Improved Hydrogen Absorption/Desorption Properties of MgH 2 by Co–Catalyzing of YH 2 and Co@C

Hydrogen absorption and desorption kinetics properties of MgH 2 were improved by co‐doping of commercial YH 2 and a synthesized Carbon supported nano‐Co (Co@C) catalyst, which was prepared by calcination of Zeolitic Imidazolate Framework‐67 (ZIF‐67) precursor. YH 2 addition shows great enhancement on the hydrogen absorption kinetics. The ball‐milled MgH 2 ‐YH 2 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 MgH 2 ‐YH 2 at 250 °C and 275 °C. MgH 2 ‐YH 2 ‐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 YH 3 remains ∼500 nm, and the fine Co@C particles distributed homogeneously in the MgH 2 matrix.