期刊
CHEMISTRY-AN ASIAN JOURNAL
卷 8, 期 9, 页码 2136-2143出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.201300323
关键词
amides; hydrogen storage; kinetics; rubidium; thermodynamics
资金
- Ministry of Science and Technology of China [2010CB631304]
- National Natural Science Foundation of China [51222101, 51025102, 51171170]
- Fundamental Research Funds for the Central Universities [2013QNA4009, 2012XZZX003-8]
- Science and Technology Department of Zhejiang Province [2011R10017, 2010R50013]
The introduction of RbF into the Mg(NH2)2-2LiH system significantly decreased its (de-)hydrogenation temperatures and enhanced its hydrogen-storage kinetics. The Mg(NH2)2-2LiH-0.08RbF composite exhibits the optimal hydrogen-storage properties as it could reversibly store approximately 4.76wt% hydrogen through a two-stage reaction with the onset temperatures of 80 degrees C for dehydrogenation and 55 degrees C for hydrogenation. At 130 degrees C, approximately 70% of hydrogen was rapidly released from the 0.08RbF-doped sample within 180min, and the fully dehydrogenated sample could absorb approximately 4.8wt% of hydrogen at 120 degrees C. Structural analyses revealed that RbF reacted readily with LiH to convert to RbH and LiF owing to the favorable thermodynamics during ball-milling. The newly generated RbH participated in the following dehydrogenation reaction, consequently resulting in a decrease in the reaction enthalpy change and activation energy.
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