Journal
DALTON TRANSACTIONS
Volume 40, Issue 32, Pages 8179-8186Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1dt10108k
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Funding
- National Basic Research Program of China [2010CB631304]
- National High Technology Research and Development Program of China [2009AA05Z106]
- National Natural Science Foundation of China [51025102, 50871100]
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Hydrogen storage performances of a Li2NH-xMgNH combination system (x = 0, 0.5, 1 and 2) are investigated for the first time. It is found that the hydrogenated samples with MgNH exhibit a significant reduction in the dehydrogenation temperatures. Mechanistic investigations reveal that there is a strong dependence of the hydrogen storage reaction process on the molar ratio between MgNH and Li2NH. As a consequence, tuning of thermodynamics is achieved for hydrogen storage in the Li2NH-xMgNH system by changing the reaction routes, which is ascertained to be the primary reason for the reduction in the operating temperature for hydrogen desorption. Specifically, it is found that under 105 atm hydrogen (140-280 degrees C) 5.6 wt% hydrogen is reversibly stored in the Li2NH-0.5MgNH combination system, which is greater than in the well-investigated Mg(NH2)(2)-2LiH system.
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