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金属学报  2004, Vol. 40 Issue (5): 531-536     
  论文 本期目录 | 过刊浏览 |
热蒸发法制备Mg和Mg-Ni薄膜及其氢化性能
王辉; 欧阳柳章; 曾美琴; 朱敏
华南理工大学机械工程学院; 广州 510640
Hydrogen Storage Properties of Mg and Mg-Ni Films Prepared by Thermal Evaporation
WANG Hui; OUYANG Liuzhang; ZENG Meiqin; ZHU Min
College of Mechanical Engineering; South China University of Technology; Guangzhou 510640
引用本文:

王辉; 欧阳柳章; 曾美琴; 朱敏 . 热蒸发法制备Mg和Mg-Ni薄膜及其氢化性能[J]. 金属学报, 2004, 40(5): 531-536 .
, , , . Hydrogen Storage Properties of Mg and Mg-Ni Films Prepared by Thermal Evaporation[J]. Acta Metall Sin, 2004, 40(5): 531-536 .

全文: PDF(10662 KB)  
摘要: 采用热蒸发法制备了纯Mg膜及Mg78Ni22合金膜, 研究了薄膜的结构及其氢化性能. Mg膜具有典型的柱状晶结构, 择优取向生长趋势明显; Mg78Ni22薄膜由纳米晶Mg2Ni, Mg及少量非晶组成, Mg2Ni相沿着平行于薄膜表面的(001)方向择优生长. 纯Mg膜的吸放氢温度分别为593和653 K, 其吸氢过程遵循形核长大机制. Mg78Ni22薄膜的压力-组成等温曲线存在低压和高压两个平台区, 分别对应Mg和Mg2Ni的氢化反应, 薄膜内Mg的吸放氢温度可分别降至473和503 K, 薄膜的最大吸氢量(质量分数)达到5.7%. Mg的氢化性能改善与薄膜中纳米晶Mg2Ni和非晶相起到的催化作用有关.
关键词 储氢合金 热蒸发 Mg膜     
Abstract:Microstructure and hydrogenation properties of Mg and Mg-Ni films fabricated by thermal evaporation method were investigated. The as deposited Mg film exhibits a preferred orientation and a typical columnar crystalline structure. The as deposited Mg-Ni film with a composition of Mg78Ni22 is composed of nanocrystalline Mg2Ni, Mg and a small amount of amorphous phase. Besides, the Mg2Ni crystallites grow with their (001) crystalline plane parallel to the substrate surface. The hydrogen absorption and desorption temperatures of pure Mg film are 593 K and 653 K, respectively and its hydriding reaction follows a nucleation and growth mechanism. Pressure-composition isotherms of Mg78Ni22 film show that its maximum hydrogen absorption capacity (mass fraction) reaches to 5.7\% and there are the lower and higher pressure plateaus corresponding to the hydriding reactions of Mg and Mg2Ni, respectively. The hydriding/dehydriding temperatures of Mg in Mg78Ni22 film decreased down to 473 K and 503 K, respectively. The improvement on the hydrogenation properties of Mg is related to the catalytic role of nanocrystalline Mg2Ni and amorphous phase.
Key wordshydrogen storage alloy    thermal evaporation    Mg film
收稿日期: 2003-05-09     
ZTFLH:  TG139.7  
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