Abstract
MgH 2+10%MF 3 (M=Ti, Fe) (mass fraction) composites were prepared by ball-milling in hydrogen atmosphere, and their hydrogen storage behaviors and microstructure were investigated systematically. The results show that the hydriding and dehydriding kinetics of MgH 2 are markedly improved by doping TiF 3 and FeF 3 fluorides. At 573 K, the two composites can absorb 5.67%-6.07% (mass fraction) hydrogen within 5 min under an initial hydrogen pressure of 3.5 MPa, and desorb 5.34%-6.02% hydrogen within 6 min. Furthermore, the composites can absorb hydrogen rapidly in moderate temperature range of 313-473 K. In comparison, TiF 3-doped sample has a better hydriding-dehydriding kinetics than FeF 3-doped sample. The microstructure analysis shows that some active particles including MgF 2, TiH 2 and Fe could be formed in the hydriding-dehydriding processes of the MF 3-doped composites. From the Kissinger's plot, the apparent activation energies for the hydrogen desorption of the composites are estimated to be 74.1 kJ/mol for TiF 3-doped composite and 77.6 kJ/mol for FeF 3-doped composite, indicating MgH 2 is significantly activated due to the catalytic effect of the doping of MF 3.
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