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Keywords:

  • alloys;
  • palladium;
  • gold;
  • nanoparticles
Thumbnail image of graphical abstract

Palladium-ringed gold: The acid-pretreated Au–Pd catalysts supported on TiO2 have a well-defined gold-rich core (blue) and palladium-rich shell (green). This type of core and shell enhances the catalytic activity of the catalyst for the direct synthesis of H2O2 from H2 and O2.