Insights from impedance spectroscopy into the mechanism of thermal decomposition of M(NH2BH3), M = H, Li, Na, Li0.5Na0.5, hydrogen stores‡

文献情報

出版日 2012-03-20

DOI 10.1039/C2CP23344D

インパクトファクター 3.676

著者

Karol J. Fijalkowski, Rafał Jurczakowski, Wiktor Koźmiński

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要旨

We report the first solid-state impedance study of hydrogen-rich ammonia borane, AB, and its three alkali metal amidoborane derivatives. Temperature-dependent impedance spectra of solid M(NH2BH3) salts are predominated by ionic conductivity, which at room temperature ranges from 5.5 μS cm−1 (M = Li) to 2.2–3.0 mS cm−1 (Na, Na0.5Li0.5), while the activation energy for conductivity is rather high (140–158 kJ mol−1). Variation of conductivity with time can be used to extract information about the evolution of the system during thermal decomposition. By using a combination of impedance spectroscopy, thermogravimetric analysis, scanning calorimetry, evolved gas analysis, infrared absorption spectroscopy as well as 11B and 1H MAS NMR, we were able to reconfirm the complex pathway of thermal decomposition of amidoboranes postulated by two of us earlier (J. Mater. Chem. 2009, 19, 2043).

掲載誌

Physical Chemistry Chemical Physics

CiteScore: 5.5

自己引用率: 10.3%

年間論文数: 3036

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