借助储氢性能测试仪和Netzsch STA 449F3型同步热分析仪研究催化改性Mg2FeH6体系的放氢特性。程序升温放氢实验和等温放氢实验结果表明,添加了TiMn2、TiAl或Ti的Mg2FeH6样品和未添加催化剂的Mg2FeH6样品放氢反应动力学特征相似,反应速...借助储氢性能测试仪和Netzsch STA 449F3型同步热分析仪研究催化改性Mg2FeH6体系的放氢特性。程序升温放氢实验和等温放氢实验结果表明,添加了TiMn2、TiAl或Ti的Mg2FeH6样品和未添加催化剂的Mg2FeH6样品放氢反应动力学特征相似,反应速率有所提高,但不明显,放氢温度提前27℃左右。且催化性能TiMn2最好,纯Ti其次,TiAl较差。展开更多
Mg-based metal hydrides are promising as hydrogen storage materials for fuel ce ll application. In this work,Mg2FeH6 complex hydride phase was synthesized by controlled reactive ball milling of 2Mg-Fe （atomic ratio）...Mg-based metal hydrides are promising as hydrogen storage materials for fuel ce ll application. In this work,Mg2FeH6 complex hydride phase was synthesized by controlled reactive ball milling of 2Mg-Fe （atomic ratio） powder mixture in H2. Mg2FeH6 is confirmed to be formed via the following three stages: form ation of MgH2 via the reaction of Mg with H2,incubation stage and formation of Mg2FeH6 by reaction of fully refined MgH2 and Fe. The incubation stage is characterized by no traces of Mg or hydride crystalline phase by XRD. On the other hand,Mg is observed uniformly distributed in the milled powder by SEM-E DS. Also,almost the same amount of H2 as the first stage is detected stored i n the powders of the second stage by DSC and TGA.展开更多
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 systemati...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.展开更多
文摘借助储氢性能测试仪和Netzsch STA 449F3型同步热分析仪研究催化改性Mg2FeH6体系的放氢特性。程序升温放氢实验和等温放氢实验结果表明,添加了TiMn2、TiAl或Ti的Mg2FeH6样品和未添加催化剂的Mg2FeH6样品放氢反应动力学特征相似,反应速率有所提高,但不明显,放氢温度提前27℃左右。且催化性能TiMn2最好,纯Ti其次,TiAl较差。
文摘Mg-based metal hydrides are promising as hydrogen storage materials for fuel ce ll application. In this work,Mg2FeH6 complex hydride phase was synthesized by controlled reactive ball milling of 2Mg-Fe （atomic ratio） powder mixture in H2. Mg2FeH6 is confirmed to be formed via the following three stages: form ation of MgH2 via the reaction of Mg with H2,incubation stage and formation of Mg2FeH6 by reaction of fully refined MgH2 and Fe. The incubation stage is characterized by no traces of Mg or hydride crystalline phase by XRD. On the other hand,Mg is observed uniformly distributed in the milled powder by SEM-E DS. Also,almost the same amount of H2 as the first stage is detected stored i n the powders of the second stage by DSC and TGA.
基金Project(2010CB631300)supported by the National Basic Research Program of ChinaProject(2012AA051503)supported by the National High Technology Research&Development Program of China+1 种基金Projects(51001090,51171173)supported by the National Natural Science Foundation of ChinaProject(IRT13037)supported by the Program for Innovative Research Team in University of Ministry of Education of China
文摘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.
