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<p>Strontium boranate (Sr(BH<sub>4</sub>)<sub>2</sub>) has garnered significant interest within the hydrogen storage community due to its relatively high hydrogen content of approximately 6%. The design of reactive hydride mixtures for reversible hydrogen storage requires the availability of reliable thermodynamic data. This article details the synthesis of Sr(BH<sub>4</sub>)<sub>2</sub> using a wet chemical metathesis reaction. Subsequent to this, the heat capacity of Sr(BH<sub>4</sub>)<sub>2</sub> was determined between 1.8&#xa0;K and 550&#xa0;K using two different calorimetric methods. Utilizing these values, the absolute standard entropy at 298.15&#xa0;K was calculated to be S°(298.15&#xa0;K) = (147.1 ± 3.7)&#xa0;J&#xa0;mol<sup>−1</sup>&#xa0;K<sup>−1</sup>.</p>

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Heat capacity and absolute standard entropy of Sr(BH4)2

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年2月28日

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  • Konrad Burkmann,
  • Angus Demmer,
  • Franziska Habermann,
  • Bastian Hansel,
  • Bianca Störr,
  • Jürgen Seidel,
  • Roman Gumeniuk,
  • Martin Bertau,
  • Klaus Bohmhammel,
  • Florian Mertens

摘要

Strontium boranate (Sr(BH4)2) has garnered significant interest within the hydrogen storage community due to its relatively high hydrogen content of approximately 6%. The design of reactive hydride mixtures for reversible hydrogen storage requires the availability of reliable thermodynamic data. This article details the synthesis of Sr(BH4)2 using a wet chemical metathesis reaction. Subsequent to this, the heat capacity of Sr(BH4)2 was determined between 1.8 K and 550 K using two different calorimetric methods. Utilizing these values, the absolute standard entropy at 298.15 K was calculated to be S°(298.15 K) = (147.1 ± 3.7) J mol−1 K−1.