Abstract
The electrochemistry of aluminum in liquid ammonia was investigated using potassium amide as supporting electrolyte. Anodic dissolution of the metal in this medium is feasible using a glassy carbon cathode and becomes significant at approximately +2.2 V from solvated electron couple. The dissolution efficiency is limited by the interference of solvated electrons which discharge at the anode. The generation of solvated electrons is one of the cathodic processes and their migration could not be completely prevented in a divided cell. In addition to this, electrodeposition of potassium at the glassy carbon cathode also takes place leading to its eventual catastrophic disintegration. This apparently takes place through the disruption of the glassy carbon structure. The presence of electroactive aluminum species produced in situ by anodic dissolution or added as LiAl(NH/sub 2/)/sub 4/ was detected by means of cyclic voltammetry which revealed the appearance of a cathodic response at about +100 mV from the solvent decomposition limit. 18 refs., 1 fig.