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Saltykova, N. A.; Semerikova, O. L.; Kosikhin, L. T.

doi:10.1023/a:1012362828341

Cited by 3 publications

(2 citation statements)

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“…There are several models describing transients influenced by nucleation based on constant potential steps [33][34][35]56 but only few based on constant current steps. [57][58][59][60] However, analytical expressions of the nucleation overpotential arising from a current step are not trivial to derive 57 and depend on various parameters, which are difficult to assess. 57,60 The nucleation peak displayed in Fig.…”

Section: S T Is 100 Times Longer Thanmentioning

confidence: 99%

Aluminum Deposition and Dissolution in [EMIm]Cl-Based Ionic Liquids–Kinetics of Charge–Transfer and the Rate–Determining Step

Böttcher

Mai

Ispas

et al. 2020

J. Electrochem. Soc.

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The kinetics of the dissolution and deposition of aluminum from a first generation ionic liquid consisting of AlCl3/1-ethyl-3-methylimidazolium chloride (molar ratio 2:1) was studied. Electrochemical impedance spectroscopy shows that the double layer capacitance and the charge–transfer resistance depend on the state of the electrode surface. The impedance spectra are strongly influenced by mass transport. The rate–determining step of the aluminum deposition, as determined from the cathodic Tafel slope evaluated from current step experiments, was found to be either a chemical step, releasing the complexing agent chloride, while aluminum is in the divalent oxidation state (AlCl3 − → AlCl2 + Cl−) or an electron transfer from the divalent to the monovalent aluminum occurring twice for the overall reaction to occur once (Al2+ + e− → Al+). The rate–determining step for aluminum dissolution was found to be the transfer of an electron from elemental aluminum to the monovalent oxidation state (Al0 → Al+ + e−). A linear slope in the low cathodic overpotential region of the Tafel plot suggests a change in the cathodic rate–determining step. The Tafel slope indicates a chemical step, releasing the complexing agent chloride, after the last electron transfer (AlCl− → Al0 + Cl−) to be the rate–determining step for overpotentials below 50 mV. Density functional theory calculations support the proposed reduction and oxidation mechanisms.

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Section: S T Is 100 Times Longer Thanmentioning

confidence: 99%

Aluminum Deposition and Dissolution in [EMIm]Cl-Based Ionic Liquids–Kinetics of Charge–Transfer and the Rate–Determining Step

Böttcher

Mai

Ispas

et al. 2020

J. Electrochem. Soc.

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“…In addition, the passivation of iridium complex on the surface in molten salt caused by saturation of iridium (III) ions was reported in the previous research. 24,25) This passivation forms a layer on the sample and causes a weight increase, which decreases the dissolution amount.…”

Section: Chlorination and Dissolution Of Iridiummentioning

confidence: 99%

Establishment of a Novel Recycling Process for Iridium Using “Dry Aqua Regia”

Yoshimura,

Komatsuda,

Matsuno

2024

Mater. Trans.

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Iridium is one of the most refractory platinum group metals (PGMs) used in crucibles, catalysts, and ignition tips for spark plugs. Refining and recycling of iridium are energy-intensive processes with high environmental impacts; therefore, a novel recycling process is desirable to expand the utilization of iridium.Previously, we established a novel process for recycling platinum and palladium using "dry aqua regia", which is a molten salt consisting of iron(III) chloride and potassium chloride. This process can recycle PGMs more easily than conventional recycling processes.In this study, we employed "dry aqua regia" for the recycling of iridium. Iridium was dissolved in molten salt and recovered by precipitation using ammonium chloride as the precipitant and nitric acid or hydrogen peroxide as the oxidant. Consequently, it was dissolved by dry aqua regia treatment at 630-670 K, and the dissolved iridium was recovered by precipitation using ammonium chloride and hydrochloric acid with oxidants. The recovery ratio reached 28.3% and 45.7% using nitric acid and hydrogen peroxide, respectively, as oxidants. Based on these findings, we established the fundamental process of recycling iridium using "dry aqua regia".

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Comment and Corrigendum on “Aluminum Deposition and Dissolution in [EMIm]Cl-Based Ionic Liquids—Kinetics of Charge—Transfer and the Rate—Determining Step” [J. Electrochem. Soc.,167, 102516 (2020)]

Böttcher

Mai

Ispas

et al. 2020

J. Electrochem. Soc.

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In the introduction of "Aluminum Deposition and Dissolution in [EMIm]Cl-based Ionic Liquids-Kinetics of Charge-Transfer and the Rate-determining Step" [J. Electrochem. Soc. 167, Vol. 10, 102516 (2020)], paragraph four, we stated, that to our knowledge there are no systematic investigations regarding the rate-determining step of the deposition and dissolution of aluminum from [EMIm] Cl-based ILs. Obviously this statement was not correct.Recently, the work of Wang and Hussey regarding aluminum dissolution in high temperature molten salts 1 and [EMIm]Cl-based room temperature ILs (RTIL) 2 was brought to our attention. The authors investigated the kinetics of the dissolution of aluminum in the respective electrolytes and reported an anodic transfer coefficient α a and an exchange current density j 0 of 0.168 ± 0.006 and 190 mA cm −2 for LiAlBr 4 -NaAlCl 4 -KAlCl 4 (30-50-20 m/o) at 151 °C, 1 respectively and 0.19 ± 0.05 (average) and 0.02 mA cm −2 (average) for [EMIm]Al 2 Cl 7 at 32 °C, 2 respectively.The reported anodic transfer coefficients are close to the one determined in our work (α a = 0.17 ± 0.01). Furthermore, Wang and Hussey stated that this indicates a rate-determining step (RDS) involving neither AlCl 4 − nor Al 2 Cl 7 −

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Cited by 3 publications

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Aluminum Deposition and Dissolution in [EMIm]Cl-Based Ionic Liquids–Kinetics of Charge–Transfer and the Rate–Determining Step

Aluminum Deposition and Dissolution in [EMIm]Cl-Based Ionic Liquids–Kinetics of Charge–Transfer and the Rate–Determining Step

Establishment of a Novel Recycling Process for Iridium Using “Dry Aqua Regia”

Comment and Corrigendum on “Aluminum Deposition and Dissolution in [EMIm]Cl-Based Ionic Liquids—Kinetics of Charge—Transfer and the Rate—Determining Step” [J. Electrochem. Soc.,167, 102516 (2020)]

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