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Title: Pd as a promoter to reduce Co cluster films at room temperature
Authors: Romero Vieyra, Christian ×
Avila, J. I
Trabol, R. A
Wang, Huan
Vantomme, André
Van Bael, Margriet
Lievens, Peter
Cabrera, A. L #
Issue Date: Mar-2010
Publisher: Pergamon-elsevier science ltd
Series Title: International journal of hydrogen energy vol:35 issue:6 pages:2262-2267
Abstract: The optical and resistivity properties of Pd/Co films are investigated and related to the interaction of palladium and the underlying cobalt (Co) clusters layer when exposed to hydrogen. Co is used because it is known to absorb hydrogen only on its surface. Co clusters with mean size of 1.8 nm in the gas phase were deposited on sapphire substrates at room temperature (RT), 300 degrees C, and 500 degrees C respectively, and capped by a continuous Pd film. Light transmission and reflection in the visible range were measured during hydrogen exposure at different pressures in consecutive cycles. An unusual change in the transmittance and the resistance during the first hydrogenation cycle of a sample suggests that a reduction of the surface oxide on the Co clusters layer occurs at room temperature. The reduction of the native oxide on Co thin films or bulk does not happen without the Pd capping when exposed to hydrogen under similar conditions. (C) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.
URI: 
ISSN: 0360-3199
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Solid State Physics and Magnetism Section
Nuclear and Radiation Physics Section
× corresponding author
# (joint) last author

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