Infrared Spectroscopy of Molten LiCl-KCl-LiH

Nakajima, Hironori; Ito, Yasuhiko

doi:10.1149/1.1664052

Cited by 5 publications

(5 citation statements)

References 33 publications

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“…The band in 1300−1600 cm -1 is therefore ascribed to the vibration of a Li−H interaction. This interaction is reasonable since the vibrational mode of Li−H interaction in a molten LiCl−KCl−LiH system was reported in 1400−1500 cm -1 . The existence of the Li−H interaction shows a strong attractive force between the hydrogen atom and the Li + ion.…”

Section: Resultssupporting

confidence: 61%

“…Figure shows IR spectra of molten LiCl−KCl under hydrogen gas atmosphere when the pressure was decreased. The absorption band around 500 cm -1 is ascribed to the vibration of a short-lived Li−Cl interaction . In Figure , intense absorption bands were observed at 1300−1600 cm -1 for molten LiCl−KCl under hydrogen gas atmosphere (spectra b−d) in contrast to molten LiCl−KCl under vacuum (spectrum a).…”

Section: Resultsmentioning

confidence: 94%

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Infrared Spectroscopy of Molten LiCl−KCl under Hydrogen Gas Atmosphere

Nakajima

Ito

2004

J. Phys. Chem. A

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Infrared spectroscopy of molten LiCl−KCl eutectic melt under several hydrogen pressures at 673 K provided an absorption band in the wavenumber region of 1300−1600 cm-1. This absorption band is ascribed to the vibration of a Li−H interaction in the melt. On the other hand, the absorption bands ascribed to a K−H interaction and H−Cl interaction were not observed. The existence of the Li−H interaction shows a strong attractive force between dissolved hydrogen atoms and Li+ ions in the melt.

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Section: Resultssupporting

confidence: 61%

Section: Resultsmentioning

confidence: 94%

Infrared Spectroscopy of Molten LiCl−KCl under Hydrogen Gas Atmosphere

Nakajima

Ito

2004

J. Phys. Chem. A

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“…17 The absorption due to the interaction between Li + and H ¹ was also reported in molten eutectic LiCl-KCl containing LiH. 12 On the other hand, there is a report that the absorption around 1500 cm ¹1 in molten salts containing hydroxide salts was ascribed to water in the melt. 18…”

Section: Ftir Measurement Of Molten Licl-kcl-csclmentioning

confidence: 87%

“…The IR spectroscopy of molten salts or slags has been investigated by transmission of a metal screen soaked in molten salts, the emission from molten salts, attenuated total reflection (ATR), diffuse reflection of the support materials soaked in molten salts, coagulated powder samples, and so on. [11][12][13][14] The requirements for the IR measurements of molten salts are (1) heating to high temperature over the melting point, T m , (2) holding of a molten liquid sample, (3) the inert environment especially for hygroscopic salts, and (4) a chamber made of corrosion-resistant materials. ATR measurement is generally and successfully used for liquid samples.…”

Section: Introductionmentioning

confidence: 99%

Infrared Spectra of N–H Compounds in LiCl-KCl-CsCl Molten Salts Using the Diffuse Reflectance Optical System

Serizawa

Takei

Nishikiori³

et al. 2018

Electrochemistry

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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 (NH 2− ) and amide (NH 2 − ) anions in the melt containing Li 3 N changed during supplying H 2 gas because of the progress of the protonation reactions of these anions to form NH 3 . 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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“…The hydride ion is predominantly surrounded by Li þ in the electrolyte [14]. It is likely that Li þ is also adsorbed to the surface.…”

Section: Reaction Gibbs Energies Of the Anode Surface Of H 2 |Znmentioning

confidence: 99%

The Surface Adsorption of Hydride Ions and Hydrogen Atoms on Zn Studied by Electrochemical Impedance Spectroscopy with a Non-Equilibrium Thermodynamic Formulation

Nakajima¹,

Ito²,

Kjelstrup³

et al. 2006

Journal of Non-Equilibrium Thermodynamics

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We show that non-equilibrium thermodynamics theory for surfaces combined with electrochemical impedance spectroscopy can be used to derive the excess surface concentrations of reactants and products of an electrochemical reaction at an electrode. We predict the equivalent circuit for a postulated reaction using this theory, and derive expressions for the excess surface concentrations. The method is illustrated with experimental data for the following hydride reaction to hydrogen at a Zn anode in a molten eutectic mixture of LiCl and KCl at 673 K:The results support a two-step mechanism for hydrogen evolution via the hydrogen atom. We calculate the excess surface concentrations of the hydride ions and the hydrogen atoms at the metal surface, and find that the hydride ions cover a fraction of the surface while the hydrogen atoms are present in large excess. The excess surface concentration of the hydride ions varies largely with the polarized state of the surface, and so does its mean activity coe‰cient at the surface. The results contribute to a better understanding of the system in question. The method is general and is expected to give similar information for other electrodes.Brought to you by | University of Arizona Authenticated Download Date | 6/3/15 11:55 AM 232H. Nakajima et al.

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Infrared Spectroscopy of Molten LiCl-KCl-LiH

Cited by 5 publications

References 33 publications

Infrared Spectroscopy of Molten LiCl−KCl under Hydrogen Gas Atmosphere

Infrared Spectroscopy of Molten LiCl−KCl under Hydrogen Gas Atmosphere

Infrared Spectra of N–H Compounds in LiCl-KCl-CsCl Molten Salts Using the Diffuse Reflectance Optical System

The Surface Adsorption of Hydride Ions and Hydrogen Atoms on Zn Studied by Electrochemical Impedance Spectroscopy with a Non-Equilibrium Thermodynamic Formulation

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