Mg-20%(RE-Ni)(RE=La,Y,Mm)复合材料储放氢性能研究

Preparation and Hydrogen Storage Properties of Mg-20%(RE-Ni)(RE=La,Y,Mm) Composites

通过磁悬浮熔炼和反应球磨相结合的方法成功制备出Mg-20wt%(RE-Ni)(RE=La,Y,Mm)复合储氢材料,主要研究了材料的物相结构和储放氢性能。结果表明,Mg-20wt%(RE-Ni)(RE=La,Y,Mm)复合储氢材料,具有相似的物相结构和吸放氢热力学性能,吸氢相均为MgH2和Mg2Ni,在同一温度下,合金只有一个放氢平台,表明两相具有良好的协同放氢效应。在复合体系中,Mg-20wt%(Y-Ni)具有最佳的综合储氢性能,表明Y具有最佳的催化效果,其在293 K,3.0 MPa H2,10 min的吸氢量和573 K,对0.1 MPa,15 min的放氢量可分别达到3.92%和4.75%,实现了室温快速大量吸氢和较温和条件下的快速放氢。

Mg-20% （ RE-Ni ） （ RE = La, Y, Mm） composites were prepared by reactive mechanical alloying （RMA）. X-ray diffraction （XRD） measurement showed that both MgH2 and Mg2NiH4 co-existed in the milled composites. But they only had a single desorption plateau pressure at each temperature, indicating that the both phase had a good synergetic effect onhydrogen desorption process. The Mg-20% （Y-Ni） composite exhibited the best hydrogen sorption properties among these composites. It could absorb 3.92% hydrogen under 3.0 MPa hydrogen pressure at 293 K in 10 min and desorb 4.75% hydrogen at 573 K in 15 min under 0.1 MPa hydrogen pressure, respectively.