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学科主题: 物理化学
题名: On alloying and low-temperature stability of thin, supported PdAg membranes
作者: Zeng, Gaofeng1;  Goldbach, Andreas1;  Shi, Lei1;  Xu, Hengyong1
通讯作者: 哥德巴赫 ;  徐恒泳
关键词: PdAg membrane ;  Alloy formation ;  Activation energy of H-2 permeation ;  Temperature cycling ;  Defect formation
刊名: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
发表日期: 2012-04-01
DOI: 10.1016/j.ijhydene.2011.12.126
卷: 37, 期:7, 页:6012-6019
收录类别: SCI
文章类型: Article
部门归属: DNL19
项目归属: DNL1902
产权排名: 1,1
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Electrochemistry ;  Energy & Fuels
研究领域[WOS]: Chemistry ;  Electrochemistry ;  Energy & Fuels
英文摘要: Electroless 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.
关键词[WOS]: HYDROGEN PERMEATION ;  AG MEMBRANES ;  PALLADIUM ;  PERMEABILITY ;  ELECTROLESS ;  SEPARATION ;  REACTORS ;  PHASE
语种: 英语
WOS记录号: WOS:000303284000059
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/117877
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China

Recommended Citation:
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.
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