Hydrogen storage properties of MgH2 processed by cold forging

被引：18

作者：

Cesario Asselli, Alexandre Augusto ^{[1
,2
]}

Leiva, Daniel Rodrigo ^{[1
]}

Cozentino, Gustavo Henrique ^{[1
]}

Floriano, Ricardo ^{[1
]}

Huot, Jacques ^{[2
]}

Ishikawa, Tomaz Toshimi ^{[1
]}

Botta, Walter Jose ^{[1
]}

机构：

[1] Univ Fed Sao Carlos, Dept Mat Engn, BR-13565905 Sao Carlos, SP, Brazil

[2] Univ Quebec Trois Rivieres, Inst Rech Hydrogene, Trois Rivieres, PQ G9A 5H7, Canada

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2014年 / 615卷

基金：

巴西圣保罗研究基金会;

关键词：

Metal hydrides; Cold work; Nanostructured materials; Hydrogen storage;

D O I：

10.1016/j.jallcom.2014.01.065

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 the hydrogen storage properties of cold forged MgH2 were investigated. Magnesium hydride was processed in air by close-die drop forging at room temperature. The effects of processing parameters such as drop height of the hammer and number of forging passes were evaluated. The influence of final thickness of the forged samples was also studied. Cold forging of MgH2 resulted in pronounced grain refinement and enhanced hydrogen storage properties. Faster kinetics of hydrogen absorption and desorption were achieved by higher energy processing such as releasing the hammer from higher heights and increasing the number of applied forging passes. Results concerning sample thickness showed that MgO formation plays an important role to degrade both hydrogen capacity and kinetics. As a result of preferential surface oxidation of the forged MgH2, thicker samples showed better hydrogen storage properties. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：S719 / S724

页数：6

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