The
rational design and fabrication of Pt-based electrocatalysts
with multiple active sites for hydrogen evolution reaction (HER) are
urgently needed for water splitting. Herein, through microstrain engineering,
one-dimensional porous nanowires (NWs) with tailored Ni
x
S2/PtNi heterostructures have been prepared
by the sulfurization of PtNi NWs. The catalyst exhibited superb HER
electrocatalytic activity in both alkaline and acid media. The overpotentials
of the optimal catalyst NiS2/PtNi at 10 mA cm–2 for HER are as low as 14 and 15 mV in 0.1 M KOH and 0.1 M HClO4, respectively, much lower than those of a state-of-the-art
commercial Pt/C catalyst. The Ni
x
S2/PtNi heterostructures with tailored electronic structure
and abundant microstrains play as the HER active sites. In addition,
the synergistic effect between the Ni3S2 or
NiS2 and PtNi contributes the boosted HER performance in
either alkaline medium. This work provides an effective method for
developing Pt-based HER catalysts by microstrain engineered heterostructures.
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