Relations between the electrical resistance and hydrogen absorption/desorption for melt-spun Mg₈₇Al₃Pd₁₀ and Ni₆₀Nb₂₀Zr₂₀ amorphous alloys

Mg₈₇Al₃Pd₁₀ and Ni₆₀Nb ₂₀Zr₂₀ amorphous alloys have been prepared by the single-roller melt-spinning technique. We have examined the change in the electrical resistance of the amorphous alloys before and after electrochemical hydrogen charging and discharging in 6N KOH solution at the charging/discharging potentials obtained from cyclic voltammetry measurements. The electrical resistance of both amorphous alloys increases after hydrogen charging. The electrical resistance of the Mg₈₇Al₃Pd₁₀ amorphous alloy decreases to the initial level after hydrogen discharging, while that of the Ni₆₀Nb₂₀Zr₂₀ amorphous alloy shows an extremely small decrease. A 100% resistance decrease has been observed repeatedly in the Mg₈₇Al₃Pd₁₀ amorphous alloy after hydrogen discharging when the hydrogen charging and discharging cycle was repeated 5 times in the KOH solution. This suggests that the Mg ₈₇Al₃Pd₁₀ amorphous alloy can absorb and release hydrogen repeatedly and, apparently also shows good reversibility in the electrical resistance.