Molten Salt Electrochemistry

Molten salt electrochemistry runs at temperatures where conventional aqueous and organic electrolytes break down, opening reactions that no other medium supports. The discipline studies charge transfer in ionic liquids in their high-temperature, fully-molten state — alkali and alkaline-earth halides, carbonates, nitrates, hydroxides, and their eutectic blends — typically between roughly 250 and 1000 degrees Celsius. Researchers in this field work on reactive-metal electrowinning (lithium, magnesium, aluminum, rare earths, uranium), pyroprocessing of spent nuclear fuel, molten carbonate fuel cells, liquid-metal batteries, high-temperature thermal-energy storage, and electrochemical reduction of solid oxides via the FFC-Cambridge route.

Core experimental techniques include cyclic voltammetry, chronopotentiometry, square-wave voltammetry, and electrochemical impedance spectroscopy carried out inside sealed cells under inert atmosphere, almost always in argon-filled gloveboxes coupled to controlled-atmosphere tube or crucible furnaces. Reference electrodes are typically Ag/AgCl in chloride melts or platinum quasi-references in carbonate and fluoride melts. Working and counter electrodes are commonly tungsten, molybdenum, glassy carbon, or noble metals chosen to survive the melt chemistry, and crucibles are graphite, alumina, boron nitride, or pyrolytic-graphite-lined depending on melt corrosivity.

Supporting materials and equipment for molten-salt experiments — high-purity salts, refractory crucibles, high-temperature electrodes, gloveboxes, and tube furnaces — are distributed across the rest of the catalog rather than concentrated in this section.