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Reversible shape changes of Pd nanoparticles on MgO(100).

Philipp Nolte1, Andreas Stierle, Nikolai Kasper

  • 1Max-Planck-Institut für Metallforschung, 70569 Stuttgart, Germany.

Nano Letters
|October 15, 2011
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Summary

Oxygen exposure induces reversible changes in palladium nanoparticle shape, forming nanosized (112) facets. This microscopic evolution is crucial for understanding nanoparticle catalytic reactions.

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Area of Science:

  • Materials Science
  • Surface Science
  • Nanotechnology

Background:

  • Palladium nanoparticles are vital catalysts.
  • Understanding nanoparticle shape evolution under reaction conditions is key to optimizing catalytic performance.
  • The interaction of metal nanoparticles with reactive gases influences their structure and reactivity.

Purpose of the Study:

  • To investigate the effect of oxygen on the shape of MgO(100) supported Pd nanoparticles.
  • To understand the microscopic evolution of nanoparticle facets under reactant exposure.
  • To determine the reversibility of oxygen-induced structural changes.

Main Methods:

  • High-resolution X-ray reciprocal space mapping was used to analyze nanoparticle structure.
  • Quantitative analysis of diffraction rod intensities provided information on average particle shape.
  • Experiments were conducted at specific oxygen pressures (10⁻⁵ mbar) and temperatures (570 K).

Main Results:

  • Oxygen exposure induced the formation of nanosized (112) facets on Pd nanoparticles.
  • The observed structural changes were found to be reversible upon introduction of a CO atmosphere.
  • Direct evidence for the dynamic, microscopic evolution of nanoparticle shape under reactant exposure was obtained.

Conclusions:

  • The study provides atomistic insights into nanoparticle shape changes during catalytic reactions.
  • The reversible formation of (112) facets highlights the dynamic nature of nanoparticle surfaces in reactive environments.
  • This understanding is essential for designing and improving heterogeneous catalysts.