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applied for calculation. It is found that their hydriding kinetics notably declines, however, their hydrogen desorption kinetics conspicuously improves, with spinning rate and Y content increasing......
that both of the as-milled alloys exhibit a nanocrystalline and amorphous structure. The RE=Y alloy shows a larger hydrogen absorption capacity, faster hydriding rate, lower initial hydrogen desorption... as their oxides [28], fluorides [29], halides [7], hydrides [21] and intermetallic compounds [19] are verified to be good catalysts which can destabilize MgH2 and enhance the de-/hydriding rate......
kinetics of the alloys appear to be evident. The gaseous hydriding kinetics of the alloys first rises and then declines with the growing of M (M=Cu, Co, Mn) content. Particularly, the M (M= Mn) substitution results in a sharp drop in the hydriding kinetics when x=4. The M (M=Cu, Co, Mn) substitution ameliorates the dehydriding kinetics dramatically in the order (M=Co)>(M=Mn)>(M=Cu......
by mechanical alloying method.The kinetics of hydriding process and electrochemical properties of La2Mg17-x wt.%Ni(x=0,50,100,150,200) composites were investigated.X-ray diffraction(XRD) and scanning......
by mechanical alloying method.The kinetics of hydriding process and electrochemical properties of La2Mg17-x wt.%Ni(x=0,50,100,150,200) composites were investigated.X-ray diffraction(XRD) and scanning......
spinning ameliorates the hydriding and dehydriding kinetics of the alloys dramatically. Specially, the rising of the spinning rate from 0 (the as-cast was defined as the spinning rate of 0 m/s) to 40...%) for Mg2NiH4 [6-7]. However, the practical application of the Mg-based alloys is frustrated by some inherent disadvantages such as relatively high dehydrogenation temperature and sluggish hydriding......
. The results show that the hydriding and dehydriding kinetics of MgH2 are markedly improved by doping TiF3 and FeF3 fluorides. At 573 K, the two composites can absorb 5.67%-6.07% (mass fraction) hydrogen within... of 313-473 K. In comparison, TiF3-doped sample has a better hydriding-dehydriding kinetics than FeF3-doped sample. The microstructure analysis shows that some active particles including MgF2, TiH2......
金属钒对镁基合金储氢性能的影响刘志兵,朱云峰,杨阳,顾昊,李李泉南京工业大学材料科学与工程学院摘 要:镁及镁基储氢合金具有储氢容量高,成本低及污染小等优点,被认为是用于车载储氢方面较有前途的材料.然而镁基合金存在吸放氢温度较高,吸放氢速度较慢的缺点,抑制了它的实际应用.研究表明,制备多元镁基合金可明显改善合金的储氢性能.采用氢化燃烧合成(Hydriding Combustion Synthesis-HCS)和机械球磨(Mechanical Milling-MM),即HCS+MM技术复合制备Mg90Ni10-xVx(x=0,2,4,6,8)合金.采用X射线衍射仪,扫描电镜及气体反应控制器研究了HCS+MM产物的相组成,表面形貌以及吸放氢性能.XRD分析表明,不同合金均含有......
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treatment. The pulverization degree of both the as-cast and annealed alloy powders after gaseous hydriding and dehydriding cycle was investigated and the discovery was that annealing treatment could hardly......