Abstract
A Ni 3Al intermetallic compound was added to the cathode to decrease the solubility of Ni in a Li/K eutectic molten salt. The solubility of Ni/Ni 3Al used as a cathode was examined by measuring the concentrations of Ni and Al ions in alkali metal carbonate. The electrolyte consisted of a mixture of lithium carbonate and potassium carbonate (62Li 2CO 3–38K 2CO 3) at 650 °C. A significant decrease in Ni precipitation was observed over a long term operation using a Ni/(4%, 7%, 10%) Ni 3Al stabilized cathode. Al is easily oxidized and forms an Al 2O 3 film on the surface. This Al 2O 3 film can inhibit corrosion of the electrode. The solubility of the Ni–Al oxidized electrodes containing Ni 3Al and NiO decreased with increasing amounts of Ni 3Al added and with increasing sintering temperature. The solubility decreased to 1.57 ppm, which is 1/10 that of the pure NiO cathode.
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