Abstract：The crystal structure of ScMn1.6V0.4 alloy and its hydride were studied by XRD, and the hydrogen storage property of the alloy was measured by hydrogen reaction device. The results indicate that: The crystal structure of ScMn1.6V0.4 alloy exhibits an ideal close-packed C14 type hexagonal Laves phase structure. The crystal structure of hydride was the same as that of the original alloy under experimental conditions, and the volume expanded by 28%. The alloy can absorb hydrogen rapidly at 115kPa and 298K, with very short incubation period. The alloy exhibits excellent activation properties. The P-C-T curves of the alloy at different temperatures had no obvious hydrogen absorption and desorption platform. The hysteresis of hydrogen absorption and desorption decreased with the increase of temperature, and the critical hysteresis temperature was 523 K. The ΔH and ΔS of (α+β) phase ranged respectively﹣(29-34) kJ/molH2 and﹣(61-84) J/molH2K obtained by van’t Hoff equation, and the β phase was ﹣(31-33) kJ/molH2 and﹣(87-88) J/molH2K, respectively. The kinetics of hydrogen absorption of the alloy can be described by JMA model. The Avrami index of the (α+β) and β phases of the fully activated powder samples was 1 and 0.5, and the apparent activation energy was 15±1 kJ/mol and 7±2 kJ/mol, respectively. The Avrami index of the first activated block sample was 4 and 1, respectively, with better kinetic performance than that of the powder sample.
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