采用球磨的方式在NaAlH4中掺入稀土催化剂Ce(SO4)2,通过X射线衍射仪(XRD)、扫描电镜(SEM)及PCT(pressure content temperature)测试仪研究了球磨时间对NaAlH4的相结构和吸放氢性能的影响.结果表明,经过不同时间球磨后,掺杂Ce( SO4)2的NaAlH4样品仍由NaAlH4相和Ce(SO4)2相组成,球磨没有改变样品的相组成.但是样品的放氢温度均降低,并在球磨6h时达到最大程度,放氢温度下降了40℃.吸氢后的样品中均存在Al,Na3AlH6和掺杂相Ce(SO4)2,球磨3和6h的样品还存在NaAl4相,说明第二步吸氢反应的程度较大.球磨6h的样品的吸氢性能最好,吸氢量达到3.598％(质量分数).球磨时间越长,颗粒越细小,颗粒细化是提高样品吸放氢性能的主要原因.但球磨时间过长后,颗粒团聚逐渐严重,吸放氢性能下降.
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