期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 22, 期 39, 页码 21017-21023出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm34766k
关键词
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资金
- Ministry of Science and Technology of China [2010CB631302]
- National Natural Science Foundation of China [51071047]
- PhD Programs Foundation of Ministry of Education of China [20110071110009]
- Science and Technology Commission of Shanghai Municipality [11JC1400700, 11520701100]
- US Department of Energy, Office of Energy Efficiency and Renewable Energy
Novel borohydrides of para- and meta-bis-(ammonium)-benzene (m/p-BABB), possessing theoretical hydrogen storage capacities of 10.1 wt%, have been synthesized upon metathesis of p/m-benzenediamine dihydrochloride (p/m-BDADC) and lithium borohydride through simple ball-milling. It was found that the dehydrogenation of the BABBs proceeds in the temperature range of 50-200 degrees C via a multistep mechanism similar to that of NH3BH3 and [NH4](+)[BH4](-), releasing 8.35 and 6.52 wt% hydrogen from p- and m-BABB, respectively. Solid state B-11 MAS NMR studies indicate that the dehydrogenation process of p-BABB and m-BABB follows a pathway similar to that of [NH4](+)[BH4](-) via [BH2(NH3)(2)](+)[BH4](-) (DADB). The residues obtained after releasing similar to 6 equiv. H-2 are mainly N,N'-phenyl substituted polyborazylenes. The dehydrogenated products can be converted back to N,N'-phenyl substituted ammonia-boranes by treatment with hydrazine sulfate [(N2H4)(2)center dot H2SO4] in liquid ammonia (NH3) for one week at 45 degrees C, demonstrating the potential of this class of material for regenerable chemical hydrogen storage.
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