Hydrogenation/dehydrogenation performances of the MgH₂-WS₂ composites

Abstract

The hydrogenation/dehydrogenation kinetics and thermodynamic behaviors of the MgH₂- WS₂ composites were investigated. The TPD (Temperature-Programmed-Desorption) curves showed that the onset dehydrogenation temperature of the MgH₂ + 20wt% WS₂ composite was 615 K, 58 K lower than that of the pristine MgH₂. The kinetic measurements showed that within 21 min, the MgH₂ + 20wt% WS2 composite could absorb 2.818wt% at 423 K, and release 4.244 wt% of hydrogen at 623 K, while the hydriding/dehydriding capacity of MgH₂ reached only 0.979wt% and 2.319wt% respectively under identical conditions. The improvement of hydrogenation/dehydrogenation performances for the composite was attributed to the cocatalytic effect between the new phases W and MgS which formed during the ball-milling process.

Keywords

MgH₂ / WS₂ / hydrogen storage composite / co-catalytic

References

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