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- W3085238411 abstract "Single-atom alloys can be effective catalysts and have been compared to supported single-atom catalysts. To rationally design single-atom alloys and other surfaces with localized ensembles, it is crucial to understand variations in reactivity when varying the dopant and the ensemble size. Here, we examined hydrogen adsorption on surfaces embedded with localized clusters and discovered general trends. Counterintuitively, increasing the amount of a more reactive metal sometimes makes a surface site less reactive. This behavior is due to the hybridization and splitting of narrow peaks in the electronic density of states of many of these surfaces, making them analogous to free-standing nanoclusters. When a single-atom alloy has a peak just below the Fermi energy, the corresponding two-dopant cluster often has weaker adsorption than the single-atom alloy due to splitting of this peak across the Fermi energy. Furthermore, single-atom alloys have qualitatively different behaviors than larger ensembles. Specifically, the adsorption energy is a U-shaped function of the dopant’s group for single-atom alloys. Additionally, adsorption energies on single-atom alloys correlate more strongly with the dopant’s p-band center than with the d-band center." @default.
- W3085238411 created "2020-09-21" @default.
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- W3085238411 date "2020-09-21" @default.
- W3085238411 modified "2023-10-15" @default.
- W3085238411 title "When more is less: Nonmonotonic trends in adsorption on clusters in alloy surfaces" @default.
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- W3085238411 doi "https://doi.org/10.1063/5.0022076" @default.
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