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Catalytic Scavenging of Plant Reactive Oxygen Species In Vivo by Anionic Cerium Oxide Nanoparticles
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Defect Dynamics at a Single Pt Nanoparticle during Catalytic Oxidation.

Dongjin Kim1, Myungwoo Chung1, Sungwon Kim1

  • 1Department of Physics , Sogang University , Seoul 04107 , Korea.

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|June 29, 2019
PubMed
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Defects in platinum (Pt) nanoparticle catalysts influence methane oxidation. Strain at defect sites drives further changes and loss of catalytic activity during reactions.

Keywords:
3D strain imagingBragg coherent diffraction imagingcatalystplatinum nanoparticlestrain dynamics

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Defects significantly impact material properties, including electronic behavior and chemical reactivity.
  • In heterogeneous catalysis, defect sites are crucial for reactant adsorption and active species formation.
  • Controlling defects in nanoparticle catalysts offers a pathway to enhance catalytic performance.

Purpose of the Study:

  • To investigate the in situ structural response and defect evolution in individual platinum nanoparticle catalysts during methane oxidation.
  • To understand how catalytic reactions induce deformation at defect sites within nanocrystals.

Main Methods:

  • Bragg coherent X-ray diffraction imaging was employed to observe defect dynamics in a single platinum nanoparticle.
  • In situ monitoring of the nanoparticle during catalytic methane oxidation reactions.

Main Results:

  • Initially tensile strained regions within the platinum nanoparticle served as initiation points for increased strain.
  • Oxidation reactions led to the development of further strain and subsequent loss of diffraction density at these sites.
  • The observed deformation and its reversibility during catalytic cycles provide insights into defect behavior.

Conclusions:

  • Catalytically induced deformation at defect sites is a key factor in nanoparticle catalyst behavior.
  • Understanding and engineering these defect dynamics can lead to improved heterogeneous catalysts.
  • The study highlights the potential of in situ X-ray diffraction imaging for characterizing nanoscale catalytic processes.