Mechanism of the high activity of Mg2NiH4 produced by hydriding combustion synthesis based on the analysis of phase composition, particle characteristic and grain size

被引：33

作者：

Liu, Dongming ^{[1
]}

Zhu, Yunfeng ^{[1
]}

Li, Liquan ^{[1
]}

机构：

[1] Nanjing Univ Technol, Coll Mat Sci & Engn, Nanjing 210009, Peoples R China

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2007年 / 32卷 / 13期

基金：

中国国家自然科学基金;

关键词：

hydrogen storage alloy; hydriding combustion synthesis; magnesium nickel; mechanism;

D O I：

10.1016/j.ijhydene.2006.09.037

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：

Hydriding combustion synthesis (HCS) is well known as an innovative processing to produce magnesium-based hydrogen storage alloys, and the product Mg2NiH4, as synthesized, possesses excellent activity without any activation process. In this paper, the mechanism of the high activity of Mg2NiH4 produced by HCS emphasized mainly on microstructure is discussed based on the analysis of phase composition, particle characteristic, crystal grain size and hydriding reaction by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) and pressure composition temperature (PCT). It is indicated that pure composition, loose and porous morphology, a large number of microfissures and small grain size are the intrinsic reasons for the high activity of Mg2NiH4 produced by the process of HCS. The result is very helpful for us to control and improve the hydrogen storage properties of HCS product based on the microstructure further. (C) 2006 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.

引用

页码：2455 / 2460

页数：6

共 17 条

[1] Structural and hydriding properties of MgYNi4:: A new intermetallic compound with C15b-type Laves phase structure [J].

Aono, K ;

Orimo, S ;

Fujii, H .

JOURNAL OF ALLOYS AND COMPOUNDS, 2000, 309 (1-2) :L1-L4

[2] Enhancement of hydrogen storage in MgNi by Pd-coating [J].

Janot, R ;

Rougier, A ;

Aymard, L ;

Lenain, C ;

Herrera-Urbina, R ;

Nazri, GA ;

Tarascon, JM .

JOURNAL OF ALLOYS AND COMPOUNDS, 2003, 356 :438-441

[3] Hydriding combustion synthesis of hydrogen storage alloys of Mg-Ni-Cu system [J].

Li, L ;

Saita, I ;

Saito, K ;

Akiyama, T .

INTERMETALLICS, 2002, 10 (10) :927-932

[4] Intermediate products during the hydriding combustion synthesis of Mg2NiH4 [J].

Li, LQ ;

Saita, I ;

Akiyama, T .

JOURNAL OF ALLOYS AND COMPOUNDS, 2004, 384 (1-2) :157-164

[5] Effects of hydrogen pressure and cooling rate on the hydriding combustion synthesis of Mg2NiH4 studied by thermogravimetry and X-ray diffraction [J].

Li, LQ ;

Akiyama, T ;

Kabutomori, T ;

Yagi, J .

MATERIALS TRANSACTIONS JIM, 1999, 40 (10) :1079-1083

[6] Hydrogen storage alloy of Mg2NiH4 hydride produced by hydriding combustion synthesis from powder of mixture metal [J].

Li, LQ ;

Akiyama, T ;

Yagi, J .

JOURNAL OF ALLOYS AND COMPOUNDS, 2000, 308 :98-103

[7] Reaction mechanism of hydriding combustion synthesis of Mg2NiH4 [J].

Li, LQ ;

Akiyama, T ;

Yagi, J .

INTERMETALLICS, 1999, 7 (06) :671-677

[8] Effect of synthesis temperature on the purity of product in hydriding combustion synthesis of Mg2NiH4 [J].

Li, LQ ;

Saita, I ;

Saito, K ;

Akiyama, T .

JOURNAL OF ALLOYS AND COMPOUNDS, 2002, 345 (1-2) :189-195

[9] Activation behaviors of Mg2NiH4 at different hydrogen pressures in hydriding combustion synthesis [J].

Li, LQ ;

Akiyama, T ;

Yagi, J .

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 2001, 26 (10) :1035-1040

[10] On the characterization of La1.5Mg17Ni0.5 composite materials prepared by hydriding combustion synthesis [J].

Li, Q ;

Lin, Q ;

Jiang, LJ ;

Chou, KC .

JOURNAL OF ALLOYS AND COMPOUNDS, 2004, 368 (1-2) :101-105

← 1 2 →