Temperature-Dependent Speciation of Ni(II) in Molten Chloride, Bromide, and Iodide Salts
Journal Article
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· The Journal of Physical Chemistry B
Understanding the fundamental speciation and local structure of metal cations, such as nickel, which is present as a corrosion product, in molten salt media is essential for assessing their impact on the thermal and physical properties of salts used for advanced nuclear energy applications. In this study, we employed an integrated approach of combining X-ray absorption spectroscopy (XAS), UV−vis spectroscopy, and ab initio molecular dynamics (AIMD) to investigate the halide-dependent speciation of divalent nickel ions, Ni(II), in LiCl−KCl, LiBr−KBr, and LiI−KI eutectic salt mixtures from room temperature to 600 °C. Our findings show that both halide type and temperature significantly influence the local coordination of nickel in these molten salt systems. A notable aspect of Ni(II) speciation in LiI−KI salts is the formation of a polyiodide species. Our findings provide critical insights into metal ion speciation in molten salt systems, enhancing our understanding of the factors that govern the physicochemical properties of these complex fluids.
- Research Organization:
- Brookhaven National Lab
- Sponsoring Organization:
- Brookhaven National Lab; USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0012704
- OSTI ID:
- 3013668
- Report Number(s):
- BNL-229334-2026-JAAM
- Journal Information:
- The Journal of Physical Chemistry B, Journal Name: The Journal of Physical Chemistry B Journal Issue: 1 Vol. 130; ISSN 1520-6106
- Country of Publication:
- United States
- Language:
- English
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OSTI ID:3014398