The Effects of Additives on the Dehydrogenation of Amorphous Manganese Borohydride and Its Crystalline Form after Solvent Filtration/Extraction

Robert A. Varin, Deepak K. Mattar, Marek Polanski, Amirreza Shirani Bidabadi and Leszek Stobinski
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Robert A. Varin: Department of Mechanical and Mechatronics Engineering and Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Ave. W., Waterloo, ON N2L 3G1, Canada
Deepak K. Mattar: Department of Mechanical and Mechatronics Engineering and Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Ave. W., Waterloo, ON N2L 3G1, Canada
Marek Polanski: Faculty of New Technologies and Chemistry, Military University of Technology, 2 Kaliskiego Str., 00-908 Warsaw, Poland
Amirreza Shirani Bidabadi: Department of Mechanical and Mechatronics Engineering and Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Ave. W., Waterloo, ON N2L 3G1, Canada
Leszek Stobinski: Faculty of Materials Science and Engineering, Graphene Laboratory, Warsaw University of Technology, Warynskiego 1, 00-645 Warsaw, Poland

Energies, 2017, vol. 10, issue 11, 1-18

Abstract: A non-stoichiometric, amorphous a-Mn(BH 4 ) (2x) hydride, accompanied by a NaCl-type salt, was mechanochemically synthesized from the additive-free mixture of (2NaBH 4 + MnCl 2 ), as well as from the mixtures containing the additives of ultrafine filamentary carbonyl nickel (Ni), graphene, and LiNH 2 . It is shown that both graphene and LiNH 2 suppressed the release of B 2 H 6 during thermal gas desorption, with the LiNH 2 additive being the most effective suppressor of B 2 H 6 . During solvent filtration and extraction of additive-free, as well as additive-bearing, (Ni and graphene) samples from diethyl ether (Et 2 O), the amorphous a-Mn(BH 4 ) (2x) hydride transformed into a crystalline c-Mn(BH 4 ) 2 hydride, exhibiting a microstructure containing nanosized crystallites (grains). In contrast, the LiNH 2 additive most likely suppressed the formation of a crystalline c-Mn(BH 4 ) 2 hydride during solvent filtration/extraction. In a differential scanning calorimeter (DSC), the thermal decomposition peaks of both amorphous a-Mn(BH 4 ) (2x) and crystalline c-Mn(BH 4 ) 2 were endothermic for the additive-free samples, as well as the samples with added graphene and Ni. The samples with LiNH 2 exhibited an exothermic DSC decomposition peak.

Keywords: ball milling; mechanochemical activation synthesis of NaBH 4 and MnCl 2; amorphous a-Mn(BH 4 ) 2 -type; graphene; filamentary Ni and LiNH 2 additives on desorption; diborane suppression; solvent filtration/extraction; crystalline c-Mn(BH 4 ) 2; gas desorption behavior (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
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