Voltammetric and Chronopotentiometric Study of Nonstationary Processes at the Oxygen-Evolving Anodes in KF–NaF–AlF&lt;sub&gt;3&lt;/sub&gt;–Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; Melt

Suzdaltsev, Andrey; Khramov, A. P.; Ковров, В. А.; Limanovskaya, O. V.; Nekrasov, V. N.; Zaikov, Yu. P.

doi:10.4028/www.scientific.net/msf.844.19

Cited by 4 publications

(6 citation statements)

References 11 publications

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“…The values of sum overvoltages at the current densities, ranging from 0.5 to 1.0 A cm −2 , were 0.4-0.5 and 0.2-0.3 V, respectively. This difference can be explained by a 32,39 and gas bubbles radius.…”

Section: Resultsmentioning

confidence: 97%

Towards the Stability of Low-Temperature Aluminum Electrolysis

Suzdaltsev

Nikolaev

Zaikov

2021

J. Electrochem. Soc.

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The results of several different tests related to the low-temperature aluminum electrolysis were considered in this work. The role of mass transfer processes in the anode-cathode space was recommended to be significant during electrolysis in the low-temperature KF-AlF3 and NaF-AlF3-based melts. The stationary polarization and voltammetry methods were applied in order to study the kinetics of the electrode processes on the carbon and metal electrodes in the KF-AlF3-Al2O3 melts and to select the electrolysis parameters. The schemes of electrode processes were suggested on the basis of electrochemical tests, the flows of substances in the anode-cathode distance were analyzed and the main reasons of the cathode current efficiency decrease during the low-temperature electrolysis in the KF-AlF3-Al2O3 and KF-NaF-AlF3-Al2O3 melts were discussed. It was revealed that the cathode current density should not exceed 0.4–0.55 A cm−2 during the electrolysis at 750 °C–800 °C.

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Section: Resultsmentioning

confidence: 97%

Towards the Stability of Low-Temperature Aluminum Electrolysis

Suzdaltsev

Nikolaev

Zaikov

2021

J. Electrochem. Soc.

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“…The anodic processes on glassy carbon and platinum, as well as degradation processes on oxygen-evolving anodes in low-melting NaF-AlF3-Al2O3 and KF-AlF3-Al2O3 systems are discussed in [2][3][4][5][34][35][36][37][38]. On the basis of resource tests, it was shown that lowering the temperature to 750-800 °C favourably affects the corrosion resistance of oxygen-evolving anodes, and the study of the anodic process on them seems relevant.…”

Section: Anodic Processmentioning

confidence: 99%

“…The experiments and theoretical modelling of the process on platinum anodes during the electrolysis of the KF-AlF3-Al2O3 melts are presented in [35,36]. Fig.…”

Section: Anodic Processmentioning

confidence: 99%

“…Based on the results of a comparative analysis of experimental data and theoretical calculations, it was concluded that the process under study includes the stage of formation of an intermediate oxide compound on the surface of platinum with its subsequent physical and electrochemical decomposition [35]. In stationary mode the limiting current of oxygen evolution on platinum reaches 2 A cm -2 [36] in the KF-NaF-AlF3-Al2O3 melt ((…”

Section: Anodic Processmentioning

confidence: 99%

“…. Voltammograms recorded on platinum in the saturated 1.3(KF-NaF)-AlF3-Al2O3 melt under argon (Ar) and oxygen (O2) atmosphere at 750 and 780 °C (sweep rate -0.1 V s -1 )[36]…”

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confidence: 99%

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Electrolysis of Low-temperature Suspensions: An Update

Yasinskiy

Suzdaltsev

Padamata

et al. 2020

The Minerals, Metals &Amp; Materials Series

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Among different "novel" technologies for eco-friendly aluminium production with zero greenhouse gas emissions, the electrolysis of alumina suspension (or slurry) based on halide melts deserves more attention than it got recently. The original idea of the slurry was first proposed by Theodor R. Beck and has been modified and developed basically by Petr V. Polyakov. This paper presents a comprehensive analysis of the current status of this technology, future opportunities, and the new experimental results, which have not been published yet. This overview covers the properties of high-temperature suspensions, including sedimentation behaviour and apparent electrical conductivity; anodic process on oxygen-evolving electrodes, including the polarization characteristics and the bubble behaviour at vertical anodes; cathodic process on wettable substrates; primary electrolysis results; and the general considerations touching upon the possible cell designs and the thermal balance. The future scope of the technology and possible applications are discussed.

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