Abstract
Abstract The behavior of powders and electrodes of Laves phase alloys with C14 and C15-type structures was studied in 6 M KOH solution containing hydrazine monohydrate at 20°C. When these alloy powders were immersed in the solution, they extracted hydrogen from hydrazine and absorbed until the absorbing hydrogen reached the maximum value (about H / M =1, 410–429 mAh/g) after about 30 h. The initial rate of hydrogen absorption of these alloy powders was in the range of 26.2 to 37.0 mA/g when the rate was converted into the current density. On the other hand, as the electrode made from alloy powder was immersed in 6 M KOH solution containing 10 vol.% hydrazine monohydrate and was discharged, the electrode potential was linearly shifted to the cathodic side with the increase in current density. The current density reached 550–664 mA/g at −0.9 V versus Ag/AgCl which was shifted about 300 mV from the rest potential to the cathodic side.
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