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1.2<br />
1.0<br />
(a)<br />
(b)<br />
Wt. % H absorbed<br />
0.8<br />
0.6<br />
0.4<br />
0.2<br />
0.0<br />
0 2000 4000 6000 8000 10000 12000<br />
time (s)<br />
Figure 30: Percent hydrogen curves for LaNi 5 with 0.77% Al, hydriding under pure H 2<br />
(a) and 50% (v/v) H 2 -He (b).<br />
The decreased reaction rate of hydrogen uptake of LaNi 5 due to the presence of<br />
helium was previously reported and the rate limiting step was announced to be the<br />
transport of H 2 to the surface of the LaNi 5 [64]. This result was verified in this work.<br />
Supported with the inertness of LaNi 5 with He, the rate limiting step was verified to be<br />
the transport of H 2 from the bulk of the gas phase to the metal gas interface.<br />
66
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