On alloying and low-temperature stability of thin, supported PdAg membranes

	On alloying and low-temperature stability of thin, supported PdAg membranes
	Zeng, Gaofeng; Goldbach, Andreas; Shi, Lei; Xu, Hengyong
刊名	international journal of hydrogen energy
	2012-04-01
卷号	37 期号:7 页码:6012-6019
关键词	PdAg membrane Alloy formation Activation energy of H-2 permeation Temperature cycling Defect formation
通讯作者	哥德巴赫 ; 徐恒泳
产权排序	1,1
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.
学科主题	物理化学
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
收录类别	SCI
语种	英语
WOS记录号	WOS:000303284000059
公开日期	2013-10-11
内容类型	期刊论文
源URL	[http://159.226.238.44/handle/321008/117877]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
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.(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.