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Electrochemistry of nitrogen and nitrides in molten salts

Authors
Journal
Journal of Nuclear Materials
0022-3115
Publisher
Elsevier
Publication Date
Volume
344
Identifiers
DOI: 10.1016/j.jnucmat.2005.04.030
Disciplines
  • Chemistry
  • Physics

Abstract

Abstract Electrochemical behavior of nitrogen and nitrides in a molten LiCl–KCl–Li 3N system has been investigated from thermodynamic and kinetic point of view. Nitride ions are anodically oxidized to form nitrogen gas almost quantitatively on a nickel electrode according to the following reaction: N 3 - = 1 2 N 2 + 3 e - . This is a reversible one-step three-electron reaction governed by a simple diffusion-controlled charge transfer process. The diffusion coefficient of nitride ion is estimated to be about 1.8 × 10 −5 cm 2 s −1 at 723 K. On the other hand, nitrogen gas is cathodically reduced almost quantitatively to form nitride ions, the reaction of which is expressed as 1 2 N 2 + 3 e - = N 3 - . The standard electrode potential of an N 2/N 3− couple, E N 2 / N 3 - 0 , at 723 K was found to be 0.382 V vs. Li +/Li. Potential-pN 3− diagrams were constructed using E N 2 / N 3 - 0 together with thermochemical data for elements relevant to the electrochemical reprocessing of nitride fuels. The obtained results also enable us to propose new processes such as the electrochemical formation of functional nitride films and the electrochemical synthesis of ammonia gas under ambient pressure.

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