DICP OpenIR
Subject Area物理化学
On alloying and low-temperature stability of thin, supported PdAg membranes
Zeng, Gaofeng; Goldbach, Andreas; Shi, Lei; Xu, Hengyong; 哥德巴赫; Xu HY(徐恒泳)
KeywordPdag Membrane Alloy Formation Activation Energy Of H-2 Permeation Temperature Cycling Defect Formation
Source PublicationINTERNATIONAL JOURNAL OF HYDROGEN ENERGY
2012-04-01
DOI10.1016/j.ijhydene.2011.12.126
Volume37Issue:7Pages:6012-6019
Indexed BySCI
SubtypeArticle
DepartmentDNL19
Funding ProjectDNL1902
Contribution Rank1,1
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
WOS SubjectChemistry, Physical ; Electrochemistry ; Energy & Fuels
WOS Research AreaChemistry ; Electrochemistry ; Energy & Fuels
WOS KeywordHYDROGEN PERMEATION ; AG MEMBRANES ; PALLADIUM ; PERMEABILITY ; ELECTROLESS ; SEPARATION ; REACTORS ; PHASE
AbstractElectroless plating is the technically most facile and most frequently studied method for preparation of PdAg/ceramic composite membranes. Limited high-temperature stability of such membranes requires alloying of sequentially deposited Pd and Ag layers far below their melting points, however. Here it is demonstrated that 600-800 h are needed for forming 2-4 mu m thick, homogeneous alloy layers from Pd Ag bilayers at 823 K under atmospheric H-2 pressure. This is also the time scale on which the activation energy for H-2 permeation becomes stable so that this characteristic can be employed for non-destructive, in-process monitoring of the alloying progress. High-temperature H-2 permeation rates are shown to be less well suited for this purpose because they are not sufficiently sensitive to the homogeneity of PdAg membranes. The activation energies for the well-alloyed membranes indicate that diffusion through the bulk of the PdAg layer limits H-2 permeation through these composite membranes. It is further shown that a fully alloyed Pd75Ag25 membrane tolerates temperature cycling under H-2 well down to 373 K while H-2/N-2 exchanges at that temperature trigger a rapid growth of the N-2 leak rate of that membrane. The defect formation is attributed to mechanical stress caused by the substantial expansion and shrinking of the alloy lattice during hydriding and dehydriding at low temperatures. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
Language英语
WOS IDWOS:000303284000059
Citation statistics
Cited Times:23[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/117877
Collection中国科学院大连化学物理研究所
Corresponding Author哥德巴赫; Xu HY(徐恒泳)
AffiliationChinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
Recommended Citation
GB/T 7714
Zeng, Gaofeng,Goldbach, Andreas,Shi, Lei,et al. On alloying and low-temperature stability of thin, supported PdAg membranes[J]. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY,2012,37(7):6012-6019.
APA Zeng, Gaofeng,Goldbach, Andreas,Shi, Lei,Xu, Hengyong,哥德巴赫,&徐恒泳.(2012).On alloying and low-temperature stability of thin, supported PdAg membranes.INTERNATIONAL JOURNAL OF HYDROGEN ENERGY,37(7),6012-6019.
MLA Zeng, Gaofeng,et al."On alloying and low-temperature stability of thin, supported PdAg membranes".INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 37.7(2012):6012-6019.
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