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Surface characterization of Pd/Ag23 wt% membranes after different thermal treatments by A. Ramachandran; W.M. Tucho; A.L. Mejdell; M. Stange; H.J. Venvik; J.C. Walmsley; R. Holmestad; R. Bredesen; A. Borg is a Materials Science article available to read on EtoBox.

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Hydrogen permeation measurements of 1.5-10 m thick Pd/Ag23 wt% membranes before and after thermal treatments at 300 • C in air (both sides) or in the temperature range 300-450 • C in N 2 (feed side) and Ar (permeate side) were performed. Accompanying changes in surface topography and chemical composition were subsequently investigated by atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES) depth profiling. For a 2 m thick membrane, the surface roughness increased for all annealing temperatures applied, while a temperature of 450 • C was required for an increase in roughness of both membrane surfaces to occur for the 5 m membrane. The thickest membrane, of 10 m, showed changed surface roughness on one side of the membrane only and a slight decrease in hydrogen permeance after all heat treatments in N 2 /Ar. X-ray photoelectron spectroscopy investigations performed after treatment and subsequent permeation measurements revealed segregation of silver to the membrane surfaces for all annealing temperatures applied. In comparison, heat treatment at 300 • C in air resulted in significantly increased hydrogen permeance accompanied by

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Author

A. Ramachandran; W.M. Tucho; A.L. Mejdell; M. Stange; H.J. Venvik; J.C. Walmsley; R. Holmestad; R. Bredesen; A. Borg

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0169-4332)

Published

2010

Language

EN

Field

Materials Science (Physical Sciences)