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XPS Lineshape Analysis of Potassium Coadsorbed with Water on Ni(111)

Kuch, Wolfgang and Schulze, Mathias and Schnurnberger, Werner and Bolwin, Klaus (1993) XPS Lineshape Analysis of Potassium Coadsorbed with Water on Ni(111). Surface Science (287/288), pp. 600-604. Elsevier Science Publishers B.V.. ISSN 0039-6028/93/$06.00

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Abstract

The line profiles of XP spectra of H2O/K/Ni(111) were investigated for K submonolayer coverages. The K2p spectra exhibit a strong alteration of lineshape with increasing water coverage. Without coadsorbed water a significant asymmetry was found which decreased rapidly and independently of the potassium precoverage with increasing water exposure up to ΘH2O = 0.7. The asymmetry observed in the K2p spectra is assigned to a coupling of the potassium adatoms to the electronic structure of the nickel substrate. The coadsorption of water suppresses this mechanism via a loosening of the potassium-nickel coupling. Since the decrease of asymmetry is independent of the potassium coverage, it is concluded that this process is due to an adsorbate-substrate interaction between the water and the nickel substrate only. This contradicts models in which the coadsorption of water and potassium on metal substrates is manifested in hydration of the potassium adatoms.

Item URL in elib:https://elib.dlr.de/46195/
Document Type:Article
Title:XPS Lineshape Analysis of Potassium Coadsorbed with Water on Ni(111)
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kuch, WolfgangUNSPECIFIEDUNSPECIFIED
Schulze, MathiasUNSPECIFIEDUNSPECIFIED
Schnurnberger, WernerUNSPECIFIEDUNSPECIFIED
Bolwin, KlausUNSPECIFIEDUNSPECIFIED
Date:1993
Journal or Publication Title:Surface Science
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Page Range:pp. 600-604
Publisher:Elsevier Science Publishers B.V.
Series Name:Surface Science
ISSN:0039-6028/93/$06.00
Status:Published
Keywords:Ni(111), water adsorption, potassium adsorption
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion (old)
HGF - Program Themes:E BZ - Fuel cells (old)
DLR - Research area:Energy
DLR - Program:E BZ - Fuel cells
DLR - Research theme (Project):E - Membran-Brennstoffzellen (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Schulze, Dr.rer.nat. Mathias
Deposited On:12 Dec 2006
Last Modified:27 Apr 2009 13:20

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