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Energies 2017, 10(11), 1741; doi:10.3390/en10111741

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

1
Department of Mechanical and Mechatronics Engineering and Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Ave. W., Waterloo, ON N2L 3G1, Canada
2
Faculty of New Technologies and Chemistry, Military University of Technology, 2 Kaliskiego Str., 00-908 Warsaw, Poland
3
Faculty of Materials Science and Engineering, Graphene Laboratory, Warsaw University of Technology, Warynskiego 1, 00-645 Warsaw, Poland
*
Author to whom correspondence should be addressed.
Received: 4 October 2017 / Revised: 24 October 2017 / Accepted: 27 October 2017 / Published: 30 October 2017
(This article belongs to the Section Energy Storage and Application)
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Abstract

A non-stoichiometric, amorphous a-Mn(BH4)(2x) hydride, accompanied by a NaCl-type salt, was mechanochemically synthesized from the additive-free mixture of (2NaBH4 + MnCl2), as well as from the mixtures containing the additives of ultrafine filamentary carbonyl nickel (Ni), graphene, and LiNH2. It is shown that both graphene and LiNH2 suppressed the release of B2H6 during thermal gas desorption, with the LiNH2 additive being the most effective suppressor of B2H6. During solvent filtration and extraction of additive-free, as well as additive-bearing, (Ni and graphene) samples from diethyl ether (Et2O), the amorphous a-Mn(BH4)(2x) hydride transformed into a crystalline c-Mn(BH4)2 hydride, exhibiting a microstructure containing nanosized crystallites (grains). In contrast, the LiNH2 additive most likely suppressed the formation of a crystalline c-Mn(BH4)2 hydride during solvent filtration/extraction. In a differential scanning calorimeter (DSC), the thermal decomposition peaks of both amorphous a-Mn(BH4)(2x) and crystalline c-Mn(BH4)2 were endothermic for the additive-free samples, as well as the samples with added graphene and Ni. The samples with LiNH2 exhibited an exothermic DSC decomposition peak. View Full-Text
Keywords: ball milling; mechanochemical activation synthesis of NaBH4 and MnCl2; amorphous a-Mn(BH4)2-type; graphene; filamentary Ni and LiNH2 additives on desorption; diborane suppression; solvent filtration/extraction; crystalline c-Mn(BH4)2; gas desorption behavior ball milling; mechanochemical activation synthesis of NaBH4 and MnCl2; amorphous a-Mn(BH4)2-type; graphene; filamentary Ni and LiNH2 additives on desorption; diborane suppression; solvent filtration/extraction; crystalline c-Mn(BH4)2; gas desorption behavior
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MDPI and ACS Style

Varin, R.A.; Mattar, D.K.; Polanski, M.; Bidabadi, A.S.; Stobinski, L. The Effects of Additives on the Dehydrogenation of Amorphous Manganese Borohydride and Its Crystalline Form after Solvent Filtration/Extraction. Energies 2017, 10, 1741.

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