Precisely controlling the surface and internal atomic structures of platinum (Pt) -based nanocrystals remains a critical challenge for developing high-performance oxygen reduction reaction (ORR) catalysts. Here, we report a gas dynamically confined strategy leveraging hydrogen adsorption to synthesize Pt-based intermetallic nanowires (NWs) with ordered bulk atomic lattices (Pt3Fe L12, Pt3Co L12, PtNi L10) and abundant high-index 311, 211, and 221 facets. Dynamic hydrogen adsorption reduces surface energy and suppresses atomic migration during high-temperature annealing, preserving the one-dimensional morphology and enabling structural ordering, as confirmed by in situ transmission electron microscopy and density functional theory calculations. The resultant ordered Pt3Fe NWs exhibit a mass activity of 0. 98 A mgPt–1 and ultrahigh stability, retaining 93. 9% of mass activity after 30, 000 cycles and 86. 4% of power density after 70, 000 cycles. The synergistic effects of ordered atomic arrangements, high-index facets, and one-dimensional geometry optimize electronic properties and active-site energetics, enhancing both activity and stability. This strategy of designing structurally precise Pt-based intermetallic catalysts demonstrates a potential for application in fuel cell technologies.
Hu et al. (Wed,) studied this question.
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