Hydrogen sorption mechanism of oxidized nickel clusters

Borgschulte, A.; Westerwaal, R. J.; Rector, J. H.; Dam, B.; Griessen, R.
November 2004
Applied Physics Letters;11/22/2004, Vol. 85 Issue 21, p4884
Academic Journal
Using an optical technique to measure hydrogen sorption kinetics the catalytic activity of the NiOx clusters is determined. The thus measured temperature dependence reveals an activation energy of 0.58 eV. The catalytic activity of NiOx clusters is studied as a function of the oxygen concentration. The surface properties are analyzed by Auger-electron spectroscopy. It appears that the catalytic hydrogen sorption originates from the dissociative chemisorption of hydrogen on O:Ni, which is strongly suppressed by the presence of oxides.


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