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How oxygen passivates polycrystalline nickel surfaces.

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Oxygen exposure passivates polycrystalline nickel surfaces against hydrogen uptake. This passivation effect, crucial for material science, can be explained by a simple site-blocking model, simplifying complex surface interactions.

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Area of Science:

  • Surface Science
  • Materials Chemistry
  • Physical Chemistry

Background:

  • Hydrogen uptake in metals like nickel is critical for catalysis and material degradation.
  • Polycrystalline nickel surfaces present complex adsorption sites.
  • Understanding surface passivation is key to controlling material properties.

Purpose of the Study:

  • To investigate the passivation effect of oxygen on hydrogen uptake on polycrystalline nickel surfaces.
  • To quantify the influence of oxygen exposure on hydrogen adsorption.
  • To determine the applicability of surface interaction models to this system.

Main Methods:

  • Low Energy Ion Scattering (LEIS) for surface composition analysis.
  • Direct Recoil Spectroscopy (DRS) for chemical state identification.
  • Thermal Desorption Spectroscopy (TDS) for hydrogen uptake and activation energy measurements.

Main Results:

  • Oxygen exposure significantly reduces hydrogen adsorption on nickel surfaces.
  • Surface composition analysis confirmed oxygen's presence and its effect on hydrogen binding.
  • Hydrogen uptake and activation energies were quantified on oxygen-precovered surfaces.
  • Experimental results align with predictions from a simple site-blocking model.

Conclusions:

  • Oxygen effectively passivates polycrystalline nickel against hydrogen uptake.
  • A simple site-blocking model adequately describes the observed passivation phenomenon.
  • This finding simplifies the understanding of hydrogen-metal interactions in the presence of oxygen.