Electrochemical and structural studies on nonstoichiometric AB2-type metal hydride alloys

摘要: Abstract This work reports the results of studies some physical and electrochemical properties three AB2-types non-stoichiometric metal hydride alloys, Ti0.1Zr0.9−xExNi1.1V0.5Mn0.6, where E=Y, La Nb x=0, 0.2 0.4. X-ray diffraction analysis shows that partial substitution Zr by Y or induces an increase in unit-cell parameters alloy, while has opposite effect. absorption near-edge structure measurements show no variation energy occupation 3d electronic levels Ni atoms, a decrease empty density states for Mn, V, compared to corresponding pure elements. In all cases, replacement resulted maximum charge storage capacity, but alloy activation time hydrogen equilibrium pressure are reduced. It is also seen that, within experimental error, transfer step hydriding/dehydriding process independent composition, meaning reaction kinetics not substantially affected substitution.