Interfacial Boundary between Carbon Anodes and Molten Salt Electrolyte

The performance of carbon anodes in aluminium production will depend on both the coke quality (impurities, structure) and the physical properties of the anode (density, permeability, electric resistivity). Here, a set of industrial anodes of different porosity and permeability, and a set of pilot scale anodes of different calcined petrol cokes (CPC) were evaluated with respect to the anode potential, voltage oscillations, and double layer capacitance. Electrochemical characterisation of anodes with different permeability showed that the voltage oscillations due to CO2 bubble formation on the horizontal anode surface was inversely correlated to the permeability, with the highest oscillations observed for dense anodes. Evaluating pilot scale anodes with different source CPC (1.4-5.5 wt% S), no significant differences were observed for the overpotential in the absence of bubbles. The anode made from isotropic coke showed a significantly higher double layer capacitance than the anisotropic anodes, indicating better wetting properties towards the electrolyte.

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Electrochemical Performance of Carbon Anodes Made of Bio-pitch as a Binder

Hussein

Wang

Ratvik

et al. 2022

Metall Mater Trans B

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Interfacial Boundary between Carbon Anodes and Molten Salt Electrolyte

Abstract: The properties of calcined petroleum cokes (CPC), used in the anodes in the Hall-Héroult process, are important for the electrochemical behaviour of the anodes. CPCs from different sources vary not only in impurity level but also in microstructure.

Cited by 4 publications

References 13 publications

The Influence of Polarisation on the Wetting of Graphite in Cryolite-Alumina Melts

The Influence of Polarisation on the Wetting of Graphite in Cryolite-Alumina Melts

Optical and Electrochemical Characterisation of Carbon Anodes with Varying Porosity and Coke Quality

Electrochemical Performance of Carbon Anodes Made of Bio-pitch as a Binder

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