The dissolution behavior of ammonia (NH 3) in a molten LiCl-KCl-CsCl system was studied in order to determine the feasibility of low-energy NH 3 production via electrochemical synthesis in a high temperature molten salt system. In the presence of nitride ion (N 3-), a portion of NH 3 chemically dissolved in the melt as imide (NH 2-) and amide (NH 2 -) anions formed by the reaction between N 3- and NH 3. Although the dissolved NH 2 - anion thermally decomposed to form NH 3 and NH 2- anion, this phenomena may lower the yield of electrochemical NH 3 production. The dissolved NH 3 can be recovered by supplying hydrogen or water vapor to the melt. The anodic reaction between N 3- and H 2 to form NH 3 at a hydrogen gas-diffusion electrode was also examined and the NH 3 yield was estimated. Although the competing N 2 evolution reaction occurred at potentials more positive than 1.2 V vs. Li(I)Li, the conversion of Li 3N approached 70%, following the recovery processes.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Renewable Energy, Sustainability and the Environment
- Surfaces, Coatings and Films
- Materials Chemistry