Adsorption of hydrogen and deuterium on potassium-promoted Pd(100) surfaces

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Abstract

The adsorption of H2 and D2 has been studied on clean and K-promoted Pd(100) surfaces using thermal desorption, work function changes, ultraviolet photoelectron and Auger spectroscopy. The potassium adlayer significantly lowers the sticking coefficient (from 0.6 to 0.06 at θk = 0.2), and the uptake of hydrogen, but increases the desorption energy for H2 desorption. Calculation showed that each potassium adatom blocks approximately 4-5 adsorption sites for H2 adsorption. Atomization of hydrogen led to an increase of hydrogen uptake. The adsorption of potassium on the H-covered surface caused a significant decrease in the amount of hydrogen adsorbed on the surface (as indicated by less desorbing hydrogen below 500 K) and promoted the dissolution of H atoms into the bulk of Pd. The dissolved hydrogen was released only above 600-650 K. In the interpetation of the results the extended charge transfer from K-dosed Pd to the adsorbed H atoms and the direct interaction between adsorbed H and K adatoms are taken into account.

Original languageEnglish
Pages (from-to)139-150
Number of pages12
JournalSurface Science
Volume260
Issue number1-3
DOIs
Publication statusPublished - Jan 1 1992

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Deuterium
Potassium
deuterium
Hydrogen
potassium
Adsorption
adsorption
hydrogen
Adatoms
desorption
adatoms
Desorption
Atoms
Thermal desorption
ultraviolet spectroscopy
atomizing
Atomization
Photoelectrons
Auger spectroscopy
atoms

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Adsorption of hydrogen and deuterium on potassium-promoted Pd(100) surfaces. / Solymosi, F.; Kovács, I.

In: Surface Science, Vol. 260, No. 1-3, 01.01.1992, p. 139-150.

Research output: Contribution to journalArticle

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N2 - The adsorption of H2 and D2 has been studied on clean and K-promoted Pd(100) surfaces using thermal desorption, work function changes, ultraviolet photoelectron and Auger spectroscopy. The potassium adlayer significantly lowers the sticking coefficient (from 0.6 to 0.06 at θk = 0.2), and the uptake of hydrogen, but increases the desorption energy for H2 desorption. Calculation showed that each potassium adatom blocks approximately 4-5 adsorption sites for H2 adsorption. Atomization of hydrogen led to an increase of hydrogen uptake. The adsorption of potassium on the H-covered surface caused a significant decrease in the amount of hydrogen adsorbed on the surface (as indicated by less desorbing hydrogen below 500 K) and promoted the dissolution of H atoms into the bulk of Pd. The dissolved hydrogen was released only above 600-650 K. In the interpetation of the results the extended charge transfer from K-dosed Pd to the adsorbed H atoms and the direct interaction between adsorbed H and K adatoms are taken into account.

AB - The adsorption of H2 and D2 has been studied on clean and K-promoted Pd(100) surfaces using thermal desorption, work function changes, ultraviolet photoelectron and Auger spectroscopy. The potassium adlayer significantly lowers the sticking coefficient (from 0.6 to 0.06 at θk = 0.2), and the uptake of hydrogen, but increases the desorption energy for H2 desorption. Calculation showed that each potassium adatom blocks approximately 4-5 adsorption sites for H2 adsorption. Atomization of hydrogen led to an increase of hydrogen uptake. The adsorption of potassium on the H-covered surface caused a significant decrease in the amount of hydrogen adsorbed on the surface (as indicated by less desorbing hydrogen below 500 K) and promoted the dissolution of H atoms into the bulk of Pd. The dissolved hydrogen was released only above 600-650 K. In the interpetation of the results the extended charge transfer from K-dosed Pd to the adsorbed H atoms and the direct interaction between adsorbed H and K adatoms are taken into account.

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