The electrode characteristics of over-stoichiometric ZrMn0.5V0.5Ni1.4+y (y=0.0, 0.2, 0.4 and 0.6) alloys with C15 Laves phase structure

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

“…This is consistent with the higher plateau pressure and weaker metal-bond strength in the alloys with a higher Ti-content. Most of the previous works reported similar findings [20][21][22]26,31]. The only exception we can found is, in the case of high-Zr alloys, total capacity increases as the amount of titanium addition increases, but the high rate dis- Fig.…”

Investigation of microstructure and electrochemical properties of Ti0.8Zr0.2V2.7Mn0.5+xCr0.8Ni1.5−x hydrogen storage alloys

“…When the discharge current density is 800 mA/g, the HRD of the alloy electrode first increases from 46.3% (x = 0.0) to 50.1% (x = 0.1) and then decreases to 29.7% with further increasing x. It was reported that Mn was favorable to the HRD of the alloy electrode because it made the alloy easily pulverized and thus increased the reaction surface area [19]. On the other hand, Ni is known for its good electrocatalytic activity for the electrochemical decom- position of H 2 O on the surface of the electrode, and decreasing Ni content can worsen the HRD of alloy electrodes [22].…”

“…With increasing Mn content, the maximum discharge capacity of the alloy electrode increases first from 324.8 mAh/g (x = 0.0) responsible for the degradation of hydrogen storage electrode alloys. Kim et al [19] reported that Mn made the alloy brittle and easily pulverized during charge-discharge cycles. Yu et al [20] also found that a decreasing Mn amount could slow down the pulverization of the hydrogen storage alloy and thus improve the cycle life of the electrodes.…”

Effect of Ni concentration on the structural and hydrogen storage characteristics of Zr–Mn based laves phase system

“…They have also concluded that ZrMnNi is the most promising hydride with the hydrogen filling of *3.5 hydrogen atoms per formula unit under near ambient conditions. Kim et al [16] have studied several Zr-Mn-Ni-V alloys and observed that the equilibrium plateau pressure gets significantly enhanced with the concentration of Ni content.…”