Atomic‐Scale Evidence for an Enhanced Catalytic Reactivity of Stretched Surfaces

Abstract

CommunicationsNO molecules adsorbed on an Ru surface dissociate preferentially at edge dislocations. This long-discussed effect was demonstrated with the aid of scanning tunneling microscope images which show a higher concentration of nitrogen molecules near such defects. For more information see the communication by M. Mavrikakis and J. Wintterlin et al. on the following pages.

“Stretching” the energy landscape of oxides—Effects on electrocatalysis and diffusion

“…Wintterlin et al 22 provided the fi rst experimental demonstration of the effect of strain fi eld around an edge dislocation intersecting the metal surface on the local reactivity. Real catalysts are expected to have extended defects such as dislocations associated with elastic strain fi elds.…”

Functionalities of Non-Bonding Electrons: Size Emergence

“…found preferential oxygen and carbon monoxide adsorption on the stretched regions obtained through subsurface argon implantation on Ru(0001). Wintterlin et al [43] measured an enhanced NO dissociation probability at the local expanded areas of the Ru(0001) dislocations. In the case of a supported nanoparticle catalyst, adsorption on small clusters can induce a considerable stress in the surface region [44].…”

Recent Developments in the Electrocatalysis of the O2Reduction Reaction

“…Previous studies have shown that surfaces that bind an adsorbate strongly tend to enhance the kinetics of bond scission steps in which the adsorbate is a product. On the other hand, surfaces that bind an adsorbate weakly tend to facilitate the kinetics of bond formation steps in which the adsorbate is a reactant [Mavrikakis et al, 1998;Wintterlin et al, 2003;Xu et al, 2004]. Not surprisingly, E a for O 2 dissociation is smallest on Pt ML /Au(111) and largest on Pt ML /Ir(111).…”