Overlayer Stacking Promotes Hydrogen Spillover.

Authors

Jinqiu Guo, Hongbo Zhang

Published in

Nano letters. Sep 29, 2025. Epub Sep 29, 2025.

Abstract

Hydrogen spillover (HSO) has attracted significant attention due to its important role in elucidating the synergistic interactions between separated active sites during catalysis; however, it is controversial since the driving force of hydrogen migration is unclear. Herein, atomic layer deposition (ALD) was employed to spatially separate well-defined Pd/Ni nanoparticles (NPs), enabling the clear identification of HSO at mild reaction conditions (i.e., 343 K) during alkyne semihydrogenation over aNi/nMO_x/Pd@support catalysts, in which Pd is unreachable. Interestingly, ALD stacking of the Ti-, Zr-, Zn-, or Al-oxide overlayers significantly enhanced the HSO, attributed to the "chimney effect", and the driving force of hydrogen migration was attributed to the concentration difference between Pd-NPs and Ni-NPs during catalysis.

PMID:
41021752
Bibliographic data and abstract were imported from PubMed on 30 Sep 2025.

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