Fluorine from Caesium Acid Fluoride

Mathers, F. C.; Stroup, P. T.

doi:10.1149/1.3498089

Cited by 9 publications

(5 citation statements)

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“…KF-HF system is used as an electrolyte for electrochemical synthesis of elemental fluorine and many studies have been made on its physical, chemical and electrochemical properties [3][4][5]. A similar application was also examined for CsF-HF system, although it was not applied to industrial electrolysis due to the high cost of CsF [2,6]. The advantage of CsF-HF system is its low melting point compared to KF-HF system which enables the electrolysis to be performed at lower temperatures to save energy and give broader choice of materials of electrolytic cells.…”

Section: Introductionmentioning

confidence: 99%

Cesium fluorohydrogenate, Cs(FH)2.3F

Matsumoto

Ohtsuki

Hagiwara

et al. 2006

Journal of Fluorine Chemistry

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Cs(FH) 2.3 F is a liquid salt exhibiting a low viscosity of 20.1 cP and a high conductivity of 86.3 mS cm À1 at 25 8C, in spite of the relatively high melting point (16.9 8C). The high density of 2.82 g cm À3 at the liquid state is due to the heavy atomic weight and small size of cesium atom compared to the organic cations of general ionic liquids. The infrared spectroscopy indicates that this salt contains (FH) 2 F À as a main anionic species. The other anionic species such as (FH) 3 F À found in the cases of other M + (HF) 2.3 F (M = a univalent organic cation) ionic liquid salts is not detected, suggesting its small abundance as well as the presence of neutral HF in the form of molecular and/or oligomers. The result of 1 H NMR also suggests that the anions exchange HF between them. These observations coincide with the experimental result that Cs(FH) 2.3 F acts as an acid against general ionic liquid fluorohydrogenates such as EMIm(FH) 2.3 F (EMIm = 1-ethyl-3-methylimidazolium) to lose HF and give Cs(FH) 2 F precipitate. #

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Section: Introductionmentioning

confidence: 99%

Cesium fluorohydrogenate, Cs(FH)2.3F

Matsumoto

Ohtsuki

Hagiwara

et al. 2006

Journal of Fluorine Chemistry

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“…[8a,b] An alternative approach reported in 1934 proposed the use of CsF-2HF molten salt electrolyte for F 2 gas generation, including metal fluoride electrolysis. [10] In the full phase diagram of the CsF-HF system reported, the liquidus line was found to drop below room temperature around the composition of CsF-2.45HF,i ndicating the possibility of roomtemperature operations. [11] Although ar eport in 2006 compared the properties of aC sF-2.3HF molten salt with nonvolatile ionic liquid [1-alkyl-3-methylimidazolium][(FH) 2.3 F] showing high ionic conductivity and low HF dissociation pressure in the CsF-2.3HF molten salt, [12] successive reports on this Cs system cannot be found.…”

Section: Introductionmentioning

confidence: 95%

Generation of Elemental Fluorine through the Electrolysis of Copper Difluoride at Room Temperature

et al. 2021

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The safe generation of F2 gas at room temperature by using simple cell configurations has been the “holy grail” of fluorine research for centuries. Thus, to address this issue, we report generation of F2 gas through the electrolysis of CuF2 in a CsF‐2.45HF molten salt without the evolution of H2 gas. The CuF2 is selected through a series of thermodynamic and kinetic assessments of possible metal fluorides. Anode assessments on graphite and glass‐like carbon demonstrate the effect of the absence of the anode during generation of F2 gas owing to stabilized operations at room temperature. Although the Ni anode dissolves during electrolysis in the conventional medium‐temperature cell, herein, it facilitates stable electrolysis over 100 h, achieving an F2 gas purity of over 99 % with the potential to operate using one‐compartment electrolysis. This work presents a safe and propitious method for the generation of high‐purity F2 gas for small‐scale lab and industrial applications.

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“…Application of this fluorohydrogenate salt as an electrolytic bath for elemental fluorine generation was attempted in old days [79], though this electrolytic cell was not industrially applied due to the high cost of the salt.…”

Section: Fluorohydrogenate Ionic Liquidsmentioning

confidence: 99%