| Nanoscale TiNi-type hydrogen storage material has been prepared by mechanical alloying (MA). The properties of so produced alloys were studied by XRD and TEM. These studies showed that, firstly, after 20 h of milling, the starting mixture of the elements had transformed almost into an amorphous phase and, secondly, the annealing in high purity argon at 700 œC for 0.5 h led to formation of the CsCl-type structures with a crystallite sizes of about 4-30 nm. Additionally, the effect of Zr on the structure and electrochemical properties of nanocrystalline TiNi-type alloys was investigated. It was found that the respective replacement of Ni in nanocrystalline TiNi by Zr improved not only the discharge capacity but also the cycle life of these electrodes. |
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