Electrochemistry
Online ISSN : 2186-2451
Print ISSN : 1344-3542
Articles
Infrared Spectra of N–H Compounds in LiCl-KCl-CsCl Molten Salts Using the Diffuse Reflectance Optical System
Nobuyuki SERIZAWAKatsuhito TAKEITokujiro NISHIKIORIYasushi KATAYAMAYasuhiko ITO
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ジャーナル オープンアクセス

86 巻 (2018) 2 号 p. 88-91

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The in-situ Fourier transform infrared spectroscopy of molten eutectic LiCl-KCl-CsCl was conducted in order to identify the dissolved ions in the molten salt electrolytes. The transflectance spectrum of the melts could be easily obtained at temperatures higher than 350°C using the commercially available diffuse reflectance optical system and an air-tight chamber with a built-in heater. The sharp absorption peak attributable to the stretching vibration of OH was observed in the melt containing LiOH, indicating the availability of identification of dissolved species in the melts. The intensities of transflection possibly assignable to N–H bonds in imide (NH2−) and amide (NH2) anions in the melt containing Li3N changed during supplying H2 gas because of the progress of the protonation reactions of these anions to form NH3. The in-situ analysis of the dissolved ions in the melts under the reaction conditions by infrared spectroscopy with the diffuse reflectance optical system can be a simple and powerful tool for understanding the reaction mechanism.

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© 2018 The Electrochemical Society of Japan
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