Bimetallic hydride NaMgH3 is used for the first time as a vehicle to enhance hydrogen release and uptake from LiNH2. The combination of NaMgH3 with LiNH2 at a molar ratio of 1
:2 can release about 4.0 wt% of hydrogen without detectable NH3 emission in the temperature range of 45 °C to 325 °C and exhibiting superior dehydrogenation as compared to individual NaH and/or MgH2 combined with LiNH2. A high capacity retention of about 75% resulting from the introduction of NaMgH3 is also achieved in LiNH2 as well as re-hydrogenation under milder conditions of 180 °C and 5 MPa H2 pressure. These significant improvements are attributed to synergistic effects of in situ formed NaH and MgH2via the decomposition of NaMgH3 where a succession of competing reactions from the cyclic consumption/recovery of NaH are involved and serve as a “carrier” for the ultra-rapid conveyance of the N-containing species between the [NH2]− amide and the resulting [NH]2− imide complexes.
Dalton Transactions
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