Determination of Nitride Ion Electrochemically Produced in a Molten Chloride System by Ion Chromatography

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The cathodic reduction of nitrogen (N₂) gas in molten chloride was investigated using a porous nickel (Ni) electrode. A LiCl-KCl-CsCl melt containing cathodically formed nitride ion (N³⁻) was sampled from an electrolytic bath and analyzed quantitatively by ion chromatography. The current efficiency of the cathodic reaction calculated from the ratio of quantity of the produced N³⁻ was approximately 78% on average. The main reason why the measured efficiency did not reach 100% is considered as the amount of N³⁻ increased more in the pores of the gas electrode than in the bulk of the electrolytic bath.