Investigation of Effect of Milling Atmosphere and Starting Composition on Mg2FeH6 Formation

Metals

Alexandre Augusto Cesario Asselli¹ 

[1] Hydrogen Research Institute, Université du Québec à Trois-Rivières, 3351, boul. des Forges, C.P. 50, Trois-Rivières (Québec) G9A 5H7, Canada; E-Mail

关键词: metal hydride;    Mg₂FeH₆;    ball milling;    hydrogen storage;   

DOI  :  10.3390/met4030388

来源: mdpi

【 摘 要 】

In this study we investigated the synthesis and the hydrogen storage properties of Mg₂FeH₆. The complex hydride was prepared by ball milling under argon and hydrogen atmosphere from 2Mg + Fe and 2MgH₂ + Fe compositions. The samples were characterized by X-ray powder diffraction and scanning electron microcopy. Kinetics of hydrogen absorption and desorption were measured in a Sievert’s apparatus. We found that the milling atmosphere plays a more important role on Mg₂FeH₆ synthesis than the starting compositions. Ball milling under hydrogen pressure resulted in smaller particles sizes and doubled the yield of Mg₂FeH₆ formation. Despite the microstructural differences after ball milling, all samples had similar hydrogen absorption and desorption kinetics. Loss of capacity was observed after only five cycles of hydrogen absorption/desorption.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.