Study on hydrogen diffusion behavior in AB5-type hydrogen storage alloys with galvanostatic intermittent titration technique (GITT)

The principle of galvanostatic intermittent titration technique (GITT) is introduced briefly. Hydrogen diffusion behavior in AB5-type hydrogen storage alloys MlNi3.75Co0.65Mn0.4Al0.2 have been electrochemically studied with GITT. The results showed that the hydrogen diffusion coefficient D in the al...

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Bibliographic Details
Published in:Journal of alloys and compounds 2004-12, Vol.385 (1-2), p.90-95
Main Authors: Yuan, Xianxia, Ma, Zi-Feng, Nuli, Yanna, Xu, Naixin
Format: Article
Language:English
Subjects:
AB5-type hydrogen storage alloys
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Galvanostatic intermittent titration technique (GITT)
Hydrogen diffusion coefficient
Physics
Transport properties of condensed matter (nonelectronic)
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Summary:The principle of galvanostatic intermittent titration technique (GITT) is introduced briefly. Hydrogen diffusion behavior in AB5-type hydrogen storage alloys MlNi3.75Co0.65Mn0.4Al0.2 have been electrochemically studied with GITT. The results showed that the hydrogen diffusion coefficient D in the alloys increases with the increase of depth of discharge (DOD) at ambient temperature. For the alloys with 50% DOD, the value of D increases with the increase of temperature, an approximately linear relationship exists between lnD and the reciprocal of the absolute temperature (1/T), and the activation energy for hydrogen diffusion in it has been calculated with Arrhenius equation to be about 21kJmol−1.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2004.04.109