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New hydrogen-rich ammonium metal borohydrides, NH4[M(BH4)4], M = Y, Sc, Al, as potential H2 sources

Abstract

Three metal-ammonium borohydrides: NH4[M(BH4)4] M = Y, Sc, Al, denoted 1, 2, 3, respectively, were prepared via a low temperature mechanochemical synthesis and characterized using PXRD, FTIR and TGA/DSC/MS. The compounds 1 and 2 adopt P21/c space group while the compound 3 crystallizes in an orthorhombic unit cell (Fddd). The first decomposition step of the all three derivatives of ammonium borohydride has the maximum rate at 48 °C, 53 °C and 35 °C, for 1, 2 and 3, respectively, which are comparable to that for NH4BH4 (53 °C). Thermal decomposition of these metal-ammonium borohydrides is a multistep process, with predominantly exothermic low-temperature stages. The compound 1 decomposes via known Y(BH4)3, however, most of the solid decomposition products of the other two compounds have not been fully identified. In the system containing compound 2 a new, more dense polymorph of the previously reported LiSc(BH4)4 has been detected as the intermediate of slow decomposition at room temperature.

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Publication details

The article was received on 18 Oct 2017, accepted on 13 Feb 2018 and first published on 13 Feb 2018


Article type: Paper
DOI: 10.1039/C7DT03926C
Citation: Dalton Trans., 2018, Accepted Manuscript
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    New hydrogen-rich ammonium metal borohydrides, NH4[M(BH4)4], M = Y, Sc, Al, as potential H2 sources

    A. Starobrat, T. Jaroń and W. Grochala, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C7DT03926C

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