Abstract
V-based TiV2.1Ni0.3 alloy with high hydrogen storage capacity was surface-modified by ball-milling with amorphous MgNi alloy prepared by mechanical alloying. In charge–discharge cycle measurements, the decrease in discharge capacity for the prepared TiV2.1Ni0.3–MgNi composites was effectively suppressed in comparison with the TiV2.1Ni0.3 alloy. In particular, ball-milling for 3 h is the most effective in the present study. This was explained by surface analyses with EPMA mapping and X-ray photoelectron spectroscopy (XPS). Changes in the EPMA maps, XPS spectra and depth profiles of the surface alloy components suggested that the ball-milling caused the mutual diffusion between Mg and a little of the Ni components in the MgNi alloy and Ti and V components in the TiV2.1Ni0.3 alloy at the interface between both alloys. In addition, stable time course of rest potential for the TiV2.1Ni0.3–MgNi composite electrodes immersed in 6 M KOH solution also showed the effectiveness of the surface modification with ball-milling.
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