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CO Adsorption on Co(0001)-Supported Pt Overlayers
LMSPC, ECPM, Université Louis Pasteur, 25 rue Becquerel, 67087 Strasbourg, France
Departamento de fisica, Universidad Nacional del Sur, Avenida Alem 1253, Bahia Blanca, Argentina
* Author to whom correspondence should be addressed.
Received: 26 September 2001; Accepted: 4 October 2001 / Published: 13 November 2001
Abstract: The growth of Pt deposits on Co(0001) was followed by STM and XPS. The chemical reactivity of the resulting surface was checked by CO adsorption. Pt grows as dendritic islands on the Co terraces whereas forming stripes at the Co step edges. Annealing the sample has no apparent effect on the STM pictures. However, XPS suggests that a limited dilution of Pt in Co takes place. The adsorption of CO on the surface is drastically affected by the presence of Pt even for minute traces. The adsorption energy on the Pt areas is decreased by 40 %. The maximum coverage on the Co areas is also decreased. This indicates that Pt impurities diluted in Co have a high passivating power as a consequence of the induced electronic changes.
Keywords: adsorption; CO; Pt; Co; thin films
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Légaré, P.; Madani, B.; Cabeza, G.F.; Castellani, N.J. CO Adsorption on Co(0001)-Supported Pt Overlayers. Int. J. Mol. Sci. 2001, 2, 246-250.
Légaré P, Madani B, Cabeza GF, Castellani NJ. CO Adsorption on Co(0001)-Supported Pt Overlayers. International Journal of Molecular Sciences. 2001; 2(5):246-250.
Légaré, P.; Madani, B.; Cabeza, G. F.; Castellani, N. J. 2001. "CO Adsorption on Co(0001)-Supported Pt Overlayers." Int. J. Mol. Sci. 2, no. 5: 246-250.