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Characterization of Pd-Cu membranes fabricated by surfactant induced electroless plating (SIEP) for hydrogen separation

M.S. Islam; M.M. Rahman; S. Ilias

(Profiled Author: Shamsuddin Ilias)

International Journal of Hydrogen Energy. 2012;37(4):3477-3490.

Abstract

Pd-Cu composite membranes on microporous stainless steel (MPSS) substrate were fabricated using surfactant induced electroless plating (SIEP). In the SIEP method, dodecyl trimethyl ammonium bromide (DTAB), a cationic surfactant, was used in Pd- and Cu-baths for the sequential deposition of metals on MPSS substrates. The SIEP Pd-Cu membrane performance was compared with membranes fabricated by conventional electroless plating (CEP). The pre- and post-annealing characterizations of these membranes were carried out by SEM, XRD, EDX and AFM studies. The SEM images showed a significant improvement of the membrane surface morphology, in terms of metal grain structures and grain agglomeration compared to the CEP membranes. The SEM images and helium gas-tightness studies indicated that dense and thinner films of Pd-Cu can be produced with shorter deposition time using SIEP method. From XRD, cross-sectional SEM and EDS studies, alloying of Pd-Cu was confirmed at an annealing temperature of 773 K under hydrogen environment. These membranes were also studied for H2 perm-selectivity as a function of temperature and feed pressure. SIEP membranes had significantly higher H2 perm-selectivity compared to CEP membranes. Under thermal cycling (573 K - 873 K - 573 K), the SIEP Pd-Cu membrane was stable and retained hydrogen permeation characteristics for over three months of operation. © 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

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