Long-term testing and stability of CaNi5 alloy for a hydrogen storage application

Abstract CaNi 5 alloy in a long-term test in excess of 5000 charge/discharge cycles demonstrated good stability. The hydrogen absorption was in the 20–40°C range at hydrogen pressures of 1.07–1.35 atm. The hydrogen desorption in the 50–60°C range was at 1.14–2.36 atm. A hydrogen working capacity under the above test conditions of ca 0.8% by weight was obtained.