Abstract
In the present study, the effects of heat treatment on the structures and electrochemical properties of Mg0.9Ti0.1Ni hydrogen storage alloys have been investigated in detail. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses showed that the samples exhibited a predominantly amorphous structure. Electrochemical investigations revealed that heat treatment can improve the maximum discharge capacity and cyclic stability of the alloy electrodes. For Mg0.9Ti0.1Ni alloy prepare by ball milling, the value of Cmax was only 229.9 mAh g-1, however, the value reached 331.9 mAh g-1 after heat treatment at 873K for 8 h and then milling. The cycle voltammetry, electrochemical impedance spectroscopy and potentiodynamic polarization indicated that heat treatment not only increased the discharge capacity but also improved the charge/discharge kinetics of Mg0.9Ti0.1Ni alloy.
Highlights
The MgNi-based hydrogen storage alloys has been considered as one of the most attractive candidates for metal hydride electrode materials of the nickel metal hydride (Ni/MH) rechargeable batteries because of their high hydrogen storage density, low specific gravity, low cost, abundant resource and environmental friendly
This paper focus on the investigation of the effect of heat treatment on the structures and electrochemical properties of Mg Ti Ni hydrogen storage alloys, it is found that
Mg0.9Ti0.1Ni hydrogen storage alloys were prepared by ball milling under argon atmosphere or treating at 873 K for 5 h and ball milling
Summary
The MgNi-based hydrogen storage alloys has been considered as one of the most attractive candidates for metal hydride electrode materials of the nickel metal hydride (Ni/MH) rechargeable batteries because of their high hydrogen storage density, low specific gravity, low cost, abundant resource and environmental friendly. Sakai et al.[13] reported that heat treatment could decrease the crystal defects and increase alloy composition homogenization, and enhance the discharge capacity and cyclic stability of hydrogen storage alloys.
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