Journal Articles Journal of Physical Chemistry Letters Year : 2015

Critical Au Concentration for the Stabilization of Au-Cu Nanoparticles on Rutile against Dissociation under Oxygen

Yves Borensztein
Bernard Croset
  • Function : Author
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Adriana Vlad
  • Function : Author
A. Coati
Y. Garreau
  • Function : Author
Geoffroy Prévot

Abstract

Controlling aging of catalysts is of crucial importance to preserve their properties, in particular for bimetallic nanoparticles (NPs) where reaction can modify the composition. Herein, we have studied the stability upon oxygen exposure of gold copper NPs supported on rutile. We have used in situ scanning tunneling microscopy to follow the evolution of individual Au, Cu and Au-Cu NPs with various compositions grown on the TiO2(110) surface, during each step from their nucleation to their modification with oxygen. We demonstrated a direct relation between the stability of the nanoparticles and their Au concentration. Whereas pure Cu nanoparticles dissociate under O-2, Au Cu NPs containing at least 20% Au are stable. This is explained by a modification of the local density of states of Cu atoms upon alloying.
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Dates and versions

hal-01238939 , version 1 (07-12-2015)

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A. Wilson, Romain Bernard, Yves Borensztein, Bernard Croset, Hervé Cruguel, et al.. Critical Au Concentration for the Stabilization of Au-Cu Nanoparticles on Rutile against Dissociation under Oxygen. Journal of Physical Chemistry Letters, 2015, 6 (11), pp.2050-2055. ⟨10.1021/acs.jpclett.5b00791⟩. ⟨hal-01238939⟩
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