Hydrogen storage properties of the mechanically milled MgH2-V nanocomposite

被引：307

作者：

Liang, G ^{[1
]}

Huot, J

Boily, S

Van Neste, A

Schulz, R

机构：

[1] Univ Laval, Dept Mines & Met, Quebec City, PQ G1K 7P4, Canada

[2] Inst Rech Hydro Quebec, Varennes, PQ J3X 1S, Canada

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 1999年 / 291卷 / 1-2期

关键词：

mechanical milling; hydrogen storage alloy; MgH2-V nanocomposite;

D O I：

10.1016/S0925-8388(99)00268-6

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：

In this paper we present the hydrogen storage properties of a new composite MgH2 +V prepared by ball milling. Intensive milling of magnesium hydride with vanadium produces a nanocomposite of beta-MgH2+gamma-MgH2 +VH0.81. The MgH2+5 at.% V composite produced by mechanical milling can desorb hydrogen at 473 K under vacuum and re-absorb hydrogen rapidly even at room temperature. The activation energy of hydrogen desorption was measured to be 62 kJ mol(-1) H-2. The fast kinetics of the ball milled MgH2-V composite primarily comes from the catalytic effect of vanadium and the small powder size. The formation enthalpy and entropy of the composite are identical to that of pure magnesium. (C) 1999 Elsevier Science S.A. All rights reserved.

引用

页码：295 / 299

页数：5

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