Hydrogen absorption and hydrogen-induced reverse segregation in palladium-silver surface

被引：34

作者：

Padama, Allan Abraham B. ^{[1
]}

Kasai, Hideaki ^{[1
,2
]}

Budhi, Yogi Wibisono ^{[3
]}

机构：

[1] Osaka Univ, Dept Appl Phys, Suita, Osaka 5650871, Japan

[2] Osaka Univ, Ctr Atom & Mol Technol, Suita, Osaka 5650871, Japan

[3] Inst Teknol Bandung, Fac Ind Technol, Dept Chem Engn, Bandung 40132, Indonesia

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2013年 / 38卷 / 34期

关键词：

Palladium-silver surface; Hydrogen absorption; Density functional theory; Induced reverse segregation; TOTAL-ENERGY CALCULATIONS; PD-AG MEMBRANES; AB-INITIO; H-2; PERMEABILITY; ATOM ADSORPTION; PERMEATION; DIFFUSION; ALLOYS;

D O I：

10.1016/j.ijhydene.2013.08.138

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Hydrogen absorption from surface to second subsurface layer of ordered and substitutionally disordered Pd3Ag(110) was investigated by performing density functional theory-based calculations. Ag segregation to topmost layer was found to be energetically favored for clean surface structure. The absorption of H in the alloy surface, for both ordered and substitutionally disordered structures, is generally characterized by lower activation barrier as compared to pure Pd surface. When H is present in the surface or subsurface regions, our results strongly suggest the tendency of subsurface Pd atoms to segregate to the surface or near surface region. The reverse segregation of Pd, along with the large lattice constant and the modified electronic structure of Pd atoms in Pd3Ag alloy could help in understanding the experimentally determined high hydrogen permeability of PdAg membranes. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

引用

页码：14715 / 14724

页数：10

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