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Isotope Effect of Hot Electrons Generated on Pt Nanoparticle Surfaces Under H2 and D2 Oxidation

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Abstract

Hot electrons are generated when an exothermic chemical reaction takes place on the surface of a metal catalyst. Detection of these electrons using a catalytic nanodiode based on a metal-semiconductor Schottky junction can shed light on the mechanisms for energy transfer between the reacting molecules and the catalyst. Here, we present a study on the isotope effect of hot electron generation during the catalytic water formation reaction on platinum nanoparticles. To elucidate the isotope effect of hot electrons and to distinguish the reaction steps responsible for the creation of hot electrons, we carried out H2 and D2 oxidation reactions. We also considered the dependence of hot electron flux across the nanodiode on the temperature and geometry of the catalyst. Based on these results, we conclude that the observed effect of hot electron creation is mainly associated with energy released during the surface reaction of adsorbed hydrogen atoms and hydroxyl radicals, i.e. \({\text{H}}+{\text{OH}} \to {{\text{H}}_2}{\text{O,}}\) at high gas pressure.

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Acknowledgements

This work was supported by the Institute for Basic Science (IBS) [IBS-R004].

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Authors and Affiliations

  1. Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS), Daejeon, 34141, Republic of Korea

    Hyosun Lee, Ievgen I. Nedrygailov, Si Woo Lee & Jeong Young Park

  2. Graduate School of EEWS, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea

    Hyosun Lee, Si Woo Lee & Jeong Young Park

Authors
  1. Hyosun Lee
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  2. Ievgen I. Nedrygailov
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  3. Si Woo Lee
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  4. Jeong Young Park
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Correspondence to Jeong Young Park.

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Lee, H., Nedrygailov, I.I., Lee, S.W. et al. Isotope Effect of Hot Electrons Generated on Pt Nanoparticle Surfaces Under H2 and D2 Oxidation. Top Catal 61, 915–922 (2018). https://doi.org/10.1007/s11244-018-0947-9

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  • DOI: https://doi.org/10.1007/s11244-018-0947-9

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