摘要
Mg2FeH6 doped with and without Ti and its alloys (TiMn2, TiAl) were prepared combing ball milling and heat treatment. The effects of these additives on the dehydrogenation performance of Mg2FeH6 were studied systematically. The results show that all additives have favor influence on improving the hydrogen desorption property of Mg2FeH6. Especially, TiMn2 exhibits prominent effect on enhancing the dehydrogenation kinetics of Mg2FeH6. Moreover, the activation energy of TiMn2-doped Mg2FeH6 calculated by Kissinger equation is 94.87 kJ/mol, which is 28 kJ/mol lower than that of the undoped Mg2FeH6. The cycling tests suggest that the improved dehydrogenation kinetics of Mg2FeH6 doped by TiMn2 can maintain in the second cycle.
结合球磨和热处理制备掺杂Ti,TiMn_2和TiAl的Mg_2FeH_6样品,并系统研究这些添加剂对Mg_2FeH_6样品放氢行为的影响。研究结果表明:所有添加剂都能够在一定程度上改善Mg_2FeH_6的放氢性能,特别是TiMn_2对Mg_2FeH_6的放氢动力学性能改善效果显著。根据Kissinger方程计算出掺杂TiMn_2的Mg_2FeH_6样品的放氢活化能为94.87 k J/mol,与未掺杂的Mg_2FeH_6样品相比,降低了28 kJ/mol。另外,掺杂TiMn_2的Mg_2FeH_6样品在循环测试过程中仍具有良好的放氢性能改善效果。
基金
Project(2010CB631300)supported by the National Basic Research Program of China
Project(2012AA051503)supported by the National High Technology Research&Development Program of China
Projects(51001090,51171173)supported by the National Natural Science Foundation of China
Project(IRT13037)supported by the Program for Innovative Research Team in University of Ministry of Education of China
