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Issue 35, 2016
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The influence of LiH on the rehydrogenation behavior of halide free rare earth (RE) borohydrides (RE = Pr, Er)

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Abstract

Rare earth (RE) metal borohydrides are receiving immense consideration as possible hydrogen storage materials and solid-state Li-ion conductors. In this study, halide free Er(BH4)3 and Pr(BH4)3 have been successfully synthesized for the first time by the combination of mechanochemical milling and/or wet chemistry. Rietveld refinement of Er(BH4)3 confirmed the formation of two different Er(BH4)3 polymorphs: α-Er(BH4)3 with space group Pa[3 with combining macron], a = 10.76796(5) Å, and β-Er(BH4)3 in Pm[3 with combining macron]m with a = 5.4664(1) Å. A variety of Pr(BH4)3 phases were found after extraction with diethyl ether: α-Pr(BH4)3 in Pa[3 with combining macron] with a = 11.2465(1) Å, β-Pr(BH4)3 in Pm[3 with combining macron]m with a = 5.716(2) Å and LiPr(BH4)3Cl in I[4 with combining macron]3m, a = 11.5468(3) Å. Almost phase pure α-Pr(BH4)3 in Pa[3 with combining macron] with a = 11.2473(2) Å was also synthesized. The thermal decomposition of Er(BH4)3 and Pr(BH4)3 proceeded without the formation of crystalline products. Rehydrogenation, as such, was not successful. However, addition of LiH promoted the rehydrogenation of RE hydride phases and LiBH4 from the decomposed RE(BH4)3 samples.

Graphical abstract: The influence of LiH on the rehydrogenation behavior of halide free rare earth (RE) borohydrides (RE = Pr, Er)

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Publication details

The article was received on 28 Jun 2016, accepted on 12 Aug 2016 and first published on 12 Aug 2016


Article type: Paper
DOI: 10.1039/C6CP04523E
Citation: Phys. Chem. Chem. Phys., 2016,18, 24387-24395
  • Open access: Creative Commons BY-NC license
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    The influence of LiH on the rehydrogenation behavior of halide free rare earth (RE) borohydrides (RE = Pr, Er)

    M. Heere, S. H. Payandeh GharibDoust, C. Frommen, T. D. Humphries, M. B. Ley, M. H. Sørby, T. R. Jensen and B. C. Hauback, Phys. Chem. Chem. Phys., 2016, 18, 24387
    DOI: 10.1039/C6CP04523E

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