Nitrogen electrode reaction has been investigated in a LiCl-KCl-CsCl melt containing Li3N. The following 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 nitrogen gas pressure, pN2, of 0.1-1.0 atm and the anion fraction of N3- ion, xN3-, of 0.003-0.020 (anion fraction). Then the standard formal potential of N2/N3-, EN2/N3-0′, is evaluated to be 0.193 ± 0.003 V vs. Li+/Li (pN2 = 1 atm,xN3- = 1) at 673 K. The dependence of EN2/N3-0′ upon the temperature (605-721 K) gives a linear relation, whose slope is (-0.790 ± 0.096) × 10-3 V K-1. Thermodynamic quantities for formation of Li3N in the melt are also estimated.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Renewable Energy, Sustainability and the Environment
- Surfaces, Coatings and Films
- Materials Chemistry