Role of additives in LiBH4-MgH2 reactive hydride composites for sorption kinetics

被引：191

作者：

Boesenberg, U. ^{[1
]}

Kim, J. W. ^{[2
]}

Gosslar, D. ^{[3
]}

Eigen, N. ^{[1
]}

Jensen, T. R. ^{[4
,5
]}

von Colbe, J. M. Bellosta ^{[1
]}

Zhou, Y. ^{[1
]}

Dahms, M. ^{[1
,6
]}

Kim, D. H. ^{[2
]}

Guenther, R. ^{[3
]}

Cho, Y. W. ^{[7
]}

Oh, K. H. ^{[2
]}

Klassen, T. ^{[8
]}

Bormann, R. ^{[1
,3
]}

Dornheim, M. ^{[1
]}

机构：

[1] GKSS Forschungszentrum Geesthacht GmbH, Inst Mat Res, D-21502 Geesthacht, Germany

[2] Seoul Natl Univ, Dept Mat Sci & Engn, Seoul 151742, South Korea

[3] Hamburg Univ Technol, Inst Mat Sci & Technol, D-21073 Hamburg, Germany

[4] Univ Aarhus, Interdisciplinary Nanosci Ctr, DK-8000 Aarhus, Denmark

[5] Univ Aarhus, Dept Chem, DK-8000 Aarhus, Denmark

[6] FH Flensburg, D-24943 Flensburg, Germany

[7] Korea Inst Sci & Technol, Seoul 136791, South Korea

[8] Helmut Schmidt Univ, Inst Mat Technol, D-22043 Hamburg, Germany

来源：

ACTA MATERIALIA | 2010年 / 58卷 / 09期

关键词：

Hydrogen storage; Nanocomposites; Heterogeneous nucleation of phase transformations; Phase transformation kinetics; HYDROGEN STORAGE; METAL-HYDRIDES; STATE; MECHANISMS;

D O I：

10.1016/j.actamat.2010.02.012

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The influence of additives on the reaction kinetics and microstructure refinement in LiBH4-MgH2 composites is investigated in detail. Indications of the rate-limiting processes during the reactions are obtained by comparison of the measured reaction kinetics with simulations with one specific rate-limiting process. The kinetics of the sorption reactions are derived from volumetric measurements as well as from in situ X-ray diffraction measurements. During desorption, the hydrogen is released at a constant rate, which is possibly correlated with the one-dimensional growth of MgB2 platelets. In contrast, the kinetic curves of the absorption reactions exhibit the typical shape of contracting-volume controlled kinetics. The microscopical interpretation of kinetic measurements are supported by transmission electron microscopy images confirming the formation of additive-nanostructures in the grain boundaries upon cycling. The present investigations underline the importance of the additives as nucleation substrates and the influence of microstructure on the reaction kinetics. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：3381 / 3389

页数：9

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