低温球磨制备镁基储氢材料及其性能研究

Preparation and Performance of Mg-Based Hydrogen Storage Materials by Cryomilling

用液氮低温球磨技术制备Mg-8mol%LaNi0.5储氢材料。采用XRD和SEM研究材料的相结构和表面形貌,采用激光法测定粒度分布,采用PCT设备研究材料的储氢性能。结果表明:经过10h球磨后,该材料有少量合金相生成;材料平均粒度为10μm左右;材料具有平坦的吸放氢平台,吸氢量在573K时为2.33%(质量分数);在4.0MPa氢压和523～653K条件下,3～5min内完成饱和吸氢量的80%以上。低温球磨制备的材料活化性能好,不需活化,平台性能好,动力学性能得到改善。

The Mg-8 mol% LaNi0.5 hydrogen storage materials were prepared by mechanically milling at cryogenic temperature （cryomilling）. The phase structure and surface morphology of the materials were studied by XRD and SEM, the granularity distribution was determined by laser method, the hydrogen storage performance of the materials were studied by an equipment of PCT （pressure-composition-Temperature）. The results showed that a small amount of the alloy phase appeared after ten hours. The average particle size of the materials is 10 μm. The materials had a flat platform of hydrogen absorption and desorption, the hydrogen storage capacity is 2.33 wt% at 573 K. Under 4.0 MPa hydrogen pressure, the materials can absorb more than 80% of their full hydrogen capacity in 3 min to 5 min at 523 K-653 K. The materials prepared by cryomilling had better activation performance, without activation, and fine platform performance, and the dynamic performance was improved.