Nanoscale composition modulations in MgyTi1-yHx thin film alloys for hydrogen storage

被引：55

作者：

Baldi, A. ^{[1
]}

Gremaud, R. ^{[1
]}

Borsa, D. M. ^{[1
]}

Balde, C. P. ^{[2
]}

van der Eerden, A. M. J. ^{[2
]}

Kruijtzer, G. L. ^{[3
]}

de Jongh, P. E. ^{[2
]}

Dam, B. ^{[1
]}

Griessen, R. ^{[1
]}

机构：

[1] Vrije Univ Amsterdam, Dept Phys & Astron, NL-1081 HV Amsterdam, Netherlands

[2] Univ Utrecht, Dept Chem, NL-3584 CA Utrecht, Netherlands

[3] Univ Utrecht, Debye Inst NanoMat Sci, NL-3508 TA Utrecht, Netherlands

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2009年 / 34卷 / 03期

关键词：

Hydrogen storage; Immiscible alloys; Chemical short-range order; SOLID-SOLUTIONS; METAL-HYDRIDES; TI; MAGNESIUM;

D O I：

10.1016/j.ijhydene.2008.11.090

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：

A detailed structural analysis of Mg-Ti-H thin films reveals the presence of a chemically partially segregated but structurally coherent metastable phase. By combining X-Ray Diffraction and Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy on MgyTi1-yHx thin films we find non-zero Chemical Short-Range Order (CSRO) parameters for all the compositions measured. Despite the positive enthalpy of mixing of Mg and Ti the degree of ordering does not increase upon loading and unloading with hydrogen. The robustness of this system and the fast and reversible kinetics of hydrogen loading and unloading are caused by the formation of nanoscale compositional modulations in the intermetallic alloy. This microstructure is responsible for the exceptional properties of MgyTi1-yHx, thin films. It also shows that reversible metastable metal-hydrides offer new possibilities for hydrogen storage, beyond the limits imposed by thermodynamic equilibrium. (C) 2008 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.

引用

页码：1450 / 1457

页数：8

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