Investigation of LaNi5 after prolonged cycling

A Quantitative Analysis of the Hydrogen Sorption Isotherms of MmNi4.25Al0.75.

“…As observed, there is a decrease in the crystallite size and a small variation strain. This is a result of the interaction of hydrogen with IM reported elsewhere, Josephy et al (1991). This effect is also noticed on a larger scale in intermetallic particles through images of morphology by SEM.…”

Hydrogen sorption cycling performance of LaNi4.8Sn0.2

“…Josephy et al [10] obtained also unchanged kinetic proper- ties after 45,000 cycles, on a sample of LaNi 5 . The activation energy E a and k 0 were calculated by exponential regression of the term kP 1/2 /|P − P 1/2 | with respect to the inverted absolute temperature.…”

“…However, many authors have reported accelerated degradation of such materials. Josephy et al [10] observed a loss of 30% of the hydrogen storage capacity of LaNi 5 , after 45,000 thermal cycles between 20 and 80 • C, probably due to oxidation by gas contaminants. In many cases, partial substitution of the nickel by M = Sn, Al, Co, Mn improves the resistance of the resulting LaNi 5−x M x alloys.…”

Structural and hydrogen sorption properties of SmNi5−xAlx system – An experimental and theoretical study

“…Existing data on the stability of these alloys are mostly related to their behavior under thermal ADC [44,45,34,46], but also some work on pressure-induced ADC has been published [47e49]. Josephy et al [39] observed a loss of 30% of the hydrogen storage capacity of LaNi 5 , after 45 000 thermal cycles between 20 and 80 C, probably due to oxidation by gas contaminants. In many cases, partial substitution of the nickel by M ¼ Sn, Al, Co, Mn improves the resistance of the resulting LaNi 5Àx M x alloys.…”