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Vol.28, No.1, 87 ~ 92, 1990
Title
Effects of Excess CFM Amount on the hydrogen Storage Properties of ( CFM ) Ni5
노학Hak Noh, 박충년Choong Nyeon Park, 김대룡Dae Ryong Kim
Abstract
The hydrogen storage properties of (CFM)Ni_5 were investigated by varying the amount of excess CFM, where CFM denotes Ce-free misch metal. The results showed that, within 10% of excess CFM, the unit cell volume, the standard enthalpy change for hydrogen desorption and the effective hydrogen storage capacity increased while the plateau pressure decreased. When the amount of excess CFM was higher than 10%, the effective hydrogen storage capacity decreased whereas the other properties remained nearly constant. It was suggested that about 10% of the excess rare earth metal should be added during the melting process in order to fabricate the best hydrogen storage alloy in rare earth-nickel system.
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