Bradley R. Nakanishi, Antoine Allanore
Limited knowledge of the thermodynamic and transport properties of refractory materials in the liquid state remains a key challenge limiting their application. This study aims to investigate the electrochemical kinetics of oxygen evolution and metal deposition in a pendant droplet of molten alumina (Al2O3) using alternating current (AC) and direct current (DC) techniques with three iridium (Ir) electrodes in a thermal imaging furnace. For the first time, the direct electrolytic decomposition of molten Al2O3 to oxygen gas and aluminum (Al) metal (alloyed with Ir) was observed, confirming the ionic nature of molten Al2O3. High precision measurements of the decomposition potential of molten Al2O3 using AC voltammetry revealed remarkable sensitivity to temperature variations, enabling the assessment of chemical potential and entropy of Al at the Ir-rich solid-liquid phase boundary. These results were in close agreement with the latest thermodynamic assessment of the Al-Ir system, highlighting the significance of this research in advancing the understanding of high temperature materials and their properties.
@article{143e3b91-99fd-4572-bfaa-bc924ae6f761,
title={Electrochemical Study of a Pendant Molte},
author={Bradley R. Nakanishi and Antoine Allanore},
year={2026},
language={en}
}TY - JOUR TI - Electrochemical Study of a Pendant Molte AU - Bradley R. Nakanishi AU - Antoine Allanore PY - 2026 LA - en ER -
Important advances in electrochemical engineering technology over the last three decades have fostered the development of a lternative methods to alle
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