Effects of Nd-addition on the structural, hydrogen storage, and electrochemical properties of C14 metal hydride alloys
作者： D.F. Wong , K. Young , J. Nei , L. Wang , K.Y.S. Ng
DOI: 10.1016/J.JALLCOM.2015.06.055
关键词: Doping 、 Magnetic susceptibility 、 Metallurgy 、 Hydride 、 Metal 、 Lattice constant 、 Alloy 、 Chemical engineering 、 Hydrogen storage 、 Laves phase 、 Materials science
摘要: Abstract Nd-addition to the AB2-based alloy Ti12Zr22.8−xV10Cr7.5Mn8.1Co7.0Ni32.2Al0.4Ndx is studied for its effects on structure, gaseous-phase hydrogen storage, and electrochemical properties. This study follows a series of Cu, Mo, Fe, Y, Si, La doping studies in similar alloys. Limited solubility Nd main Laves phase promotes formation secondary phases (AB Zr7Ni10) provide catalytic synergies improved capacity high-rate dischargeability (HRD) performance. The C14 storage has smaller lattice constants cell volumes, these reduce at higher levels. Different absorption mechanisms can occur multi-component, multi-phase alloys depending interfaces phases, they have Higher Nd-levels improve HRD performance despite having lower bulk diffusion surface exchange current. Magnetic susceptibility measurements indicate large percentage larger metallic nickel clusters are present oxide with Nd-content, AC impedance show very low charge-transfer resistance high capability The −40 °C 8.9 Ω g this Nd-series lowest measured out investigating doped MH low-temperature characteristics. improvement appears be related proportion highly NdNi-phase surface, which must offset increased alloy.
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