Facile solvent-free synthesis of anhydrous alkali metal dodecaborate M 2B12H12 (M = Li, Na, K)

Liqing He, Hai Wen Li, Son Jong Hwang, Etsuo Akiba

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25 Citations (Scopus)

Abstract

Metal dodecaborate, widely regarded as an obstacle of the rehydrogenation of high-density hydrogen storage materials metal borohydrides M(BH 4)n, is generally synthesized using liquid-phase process followed by a careful dehydration process. In this study, we propose a new and facile solvent-free synthesis process of dodecaborates using B 10H14 with a low melting point of 99.6 °C as a boron source. As a case study, our first challenge focused on the syntheses of anhydrous M2B12H12 (M = Li, Na, and K) by heat treatment of starting materials (a) 2MH + 1.2B10H14 or (b) 2MBH4 + B10H14 at 200-450 °C conditions, which have been proved to be successful for the first time by X-ray diffraction (XRD), Raman, and NMR analysis. Starting materials (b) 2MBH4 + B 10H14 shows better reactivity than that of (a) 2MH + 1.2B10H14, which demonstrates that synthesis of anhydrous M2B12H12 by heat treatment of 2MBH4 + B10H14 is a feasible solvent-free process.

Original languageEnglish
Pages (from-to)6084-6089
Number of pages6
JournalJournal of Physical Chemistry C
Volume118
Issue number12
DOIs
Publication statusPublished - Mar 27 2014

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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