Thermodynamic investigations of a hydrogen electrode reaction in a molten LiCl-KCl-LiH system

Hironori Nakajima; Toshiyuki Nohira; Yasuhiko Ito

doi:10.1149/1.1462876

Thermodynamic investigations of a hydrogen electrode reaction in a molten LiCl-KCl-LiH system

Hironori Nakajima, Toshiyuki Nohira, Yasuhiko Ito

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13 Citations (Scopus)

Abstract

The equilibrium potential of the H₂/H^- couple has been measured in a molten LiCl-KCl-LiH system at 643-883 K. The Nernst relation holds for the potential at hydrogen pressure, p_H2, of 0.1-1.0 atm and H^- ion concentration, X_H-, of 0.002-0.080 (anion fraction). The standard formal potential of H₂/H^-, E_H2/H- ^0′, is evaluated to be 0.258 ± 0.002 V (vs. Li⁺/Li) (p_H2 = 1 atm, X_H- = 1) at 673 K. E_H2/H- ^0′ changes linearly with temperature at 643-883 K, having the gradient of -0.575 ± 0.011 mV K^-1. Thermodynamic quantities for formation of LiH in the melt are also estimated. When the activity coefficient of H^- ion, γ_H-, is defined as unity in pure liquid LiH (X_H- = 1), γ_H- in the dilute H^- region (0.002 ≤ X_H- ≤ 0.080) is evaluated to be 7.1.

Original language	English
Journal	Electrochemical and Solid-State Letters
Volume	5
Issue number	5
DOIs	https://doi.org/10.1149/1.1462876
Publication status	Published - May 2002
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electrochemistry
Materials Science(all)

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title = "Thermodynamic investigations of a hydrogen electrode reaction in a molten LiCl-KCl-LiH system",

abstract = "The equilibrium potential of the H2/H- couple has been measured in a molten LiCl-KCl-LiH system at 643-883 K. The Nernst relation holds for the potential at hydrogen pressure, pH2, of 0.1-1.0 atm and H- ion concentration, XH-, of 0.002-0.080 (anion fraction). The standard formal potential of H2/H-, EH2/H- 0′, is evaluated to be 0.258 ± 0.002 V (vs. Li+/Li) (pH2 = 1 atm, XH- = 1) at 673 K. EH2/H- 0′ changes linearly with temperature at 643-883 K, having the gradient of -0.575 ± 0.011 mV K-1. Thermodynamic quantities for formation of LiH in the melt are also estimated. When the activity coefficient of H- ion, γH-, is defined as unity in pure liquid LiH (XH- = 1), γH- in the dilute H- region (0.002 ≤ XH- ≤ 0.080) is evaluated to be 7.1.",

author = "Hironori Nakajima and Toshiyuki Nohira and Yasuhiko Ito",

year = "2002",

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doi = "10.1149/1.1462876",

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journal = "Electrochemical and Solid-State Letters",

issn = "1099-0062",

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T1 - Thermodynamic investigations of a hydrogen electrode reaction in a molten LiCl-KCl-LiH system

AU - Nakajima, Hironori

AU - Nohira, Toshiyuki

AU - Ito, Yasuhiko

PY - 2002/5

Y1 - 2002/5

N2 - The equilibrium potential of the H2/H- couple has been measured in a molten LiCl-KCl-LiH system at 643-883 K. The Nernst relation holds for the potential at hydrogen pressure, pH2, of 0.1-1.0 atm and H- ion concentration, XH-, of 0.002-0.080 (anion fraction). The standard formal potential of H2/H-, EH2/H- 0′, is evaluated to be 0.258 ± 0.002 V (vs. Li+/Li) (pH2 = 1 atm, XH- = 1) at 673 K. EH2/H- 0′ changes linearly with temperature at 643-883 K, having the gradient of -0.575 ± 0.011 mV K-1. Thermodynamic quantities for formation of LiH in the melt are also estimated. When the activity coefficient of H- ion, γH-, is defined as unity in pure liquid LiH (XH- = 1), γH- in the dilute H- region (0.002 ≤ XH- ≤ 0.080) is evaluated to be 7.1.

AB - The equilibrium potential of the H2/H- couple has been measured in a molten LiCl-KCl-LiH system at 643-883 K. The Nernst relation holds for the potential at hydrogen pressure, pH2, of 0.1-1.0 atm and H- ion concentration, XH-, of 0.002-0.080 (anion fraction). The standard formal potential of H2/H-, EH2/H- 0′, is evaluated to be 0.258 ± 0.002 V (vs. Li+/Li) (pH2 = 1 atm, XH- = 1) at 673 K. EH2/H- 0′ changes linearly with temperature at 643-883 K, having the gradient of -0.575 ± 0.011 mV K-1. Thermodynamic quantities for formation of LiH in the melt are also estimated. When the activity coefficient of H- ion, γH-, is defined as unity in pure liquid LiH (XH- = 1), γH- in the dilute H- region (0.002 ≤ XH- ≤ 0.080) is evaluated to be 7.1.

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