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题名: Real-time monitoring of metal deposition and segregation phenomena during preparation of PdCu membranes
作者: Yuan, Lixiang1;  Goldbach, Andreas1;  Xu, Hengyrong1
通讯作者: 哥德巴赫
关键词: PdCu membrane ;  H(2) permeation ;  segregation ;  gas evolution ;  electroless plating
刊名: JOURNAL OF MEMBRANE SCIENCE
发表日期: 2008-09-01
DOI: 10.1016/j.memsci.2008.04.067
卷: 322, 期:1, 页:39-45
收录类别: SCI
文章类型: Article
部门归属: 8
项目归属: 801
产权排名: 1;1
WOS标题词: Science & Technology ;  Technology ;  Physical Sciences
类目[WOS]: Engineering, Chemical ;  Polymer Science
研究领域[WOS]: Engineering ;  Polymer Science
英文摘要: The N(2) and H(2) evolution, respectively, were monitored during deposition of Pd and Cu from electroless plating baths to obtain in-process control of the composition during preparation of 3-7 mu m thick PdCu membranes on tubular ceramic substrates. Compositions estimated by gas evolution compare favorably to those measured in post-mortem XRD and EDS analyses, mostly differing by not more than 1 at.%. This result suggests that use of gas evolution measurements to enable in-process control of composition to within 1 at.% is feasible. Annealing experiments in an H(2) atmosphere demonstrated that, at 893 K. only 48 h are needed to form a stoichiometrically homogeneous, 9.5 mu m thick, face centered cubic (fcc) Pd(63)Cu(37) membrane from sequentially deposited layers; at 723 K, the same transformation requires over 2 weeks. The appearance of transient body centered cubic (bcc) and fcc phases with lower Pd contents signaled compositional segregation in the initial stages of alloy formation at 723 and 773 K and could be a source of persistent stoichiometric heterogeneity particularly in bcc PdCu membranes. The H(2) fluxes of fcc Pd(58)Cu(42) and Pd(70)Cu(30) membranes were J(H2) = (1.6 +/- 1.1) mol m(-2) s(-1) exp[(-24.8 +/- 0.4)kJ mol(-1) /RT] and J(H2) = (3.7 +/- 0.6) mol m(-2) s(-1) exp[(-21.3 +/- 1.0)kJ mol(-1)/RT], respectively, at 100 kPa H(2) pressure difference. (c) 2008 Elsevier B.V. All rights reserved.
关键词[WOS]: POROUS STAINLESS-STEEL ;  COMPOSITE MEMBRANES ;  HYDROGEN ;  SEPARATION ;  DIFFUSION ;  TRANSPORT ;  H-2
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000259014400006
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/100565
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, Lab Appl Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Yuan, Lixiang,Goldbach, Andreas,Xu, Hengyrong. Real-time monitoring of metal deposition and segregation phenomena during preparation of PdCu membranes[J]. JOURNAL OF MEMBRANE SCIENCE,2008,322(1):39-45.
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