Mg2FeH6储氢材料的反应机械合金化合成及其放氢性能  

Synthesis and hydrogen desorption properties of Mg_2FeH_6 hydrogen storage material by reactive mechanical alloying

作　　者：李松林[1] 刘燚[1] 崔建民 杨文智[1] 李浩鹏[1] 何轶伦[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083 [2]莱钢集团粉末冶金有限公司,山东莱芜271105

出　　处：《中南大学学报（自然科学版）》2008年第1期1-6,共6页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(50574105);湖南省自然科学基金资助项目(05JJ30096);教育部新世纪优秀人才计划项目(2006年);教育部留学回国人员科研启动基金资助项目

摘　　要：以Mg和Fe元素粉末为原料,在双行星式球磨机的氢气气氛中反应球磨,合成Mg2FeH6储氢材料。探讨分别采用Mg和Fe原料配比为化学计量(2:1)和非化学计量(3:1)直接反应球磨,以及采用将Mg和Fe混合粉末在氩气气氛中预磨20 h后再通氢反应等球磨方式。研究结果表明:Mg和Fe以非化学计量比(3:1)在氢气气氛中直接球磨所得样品,Mg2FeH6的合成产率最高,达到83.7%;DSC和TGA测试显示样品实际放氢量为2.91%,Mg和Fe以化学计量比(2:1)直接反应球磨得到的Mg2FeH6具有最低的起始放氢温度204.4℃。Mg and Fe element powders were reactively ball milled under H2 atmosphere in a planetary ball mill to synthesize Mg2FeH6 hydrogen storage materials. Milling parameters such as the starting powder mole ratio of Mg to Fe as stoichiometric 2：1 and nonstoichiometric 3：1, premilling under Ar atmosphere for 20 h before reactively milling under H2 atmosphere were investigated. The results show that the highest yield of Mg2FeH6 83.7%, is acquired in the sample with powder mole ratio of Mg to Fe as 3：1 and directly milled under H2 atmosphere. DSC and TGA measurements show that the highest hydrogen release amount is 2.91%. The sample milled with the powder mole ratio of Mg to Fe as 2：1 and directly milled under H2 atmosphere has the minimum hydrogen desorption starting temperature 204.4 ℃.

关 键 词：燃料电池 镁基储氢材料 反应机械合金化 球磨 

分 类 号：TG139.7[一般工业技术—材料科学与工程]