【作者】 李志念； 刘晓鹏； 蒋利军； 王树茂；

【Author】 LI Zhi-nian , LIU Xiao-peng JIANG Li-jun , WANG Shu-mao (Energy Material & Technology Research Institute,General Research Institute for Nonferrous Metal, Beijing 100088, China)

【机构】 北京有色金属研究总院能源材料与技术研究所；

【摘要】 采用机械球磨LiNH2／MgH2混合物(摩尔比2／1．1)制备一种新型储氢材料Li-Mg-N-H。在氩气保护下, 将样品分别球磨2 h(1#)、5 h(2#)和10 h(3#)。DSC测试结果表明,3种样品均可在170℃左右开始快速放氢,且随着球磨时间增加,放氢温度呈下降趋势。吸放氢测试结果显示:200℃时,样品在6 MPa最大吸放氢量为4．4％, 0．1 MPa放氢压力条件下最大放氢容量为3．39％,上述反应在1 h内可完成总量的80％以上;随着球磨时间增加, 样品活性增大,首次吸放氢循环即可达到最大容量,但球磨时间过长导致样品吸放氢容量的下降。运用XRD考察了样品吸放氢循环前后的物相变化。更多还原

【Abstract】 In this paper, a new kind of hydrogen storage material Li-Mg-N-H was prepared by mechanical milling of LiNH2/MgH2 mixture (in molar ratio of 2/1.1) under argon gas protection. The samples were milled for 2 h, 5 h and 10 h denoted as 1# , 2# and 3# , respectively. DSC measurements indicate that the samples begin to release hydrogen at about 170 ℃ and the reaction temperature decrease with the increasing of milling time. The maximum hydrogen absorption and desorption capacity of the samples are 4.4% under 6 MPa hydrogen pressure and 3.39% to 0.1 MPa at 200 ℃, respectively. The samples can achieve the maximum hydrogen storage capacities during the first absorption/desorption cycle when the milling time is more than 5 hours, but the hydrogen storage capacities decreases. The phase evolution of the samples is also detected by XRD measurements.更多还原