Aluminium dissolution in NaF-AlF3-Al2O3 systems

Sum, E.; Skyllas‐Kazacos, Maria

doi:10.1007/bf01016900

Cited by 16 publications

(9 citation statements)

References 6 publications

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“…The chemical structure of the obtained product was characterized by 1 H NMR spectra. 1 H NMR spectrum of OMS-4 is shown in Fig. 1.…”

Section: Resultsmentioning

confidence: 99%

“…The vanadium redox ow battery (VRB) was pioneered by Skyllas-Kazacos in 1985 (ref. [1][2][3] and has attracted considerable attention as a large-scale energy storage system due to its high energy efficiency, long cycle life, fast response time, and exible design. Now, the global demand for VRB is urgent, but its commercialization process is still heavily hindered by the relatively high cost of the key materials, particularly the ion conducting membrane (ICM).…”

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confidence: 99%

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Novel sulfonated polyimide/polyvinyl alcohol blend membranes for vanadium redox flow battery applications

et al. 2015

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“…The chemical structure of the obtained product was characterized by 1 H NMR spectra. 1 H NMR spectrum of OMS-4 is shown in Fig. 1.…”

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Novel sulfonated polyimide/polyvinyl alcohol blend membranes for vanadium redox flow battery applications

et al. 2015

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“…Reactions between the melt and aluminum.-The reactions between the NaF-AlF 3 melt and Al were extensively investigated, especially from the 1950s to 1980s (Refs. [15][16][17][18][19][20][21][22] for a better understanding and improvement of Al electrowinning. According to the literature, the Al loss in this system is attributable to the formation of the so-called metal fog, which is considered to be dissolved metal, charged species consisting of several atoms and/or ions of low valency.…”

Section: Resultsmentioning

confidence: 99%

Process for Solar Grade Silicon Production by Molten Salt Electrolysis Using Aluminum-Silicon Liquid Alloy

Oishi

Watanabe

Koyama

et al. 2011

J. Electrochem. Soc.

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A new process for solar grade silicon production by molten salt electrolysis has been proposed and its feasibility discussed. This process consists of an electrolysis step of SiO 2 dissolved in a fluoride melt using an aluminum-silicon liquid alloy cathode and a precipitation step of silicon from the liquid alloy. According to the calculation based on literature data, the proposed process has the possibility to produce solar grade silicon in combination with directional solidification, even if the electrolysis step has no purification effect. A preliminary electrolysis using aluminum cathode and carbon anode in a NaF-AlF 3 -SiO 2 melt at 1273 K revealed that silicon was formed by the electrolysis and that sub-reactions, such as the reduction of SiO 2 by aluminum and metal fog formation, also took place. Especially, SiO 2 reduction by aluminum was found to be fast compared to the reduction by the electrolysis, which made it difficult to evaluate the current efficiency. Thus, these sub-reactions were further investigated in order to measure the reaction rates, and their potential dependence. Based on the obtained data, the cathodic current efficiency during the preliminary electrolysis was evaluated to be greater than 46%.

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“…Furthermore, as the concentration of aluminum-containing complex ions varies with the molar ratio of NaF to AlF 3 in the melt, the cryolite ratio of Na 3 AlF 6 -Al 2 O 3 -LiF system surely has some effects on the aluminum deposition and alloying effect. A series of researches [22][23][24][25] already gave about the current efficiency and aluminum dissolution loss in cryolite-aluminum oxide molten salt at tungsten electrode by means of cyclic voltammetry and chronopotentiometry years ago, and introduced reliable theoretical principles for the current aluminum electrolysis as well. However, most of previous studies just focus on the cryolite-aluminum oxide molten salt system, and the electrochemical measurement methods are single.…”

Section: Introductionmentioning

confidence: 99%

Cathodic electrochemical behavior in Na3AlF6-Al2O3-LiF-based melts at tungsten electrode with various cryolite ratios

Tao

Peng

et al. 2014

Rare Met.

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The cathodic behavior at tungsten electrode in Na 3 AlF 6 -Al 2 O 3 -LiF-based melt with various cryolite ratios was investigated by means of potentiodynamic cathodic polarization, potentiostatic electrolysis, chronopotentiometry, and open-circuit chronopotentiometry. The results show that the formation process of Al-W intermetallic compound is controlled by both diffusion and charge transfer when the cryolite ratio is below 2.5, and is completely controlled by diffusion when cryolite ratio is above 2.5. The deposition process of metal aluminum is completely charge-transfer controlled. Sodium vapor releases along with the deposition of metal aluminum as crylite ratio increases, which leads to a great influence on current efficiency. When the cryolite ratio is lower than 2.0, the critical cathodic current density of deposited aluminum at tungsten electrode is about 150 mAÁcm -2 , but the current density is above 200 mAÁcm -2 under other experimental conditions. A higher cryolite ratio can cause a higher cathodic overvoltage. The relative content of Al layer is higher with the decrease of cryolite ratio, and Al layer easily strips into the molten salt when the cryolite ratio is higher than 2.5.

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Aluminium dissolution in NaF-AlF3-Al2O3 systems

Cited by 16 publications

References 6 publications

Novel sulfonated polyimide/polyvinyl alcohol blend membranes for vanadium redox flow battery applications

Novel sulfonated polyimide/polyvinyl alcohol blend membranes for vanadium redox flow battery applications

Process for Solar Grade Silicon Production by Molten Salt Electrolysis Using Aluminum-Silicon Liquid Alloy

Cathodic electrochemical behavior in Na3AlF6-Al2O3-LiF-based melts at tungsten electrode with various cryolite ratios

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