XPS Study of the Segregation of Minor Elements at the Surface of a Commercial Copper10 wt. Nickel Alloy

Danoix‐Souchet, R.; D'huysser, A.

doi:10.1002/(sici)1096-9918(199709)25:10<747::aid-sia296>3.3.co;2-6

Cited by 1 publication

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is well known that the surface segregation of impurities in metals depends on the oxygen activity at the surface [57,58]. Upon electrochemical polarisation the oxygen activity is changed at the tpb and from there it changes along the surface via the mobile spillover species.…”

Section: Spem For the Characterisation Of Spillover Speciesmentioning

confidence: 99%

In situ imaging of electrode processes on solid electrolytes by photoelectron microscopy and microspectroscopy – the role of the three-phase boundary

et al. 2007

View full text Add to dashboard Cite

The electrochemical polarisation of metal catalyst films on solid electrolyte substrates can basically lead to three different effects: (a) the generation of mobile surface species (spillover) which spread over the catalyst surface and modify the catalytic activity, (b) potential-controlled segregation of impurities in the catalyst and (c) potential-dependent surface energy (electrocapillarity). The generation of spillover species occurs at the three-phase boundary between metal, solid electrolyte and gas phase and is highly localized. The spreading occurs via diffusion and leads to time-dependent and inhomogeneous surface concentrations. The kinetics of the spillover process can only be observed with in situ surface-analytical techniques in combination with electrochemical methods which offer sufficient resolution in space and time. Model experiments with UV and X-ray photoelectron emission microscopy (PEEM and SPEM) are summarized and discussed with respect to their relevance for the better understanding of electrochemical promotion in catalysis.

show abstract

Section: Spem For the Characterisation Of Spillover Speciesmentioning

confidence: 99%