Abstract
Hydrides of CeNi 5− xCu x ( x = 2, 2.5, 3) were studied in the temperature range of 0–50 °C. Pressure-composition isotherms with well-defined flat plateaux were obtained in this temperature range for x = 2 and 2.5. Substitution of copper for nickel causes a substantial decrease in the hydrogen dissociation pressure. The substitution also lowers the alloy cost. The kinetics of absorption and desorption are extremely fast (90% of the absorption takes place in about 50 s). The heats ΔH of formation of the hydride system are low relative to the value for LaNi 5-H 2. The low value of ΔH together with the high absorption and desorption rates makes these compounds promising materials for technical applications, especially hydrogen storage.
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