Hydrogen storage and electrochemical properties of the Ti 0.32Cr0.43-x-yV 0.25FexMny (x = 0-0.055, y = 0-0.080) alloys and their composites with MmNi3.99Al0.29Mn 0.3Co0.6 alloy

Han Gyo Lee, M. G. Chourashiya, Choong Nyeon Park, Chan Jin Park*

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Abstrakt

In this paper, we investigated the hydrogen storage and electrochemical characteristics of the bcc type Ti0.32Cr0.43- x-yV0.25FexMn y (x = 0, 0.03, 0.055; y = 0, 0.03, 0.055, 0.080) alloys and their composites with the AB5 type MmNi3.99Al 0.29Mn0.3Co0.6 (Mm: misch-metal) alloy. The maximum hydrogen capacities of the bcc alloys were proportional to the lattice parameters of the alloys. The increased substitution of Fe/Mn for Cr in the bcc alloys increased the plateau pressure in the respective pressure-composition isotherms. In particular, the plateau pressure was more sensitive to Fe substitution than Mn substitution. Electrochemically, the Ti 0.32Cr0.345V0.25Fe0.03Mn 0.055 composite alloy electrode showed the optimum discharge capacity and cyclability because it had the beneficial effects of both Fe and Mn substitutions. Furthermore, among the other composite alloy electrodes, the Ti0.32Cr0.345V0.25Fe0.03Mn 0.055 composite alloy electrode showed the smallest charge transfer resistance, which allowed its easy activation and, higher rate capability.

OriginalsprogEngelsk
TidsskriftJournal of Alloys and Compounds
Vol/bind566
Sider (fra-til)37-42
ISSN0925-8388
DOI
StatusUdgivet - 2013
Udgivet eksterntJa

Fingeraftryk Dyk ned i forskningsemnerne om 'Hydrogen storage and electrochemical properties of the Ti <sub>0.32</sub>Cr<sub>0.43-x-y</sub>V <sub>0.25</sub>Fe<sub>x</sub>Mn<sub>y</sub> (x = 0-0.055, y = 0-0.080) alloys and their composites with MmNi<sub>3.99</sub>Al<sub>0.29</sub>Mn <sub>0.3</sub>Co<sub>0.6</sub> alloy'. Sammen danner de et unikt fingeraftryk.

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