铝对镁碳复合材料吸放氢性能的影响  

Effect of Aluminum on Hydriding/Dehydriding Properties of Mg/C Composites for Hydrogen Storage

作　　者：杨敏建 朱学琴 YANG Min-jian;ZHU Xue-qin(School of Chemical and Engineering,Guizhou University of Engineering Science,Bijie,Guizhou,551700,China;College of Chemical and Environmental Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China)

机构地区：[1]贵州工程应用技术学院化学工程学院,贵州毕节551700 [2]中国矿业大学(北京)化学与环境工程学院,北京100083

出　　处：《贵州工程应用技术学院学报》2021年第3期81-86,共6页Journal of Guizhou University Of Engineering Science

基　　金：贵州省科技计划项目“贵州省典型高原湿地生态保护与修复重点实验室”,项目编号:黔科合平台人才[2020]2002号;“贵州省高层次创新型人才(千层次)”项目,项目编号:毕科人才合字[2021]08号;毕节市科学技术项目“毕节市煤磷化工工程技术中心”,项目编号:毕科合字[2015]1号。

摘　　要：Mg基储氢合金以其高储氢密度、资源丰富、价格便宜等优点而备受关注,但较差的动力学与热力学性能制约了该材料在氢能领域的广泛应用。选用成本较低的金属镁、铝和无烟煤做主要原料,利用机械球磨法制备了60Mg(40-x)CxAl(x=0,2,4,6,8,12)复合材料,借助自行设计的排水装置、X射线衍射仪(XRD)等手段对材料进行结构表征和性能测试的结果表明:Al有助于球磨过程中Mg晶粒的细化,但添加过量的Al会使MgH_(2)与Al在放氢过程中发生反应生成Mg_(17)Al_(12),导致材料储氢密度的降低;在镁碳复合材料中添加适量Al能显著提高材料的储氢密度和放氢动力学性能。其中,60mg34C6Al具有最佳的吸放氢性能,储氢密度为3.67%。Mg-based hydrogen storage alloys have attracted much attention because of their high hydro⁃gen storage density,abundant resources and low price,but their poor kinetic and thermodynamic properties re⁃strict their wide application in the field of hydrogen energy.In this paper,60Mg(40-x)CxAl(x=0,2,4,6,8,12)composites are prepared by mechanical ball milling method by choosing low-cost Mg metal,aluminum and anthracite as the main raw materials,and the materials were structurally characterized and property tested with the help of self-designed drainage device,X-ray diffractometer(XRD)and other means.The results show that:Al helps to refine the Mg grains in the ball milling process,but the addition of excessive Al will cause the reaction between MgH_(2) and Al in the process of hydrogen release to form Mg_(17)Al_(12),which leads to the decrease of the hydrogen storage density of the material;the addition of appropriate amount of Al in the Mg-C compos⁃ites can significantly improve the hydrogen storage density and hydrogen release kinetic performance of the material.Among them,60Mg34C6Al has the best hydrogen absorption and desorption performance,and the hy⁃drogen storage density is 3.67%.

关 键 词：镁 无烟煤 铝 球磨 吸放氢性能 

分 类 号：TQ042[化学工程]