Abstract
The use of hydrogen as a future complementary energy vector is essentially linked to the problem of its storage and transport. Apart from conventional techniques, the storage of hydrogen in metal hydrides is considered of interest for a number of applications. To make a metal hydride a suitable hydrogen storage material, it must exhibit certain characteristics concerning in particular: (i) the hydrogen storage capacity, (ii) the dissociation pressure—temperature relationship, (iii) the heat of reaction, and (iv) the kinetics of hydrogen absorption/desorption. All these data can be determined using a microbalance capable of operating at high temperatures and pressures. The principal item of the thermogravimetric installation developed at Battelle-Geneva consists of a Sartorius balance type 4406 equipped with a heatable autoclave. The attached pressure and temperature control systems allow measurements under conditions of constant pressure (10 −5 Torr to 60 bar) and temperature (15 to 600°C), as well as the execution of pressure and temperature cycling programs at various scanning speeds. The performance and versatility of the instrument is illustrated by measuring various hydrogen sorption characteristics of the known magnesium nickel hydride and iron titanium hydride.
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