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学科主题物理化学
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)
关键词Pdag Membrane Alloy Formation Activation Energy Of H-2 Permeation Temperature Cycling Defect Formation
刊名INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
2012-04-01
DOI10.1016/j.ijhydene.2011.12.126
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
关键词[WOS]HYDROGEN PERMEATION ; AG MEMBRANES ; PALLADIUM ; PERMEABILITY ; ELECTROLESS ; SEPARATION ; REACTORS ; PHASE
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.
语种英语
WOS记录号WOS:000303284000059
引用统计
被引频次:21[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/117877
专题中国科学院大连化学物理研究所
通讯作者哥德巴赫; Xu HY(徐恒泳)
作者单位Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
推荐引用方式
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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