HYDRIDING CHARACTERISTICS OF SURFACE-TREATED MG2NI AT 40-DEGREES-C

The effect of treatment with a fluorine-containing aqueous solution on the hydrogen sorption properties of Mg2Ni has been investigated. The treated Mg2Ni was found capable of being activated and partially hydri ded at near room temperature under moderate pressure conditions. Maxim um hydrogen capacity after 5 h was about 30% of that of Mg2NiH4, i.e., Mg2NiH1.2. This capacity neither increased nor decreased with repeate d hydriding/dehydriding cycles. The F-treatment results in a new fluor inated surface. This new surface exhibits a strong affinity for hydrog en uptake and a higher resistance to impurities.