【摘 要】
：
本文通过高能球磨MgH2和α-Fe粉的混合物,制备了MgH2-Fe纳米复合材料,并对其吸放氢前后的物相组成、微结构及其储氢性能进行了深入研究.PCT测试结果表明,MgH2-Fe中Mg的氢化焓为-66.8kJ/mol H2,略高于纯MgH2中Mg的氢化焓,而MgH2-Fe吸放氢过程的滞后现象相对于纯MgH2也得到抑制.MgH2-Fe纳米复合材料的起始放氢温度比纯MgH2低180℃,特别是其放氢产物可
【机 构】
：
上海交通大学材料学院轻合金精密成型国家工程研究中心,上海,200240
【出 处】
：
第十五届全国氢能会议暨第7届两岸三地氢能研讨会
论文部分内容阅读
本文通过高能球磨MgH2和α-Fe粉的混合物,制备了MgH2-Fe纳米复合材料,并对其吸放氢前后的物相组成、微结构及其储氢性能进行了深入研究.PCT测试结果表明,MgH2-Fe中Mg的氢化焓为-66.8kJ/mol H2,略高于纯MgH2中Mg的氢化焓,而MgH2-Fe吸放氢过程的滞后现象相对于纯MgH2也得到抑制.MgH2-Fe纳米复合材料的起始放氢温度比纯MgH2低180℃,特别是其放氢产物可在室温附近(303K)以较快速度吸氢,吸氢量在1.5小时内可达1.7wt％.MgH2-Fe优异的低温吸放氢动力学性能主要归因于α-Fe的催化作用.通过透射电子显微镜观察发现,MgH2-Fe在放氢过程中Mg颗粒的(002)晶面是主要沿α-Fe的(200)晶面平行方向形核外延生长,这主要是由于两者的面间距较为接近.这种异质形核及外延生长方式使吸放氢反应的能垒降低,从而提高Mg/MgH2储放氢的动力学性能,降低放氢温度,同时改善吸放氢过程的滞后现象.
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