Hydrogen absorption-desorption properties of Mg/Fe multi-layer film with PLD

Abstract

Hydrogen storage alloy has a potential material to become one of the most promising candidates as an effective storage system and it has higher safety and storage density than other storage systems. The Mg-based hydrogen storage alloy has the advantage of high hydrogen storage density (7.6 wt% in MgH2), light weight and low cost, while it needs to improve its slow reaction kinetics and high desorption temperature for practical applications. In this research, we prepared the Mg/Fe multi-layer films with the pulsed laser deposition (PLD) method and studied their hydrogen absorption and desorption properties for the effects of the order of layer and the Ti layer on the surface. The differential scanning calorimetry (DSC) and X-Ray diffraction (XRD) were carried out to characterize the hydrogen desorption temperature and the hydride. As a result, it found that Polyimide/Fe/Mg/Ti multi-layer showed to make the magnesium hydride after hydrogenation and to leave it at 245°C and that is 173°C lower than that of pure magnesium hydride and Polyimide/Mg/Fe/Ti, Polyimide/Fe/Mg and SUS304/Fe/Mg/Ti showed no hydrogen desorption after the hydrogenation.

Keywords

• hydrogen storage
• mg/fe multi-layer thin film
• pulsed laser deposition
• hydrogen desorption temperature