| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Materials and Chemistry for Molten Salt Systems
|
| Presentation Title |
Understanding the speciation of molten iodide salts via spectro-electrochemistry |
| Author(s) |
Stephanie Castro Baldivieso, Alejandro Ramos Ballesteros, Ruchi Gakhar, Gregory P. Holmbeck |
| On-Site Speaker (Planned) |
Stephanie Castro Baldivieso |
| Abstract Scope |
Iodine is a high yield fission product of concern for the environmental effects due to its high volatility and biological impacts to the human body. Iodine speciation in molten salts, specifically iodide salts, is not well understood due to its reactivity at higher temperature domains. UV-Vis spectroscopy indicates a change in the speciation of the molten iodide salts starting at 500<sup>o</sup>C based on the decomposition of the salt itself, forming I<sub>3</sub><sup>-</sup> ions. This work investigated the spectral changes of I<sup>-</sup> ions in molten LiI-KI and LiI-KI-NiI<sub>2</sub> while manipulating the salts electrochemically using an inert graphite electrode at 400<sup>o</sup>C.The Li<sup>+</sup>/Li(s) and the Ni<sup>2+</sup>/Ni(s) transitions were studied using cyclic voltammetry, chronoamperometry/chronopotentiometry to characterize the respective reduction-oxidation waves. As cyclic voltammetry was applied, the UV-Vis spectroscopy showed a change in the characteristic signal of molten LiI-KI, indicating a disproportionation reaction in the molten salt, leading to formation of I<sub>3</sub><sup>-</sup> ions and I<sub>2</sub> gas. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Pyrometallurgy, Environmental Effects, Nuclear Materials |