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学科主题: 物理化学
题名: Structural and Permeation Kinetic Correlations in PdCuAg Membranes
作者: Zhao, Lingfang1;  Goldbach, Andreas1;  Bao, Chun1;  Xu, Hengyong1
通讯作者: 哥德巴赫
关键词: hydrogen separation ;  ternary alloy ;  Vegard's law ;  kinetic compensation ;  structure-function ;  relationship
刊名: ACS APPLIED MATERIALS & INTERFACES
发表日期: 2014-12-24
DOI: 10.1021/am506439x
卷: 6, 期:24, 页:22408-22416
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Technology
类目[WOS]: Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary
研究领域[WOS]: Science & Technology - Other Topics ;  Materials Science
英文摘要: Addition of Ag is a promising way to enhance the H-2 permeability of sulfur-tolerant PdCu membranes for cleanup of coal-derived hydrogen. We investigated a series of PdCuAg membranes with at least 70 atom % Pd to elucidate the interdependence between alloy structure and H-2 permeability. Membranes were prepared via sequential electroless plating of Pd, Ag, and Cu onto ceramic microfiltration membranes and subsequent alloying at elevated temperatures. Alloy formation was complicated by a wide miscibility gap in the PdCuAg phase diagram at the practically feasible operation temperatures. X-ray diffraction showed that the lattice constants of the fully alloyed ternary alloys obey Vegards law closely. In general, H-2 permeation rates increased with increasing Ag and decreasing Cu content of the membranes in the investigated temperature range. Detailed examination of the permeation kinetics revealed compensation between activation energy and pre-exponential factor of the corresponding H-2 permeation laws. The origin of this effect is discussed. Further analysis showed that the activation energy for H-2 permeation decreases overall with increasing lattice constant of the ternary alloy. The combination of these correlations results in a structurefunction relationship that will facilitate rational design of PdCuAg membranes.
关键词[WOS]: HYDROGEN SEPARATION MEMBRANES ;  LOW-TEMPERATURE H-2 ;  ALLOY MEMBRANES ;  ELEVATED-TEMPERATURES ;  MATHEMATICAL ORIGINS ;  PALLADIUM MEMBRANES ;  TERNARY ALLOY ;  PD ;  TRANSPORT ;  SOLUBILITY
语种: 英语
WOS记录号: WOS:000347139400078
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/143768
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 Natl Lab Clean Energy, Dalian 116023, Peoples R China

Recommended Citation:
Zhao, Lingfang,Goldbach, Andreas,Bao, Chun,et al. Structural and Permeation Kinetic Correlations in PdCuAg Membranes[J]. ACS APPLIED MATERIALS & INTERFACES,2014,6(24):22408-22416.
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