纳米晶镁粉的吸放氢动力学模型分析  

Model Investigation of Hydrogen Absorption and Desorption Kinetics of Nanocrystalline Magnesium

作　　者：刘静[1] 李谦[1] 周国治[1] 林根文[1] 

机构地区：[1]上海大学材料科学与工程学院,上海200072

出　　处：《稀有金属材料与工程》2007年第10期1802-1806,共5页Rare Metal Materials and Engineering

基　　金：上海市基础研究重点项目(05JC14064;06JC14031);上海市青年科技启明星计划(06QA14021);上海市教委项目(06AZ001)

摘　　要：利用一种新模型分析了纳米晶镁粉的吸放氢动力学,量化了球磨和添加剂Pd对镁粉吸放氢动力学性能的改善效果。结果表明,球磨能大幅度降低氢化反应活化能,提高镁粉的氢化速率30倍。添加1%(质量分数)Pd的纳米镁粉(30nm)的吸放氢速率比未添加Pd的纳米镁粉(30nm)的吸氢速率提高6.6倍。模型计算出30nmMg-1%Pd(质量分数)合金的吸氢活化能为38.74kJ/molH2。The kinetics of hydrogen absorption and desorption of nanocrystalline magnesium powder was investigated adopting a new model, which quantized the improvement efficiency of the hydrogen absorption and desorption （Pd-doped or undoped）. The results show that the ball milling process can decrease the activation energy of hydriding reaction, increases the hydriding rate of Mg powder by 30 times. The hydriding rate of Mg-lwt%Pd powder with 30 nm particle size is 6.6 times faster than that of the Mg powder with 30 nm. The hydriding activation energy of the former was calculated to be 38.74 kJ/molH2 by the model.

关 键 词：储氢合金 纳米晶镁粉 吸放氢动力学 模型 

分 类 号：TB383.1[一般工业技术—材料科学与工程]