Abstract
AbstractHydrogen absorption and desorption kinetics properties of MgH2 were improved by co‐doping of commercial YH2 and a synthesized Carbon supported nano‐Co (Co@C) catalyst, which was prepared by calcination of Zeolitic Imidazolate Framework‐67 (ZIF‐67) precursor. YH2 addition shows great enhancement on the hydrogen absorption kinetics. The ball‐milled MgH2‐YH2 absorbs 6.5 wt.% of hydrogen within 100 s at 300 °C. The Co@C catalyst greatly enhances the absorption and desorption kinetics, while the absorption kinetics is slightly slower than that of MgH2‐YH2 at 250 °C and 275 °C. MgH2‐YH2‐Co@C exhibited prominent absorption and desorption kinetics, reaching full hydrogenation within 150 s at 250 °C and releasing 6 wt.% hydrogen within 1700 s at 300 °C. After hydrogenation and dehydrogenation, particle size of YH3 remains ∼500 nm, and the fine Co@C particles distributed homogeneously in the MgH2 matrix.
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