A New Complex Borohydride LiAl(BH4)2Cl2

Dolotko, Oleksandr; Kobayashi, Takeshi; Hlova, Ihor Z.; Gupta, Shalabh; Pecharsky, Vitalij K.

doi:10.3390/inorganics9050035

A New Complex Borohydride LiAl(BH4)2Cl2

Journal Article · Tue May 04 00:00:00 EDT 2021 · Inorganics

DOI:https://doi.org/10.3390/inorganics9050035· OSTI ID:2397359

; ; Hlova, Ihor Z.; Gupta, Shalabh; Pecharsky, Vitalij K.

A new mixed alkali metal–aluminum borohydride LiAl(BH4)2Cl2 has been prepared via mechanochemical synthesis from the 2LiBH4–AlCl3 mixture. Structural characterization, performed using a combination of X-ray powder diffraction and solid-state NMR methods, indicates that the LiAl(BH4)2Cl2 phase adopts a unique 3D framework and crystallizes in an orthorhombic structure with the space group C2221, a = 11.6709(6) Å, b = 8.4718(4) Å, c = 7.5114(3) Å. The material shows excellent dehydrogenation characteristics, where hydrogen evolution starts at Tons = 70 °C, releasing approximately 2 wt.% of nearly pure (99.8 vol.%) hydrogen and a very small amount (~0.2 vol.%) of diborane. When compared to halide-free mixed alkali metal–aluminum borohydrides, the presence of Al‒Cl bonding in the LiAl(BH4)2Cl2 structure likely prevents the formation of Al(BH4)3 upon decomposition, thus suppressing the formation of diborane.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Fuel Cell Technologies Office

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 2397359

Alternate ID(s):: OSTI ID: 1783229

Report Number(s):: IS-J--10,474; PII: inorganics9050035

Journal Information:: Inorganics, Journal Name: Inorganics Journal Issue: 5 Vol. 9; ISSN 2304-6740; ISSN INORCW

Publisher:: MDPI AGCopyright Statement

Country of Publication:: Switzerland

Language:: English

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