Hydrogen absorption experiments were carried out using zirconium (Zr) and titanium (Ti) in the form of a metal sponge, strip and rod to investigate the metal hydride characteristics. The Zr and Ti sponges showed a high hydrogen absorption capacity despite a low reaction temperature. The H/M, which indicates the capacity of hydrogen absorption, was measured at 2.0 for the Zr/Ti sponge at 25 ℃. In the case of the Zr/Ti strip and rod, however, the hydrogen absorption capacity was very low at 25 ℃. The capacity of hydrogen absorption increased with an increase in the reaction temperature. When the Ti strip was not activated, the H/M ratio was measured at 0.58. When the Ti strip was once and twice activated at 800 ℃ for 1 hour, the H/M ratio increased to 1.6 and 1.83, respectively. The hydrogen absorption capacity decreased with the increment of concentration of helium in hydrogen due to a blanketing effect of metal surface by the helium. A pulverizing phenomenon during the metal hydriding was observed in both the Zr/Ti strip and the Zr/Ti rod. However, this pulverizing phenomenon was not observed in the Zr/Ti sponges because of their high surface area.

Hydrogen Absorption Metal Hydriding Immobilization Zirconium Titanium

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