摘要
采用热处理工艺并结合机械合金化制备Mg-Al合金,同时利用XRD、SEM以及吸放氢测试对其性能进行表征,研究过渡金属V、Ti及Y的添加对Mg-Al合金储氢性能的影响。结果表明:材料主要由Mg17Al12相组成,Mg17Al12的氢化产物为MgH2和Al,且该过程是可逆的,并在过渡金属的催化作用下,Mg-Al合金的综合储氢性能明显提高;Mg-Al合金的初始放氢温度为577 K,添加V、Ti以及Y后,合金材料的初始放氢温度分别下降了80、46和60 K。此外,Mg-Al合金材料脱氢反应的表观活化能为175.1 kJ/mol,掺杂V、Ti及Y后合金材料脱氢反应的表观活化能从175.1 kJ/mol分别下降到134.6、134.9和131.4 kJ/mol,进一步证实了过渡金属元素V、Ti以及Y的添加能有效提高材料的综合储氢性能。
The Mg-Al alloy was prepared by means of mechanical alloying combined with heat treatment,and the influences of transition elements(V,Ti,Y)on the hydrogen storage property of Mg-Al alloy were characterized by X-ray diffractometry(XRD),scanning electron microscopy(SEM)and hydrogenation/dehydrogenation testing.The results show that the alloy is mainly composed of Mg17Al12 and the hydrogenated products for Mg17Al12 alloy are MgH2 and Al.The integrated hydrogen storage performance for the Mg-Al alloy is improved obviously with the catalytic action of the transition metal(V,Ti,Y).For example,the initial desorption temperatures for Mg-Al-M(V,Ti,Y)alloy are 80,46 and 60 K lower than that of Mg-Al alloy(577 K).In addition,with the addition of the transition elements(V,Ti,Y),the apparent activation energy for the Mg-Al alloy(328.9 kJ/mol)decreases to 260.3,188.1 and 289.4 kJ/mol,respectively.These results further demonstrate that the addition of transition metal(V,Ti,Y)is benefit to improve the hydrogen storage performance of Mg-Al alloy.
作者
黄显吞
卿培林
覃昌生
谢政专
HUANG Xian-tun;QING Pei-lin;QIN Chang-sheng;XIE Zheng-zhuan(Department of Materials Science and Engineering,Baise College,Baise 533000,China;College of Physical Science and Technology,Guangxi University,Nanning 530004,China)
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2020年第2期333-340,共8页
The Chinese Journal of Nonferrous Metals
基金
广西自然科学基金资助项目(2014GXNSFAA118346)
广西高校重点学科(KS16ZD06)
广西高校科学研究资助项目(KY2015LX385)。
关键词
MG-AL合金
机械合金化
过渡金属
储氢性能
Mg-Al alloy
mechanical alloying
transition element
hydrogen storage property
