Microstructure and electrochemical properties of Ti-containing AB(2) type hydrogen storage electrode alloy

The microstructure and electrochemical properties variation of alloy Zr(MnV Ni)(2) after Ti substitution for Zr was investigated. The microstructures o f Zr1-xTix(MnVNi)(2) (s = 0, 0.5) alloys were determined with X-ray diffrac tion (XRD), transmission electron microscopy (TEM), high resolution electro n microscopy (HREM) and energy dispersive spectrum (EDS) analysis. The syst ematic structural analysis shows that there are two phases in the Ti-substi tuted alloy Zr0.5Ti0.5(MnVNi)(2) the C14 Laves and the Ti containing "prema rtensite" R phase, Ti(0.8)ZT(0.2)Ni The variation in electrochemical proper ties of the alloy Zr(MnVNi)(2) after partial Ti substitution can be attribu ted to the Ti substitution for some Zr sites in C14 Laves phase, the format ion of Ti0.8Zr0.2Ni R-phase and the disappearance of Zr-Ni binaries. (C) 20 00 International Association for Hydrogen Energy. Published by Elsevier Sci ence Ltd. All rights reserved.