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Pd as a promoter to reduce Co cluster films at room temperature
- Source :
- INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, Artículos CONICYT, CONICYT Chile, instacron:CONICYT
- Publication Year :
- 2010
- Publisher :
- Elsevier BV, 2010.
-
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 °C, and 500 °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.
- Subjects :
- Hydrogen
Renewable Energy, Sustainability and the Environment
Inorganic chemistry
Analytical chemistry
Oxide
Energy Engineering and Power Technology
chemistry.chemical_element
Condensed Matter Physics
Catalysis
Hydrogen storage
chemistry.chemical_compound
Fuel Technology
chemistry
Desorption
Thin film
Cobalt
Palladium
Subjects
Details
- ISSN :
- 03603199
- Volume :
- 35
- Database :
- OpenAIRE
- Journal :
- International Journal of Hydrogen Energy
- Accession number :
- edsair.doi.dedup.....c37daa38b90634581d4ff28c051ccde6