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          Institute: Fritz-Haber-Institut     Collection: Inorganic Chemistry     Display Documents

ID: 493696.0, Fritz-Haber-Institut / Inorganic Chemistry
The influence of the nanostructure on the effect of CO2 on the properties of Pd–Ag thin-film for H2 separation
Authors:Abate, Salvatore; Centi, Gabriele; Perathoner, Siglinda; Su, Dang Sheng; Weinberg, Gisela
Date of Publication (YYYY-MM-DD):2011-01-04
Title of Journal:Applied Catalysis A: General
Journal Abbrev.:Appl. Catal. A: General
Issue / Number:1-2
Start Page:158
End Page:168
Copyright:© 2010 Published by Elsevier B.V.
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:The use of co-deposition instead of sequential deposition during the preparation of Pd-Ag thin films by electroless plating deposition leads to two different nanostructures, e.g. a dendritic nanostructure or a more compact and dense film, allowing to analyze the role of this parameter, at equal membrane composition, on the performances. In pure H2the permeability to hydrogen of the second type of thin films is 3-4 times higher, but the presence of CO2 in the feed changes considerably the performances. The results are tentatively interpreted on the basis of a non-permanent in-situ modification of the characteristics of the Pd-Ag thin films, with creation of strains and microholes particularly enhanced for the nanostructure present in the sample prepared by co-deposition. These strains and microholes are suggested to derive from the combined effect of CO2 (with creation of subsurface O and/or C) and of hydrogen diffusion through the thin film, which induces lattice expansion and stress on the nanograins. When the flux of H2 stops, there is a relatively rapid restoring of the initial situation. SEM characterization after the tests in the presence of CO2 indicates the presence of desintering consistently with above indications and the creation of crack-like voids.
Free Keywords:palladium, thin films, Pd-Ag membrane, H2 separation, nanostructure, CO2
Research Context: Pd-Ag
External Publication Status:published
Document Type:Article
Communicated by:Robert Schlögl
Affiliations:Fritz-Haber-Institut/Inorganic Chemistry/Micro- and Nanostructure / Carbon
External Affiliations:Dipartimento di Chimica Industriale ed Ingegneria dei Materiali (INSTM – UdR Messina and ELCASS), University of Messina (Italy).
Identifiers:URL:http://dx.doi.org/10.1016/j.apcata.2010.08.005 [only for subscriber]
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