Mg₂FeH₆储氢材料的反应机械合金化合成及其放氢性能

来源期刊：中南大学学报(自然科学版)2008年第1期

论文作者：李松林 刘燚 崔建民 杨文智 李浩鹏 何轶伦

文章页码：1 - 6

关键词：燃料电池；镁基储氢材料；反应机械合金化；球磨

Key words：fuel cell; magnesium-based hydrogen storage materials; reactively mechanical alloying; ball milling

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 ℃。

Abstract: 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 ℃.

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