Abstract
ZrNi hydride has been assessed as reversible hydrogen storage material in actuators of gas gap heat switches for various applications including hydride compressors in closed-cycle Joule–Thomson (J–T) sorption cryocoolers. Three ZrNiH 1.5 samples have been cycled between 280 and 450 K for more than 24,000 cycles to evaluate phase stability and durability of this hydride for conditions simulating device operation. Changes in the hydrogen absorption and desorption were evaluated by measuring the pressure and temperature dynamic relationship during each cycle and by powder X-ray diffraction (XRD) of the material. No significant evidence for degradation was observed although disproportionation had been seen previously when ZrNiH x was heated above 675 K. The resistance of the present samples to degradation is primarily attributed to the lower desorption temperature during cycling.
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