therefore, the highest hydrogen evolution activity amongst the considered phases. The quasi-2D structure of monoclinic phase facilitated an increased charge-transfer between Ni and Bi, favoring the downward shift of the d-band center to enhance the catalytic activity.
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2021
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