Hydrogen storage properties of the Ti(1.1)CrMn AB2-type Laves phase alloys, for both low (-30 deg C) and high (80 deg C) temperature applications, are improved by substituting Zr at Ti site. In agreement with the larger radius of Zr than Ti, the lattice volume of (Ti(1-x)Zr(x))(1.1)CrMn (x=0, 0.05, 0.06 and 0.1) alloys, prepared by arc melting, increases with x. The increase in the Zr content leads to a decrease in the equilibrium hydrogen sorption pressure plateau and faster absorption kinetics, associated with an increase in the hydrogen storage capacity from 1.9 to 2.2 wt% for Ti(1.1)CrMn and (Ti(0.9)Zr(0.1))(1.1)CrMn alloys, respectively. At -5 C, (Ti(0.9)Zr(0.1))(1.1)CrMn alloy reversibly absorbs and desorbs 2.2 wt% at 160 bar within 250 s. Based on thermodynamic calculated values, the optimized Zr substituted alloy (Ti(0.9)Zr(0.1))(1.1)CrMn desorbs hydrogen at 3.2 bar at -30 deg C and 135 bar at 80 deg C. This is a significant reduction of the sorption pressure plateau as compared with the current technology for mobile applications based on Ti(1.1)CrMn alloy with hydrogen desorption plateau above 400 bar at 80 deg C. Finally, the mechanism of improved hydrogen storage properties is discussed based on the radius and the hydrogen affinity of the substituting element.
Improvement of hydrogen storage properties of the AB2 Laves phase alloys for automotive application
International Journal of Hydrogen Energy ; 33 , 14 ; 3754-3761
2008
8 Seiten, 9 Bilder, 2 Tabellen, 19 Quellen
Article (Journal)
English
On-board hydrogen storage systems for automotive application
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