Thermodynamics of the N2/N3- redox couple in a LiBr-KBr-CsBr melt

Katsutoshi Kobayashi, Hironori Nakajima, Takuya Goto, Yasuhiko Ito

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Abstract

Nitrogen electrode reaction has been investigated in a LiBr-KBr-CsBr melt containing Li3N. The reaction N3- → 1/2N2 + 3e- is confirmed by quantitative analysis of anodically evolved gas. The Nernst relation holds for the rest potential of Ni electrodes at a nitrogen gas pressure, pN2, of 0.05-1.0 atm and an anion fraction of the N3- ions, xN3-, of 0.003-0.010 (anion fraction). Then, the standard formal potential of the N2/N3- couple, EN2/N3-, is evaluated to be 0.251 ± 0.009 V versus Li+/Li (pN2 = 1 atm, xN3 = 1) at 673 K. The dependence of EN2/N3- on the temperature (570-730 K) gives a linear relation, whose slope is (-0.930 ± 0.117) × 10-3 V K-1. Thermodynamic quantities for the formation of Li3N in the melt are also estimated.

Original languageEnglish
Pages (from-to)23972-23975
Number of pages4
JournalJournal of Physical Chemistry B
Volume109
Issue number50
DOIs
Publication statusPublished - Dec 22 2005
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry

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