Structural and electrochemical properties of TixZr7−xNi10

Gaseous phase hydrogen storage and electrochemical properties of Zr8Ni21, Zr7Ni10, Zr9Ni11, and ZrNi metal hydride alloys

“…Among the annealed alloys, only DH (heat of i n t e r n a t i o n a l j o u r n a l o f h y d r o g e n e n e r g y 3 7 ( 2 0 1 2 ) 1 6 0 4 2 e1 6 0 5 5 hydride formation) and DS of ZN0710A can be obtained (À46 kJ mol À1 H 2 and À130 J K À1 mol À1 H 2 , respectively). These results are very similar to the previously reported values for annealed Zr 7 Ni 10 (À50 to À47 kJ mol À1 H 2 and À144 to À132 J K À1 mol À1 H 2 [39,40,44,48,69], respectively).…”

“…2c). Similar finding was reported previously, and the FCC structured phase was confirmed to be C15, one of the Laves phases with a composition of AB 2 , by SEM electron channeling pattern analysis, and the presence of C15 in unannealed Zr 7 Ni 10 alloy was attributed to the localized non-stoichiometry due to the formation of ZrO 2 [48]. Therefore, the FCC secondary phase in ZN0710 is assigned as C15 with lattice constant a ¼ 6.912 A.…”

“…Gaseous phase hydrogen storage and electrochemical properties of Zr 8 Ni 21 [31,35e38], Zr 7 Ni 10 [12,13,31,35,36,39e48], Zr 9 Ni 11 [12,31,35,36,43,48,50], and ZrNi [12,39,41,49,51e57] have been studied previously. Among these research efforts, few provided side-by-side comparisons among the four nonLaves phase alloys.…”

Examination of Multiphase (Zr,Ti)(V,Cr,Mn,Ni)2 Ni-MH Electrode Alloys: Part II. Solid-State Transformation of the Interdendritic B2 Phase

“…[10,11] The dominating crystal structure of Ti x Zr 7-x Ni 10 (x between 0 and 2.5) is also orthorhombic before and turns into tetragonal after hydrogenation. [12] With a small amount of vanadium included, the alloy Ti 1.5 Zr 5.5 V 0.5 Ni 9.5 is still dominated by the orthorhombic Zr 7 Ni 10 structure. [13] An I-centered tetragonal lattice was reported for Zr 9 Ni 11 by Kirkpatrick and Larsen, [14] and the structure subsequently was shown to be isomorphous with Zr 9 Pt 11 , [15,16] with I4/m space group.…”

Structural, thermodynamic, and electrochemical properties of TixZr1−x(VNiCrMnCoAl)2 C14 Laves phase alloys

“…First cycle capacity as high as 464 mAh/g was reported on a Ti 0.26 Zr 0.07 V 0.24 Mn 0.20 Ni 0.23 alloy [14], but part of its capacity may have come from the non-reversible metal oxidation. In our laboratory, we discovered an alloy with an initial discharge capacity at 483 mAh/g at a discharge current of 10 mA/g and a gas-phase hydrogen storage above 2.0 wt.% at 30 • C [15].…”