Hydriding properties of nanocrystalline Mg 2− xM xNi alloys synthesized by mechanical alloying (M=Mn, Al)

Abstract

The nanocrystalline Mg-based hydrogen storage, Mg 2− x M x Ni (M=Mn, Al and x=0, 0.25, 0.5), alloys have been synthesized by mechanical alloying followed by annealing (450 °C/0.5 h). The structure of these materials have been examined by X-ray diffraction (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM). Thermodynamic and electrochemical properties have also been investigated. The hydrogen content of synthesized alloys is decreased compared to Mn-, Al-free Mg 2Ni material. On the other hand, substituted nanocrystalline Mg-based alloys show substantially enhanced discharge capacity, at room temperature.