Journalartikel

Jahr der Veröffentlichung: 2007

Seiten: 399-407

Zeitschrift: Topics in Catalysis

Bandnummer: 44

Heftnummer: 3

ISSN: 1022-5528

eISSN: 1572-9028

DOI Link: https://doi.org/10.1007/s11244-006-0132-4

Verlag: Springer

Abstract: 
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.

Harvard-Zitierstil: Janek, J., Luerßen, B., Mutoro, E., Fischer, H. and Günther, S. (2007) In situ imaging of electrode processes on solid electrolytes by photoelectron microscopy and microspectroscopy – the role of the three-phase boundary, Topics in Catalysis, 44(3), pp. 399-407. https://doi.org/10.1007/s11244-006-0132-4

APA-Zitierstil: Janek, J., Luerßen, B., Mutoro, E., Fischer, H., & Günther, S. (2007). In situ imaging of electrode processes on solid electrolytes by photoelectron microscopy and microspectroscopy – the role of the three-phase boundary. Topics in Catalysis. 44(3), 399-407. https://doi.org/10.1007/s11244-006-0132-4