The effects of filamentary Ni, graphene and lithium amide (LiNH 2 ) additives on the dehydrogenation behavior of mechano-chemically synthesized crystalline manganese borohydride (Mn(BH 4 ) 2 ) and its solvent filtration/extraction

Robert A. Varin , Amirreza Shirani Bidabadi , Marek Polański , Mazda Biglari , Leszek Stobiński

Abstract

Dehydrogenation properties of mechano-chemically synthesized crystalline Mn(BH4)2 hydride without and with ultrafine filamentary carbonyl nickel (Ni), graphene and LiNH2 were investigated. It is reported for the first time that all additives suppressed the release of B2H6 with the filamentary Ni additive being the most effective suppressor of B2H6. In DSC, the decomposition peak of Mn(BH4)2 was endothermic. The estimated apparent activation energy for isothermal dehydrogenation was dramatically reduced to 44.9 ± 4.3 kJ/mol for the 5 wt.% LiNH2 additive from about 76–81 kJ/mol range for the additive-free sample and 5 wt.% filamentary Ni and graphene additives. The most striking finding, that has never been reported in the literature, is that the process of solvent filtration and extraction of the mechano-chemically synthesized (Mn(BH4)2/LiCl) sample, resulted in the crystallization of a dimetallic borohydride solvate [{Li(Et2O)2}Mn2(BH4)5] instead of crystalline Mn(BH4)2. Its dehydrogenation behavior was investigated isothermally and by TGA/DSC.
Author Robert A. Varin
Robert A. Varin,,
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, Amirreza Shirani Bidabadi
Amirreza Shirani Bidabadi,,
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, Marek Polański
Marek Polański,,
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, Mazda Biglari
Mazda Biglari,,
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, Leszek Stobiński (FCPE / GL)
Leszek Stobiński,,
- WUT Grafen Laboratory
Journal seriesMaterials Research Bulletin, ISSN 0025-5408, (A 30 pkt)
Issue year2018
Vol100
Pages394-406
Publication size in sheets0.6
Keywords in Englishhydride hydrogen storage, mechano-chemical activation synthesis, manganese borohydride Mn(BH4)2, additives, solvent filtration/extraction, dehydrogenation behavior
DOIDOI:10.1016/j.materresbull.2017.12.051
URL https://ac.els-cdn.com/S002554081732785X/1-s2.0-S002554081732785X-main.pdf?_tid=spdf-9bd74860-e1c1-45d5-8e1a-4806ad3387e3&acdnat=1519893689_2f07ce9fd0b0e1ed585e36d8da895825
Languageen angielski
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Varin R.A. (i in.) - The effects of....pdf 3.29 MB
Score (nominal)35
ScoreMinisterial score = 30.0, 01-03-2018, ArticleFromJournal
Ministerial score (2013-2016) = 35.0, 01-03-2018, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 2.446 (2) - 2016=2.365 (5)
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