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Erschienen in:
2016 | OriginalPaper | Buchkapitel
Electrochemical Behavior of Cermet Anodes in Na3AlF6-K3AlF6-Based Low-Melting Electrolytes for Aluminium Electrolysis
verfasst von : Guihua Wang, Xiaofei Sun
Erschienen in: Light Metals 2013
Verlag: Springer International Publishing
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The anodic behavior of 5Cu/10NiO-90NiFe2O4 cermet in Na3AlF6-K3AlF6-based low-melting electrolytes was investigated for use as inert anodes for aluminium electrolysis. The electrochemical techniques, cyclic voltammetry and Tafel anodic polarization analysis, were performed to determine the reactions. Two anodic processes were observed at the cermet anodes: dissolution of Cu and oxygen evolution. The activity of anodic oxide films (CuO) on cermet anodes was calculated as 0.15 using values of the reversible potential obtained from the Tafel analysis, which suggested a lack of surface oxide stabilization. The exchange current density obtained for cermet anodes was 0.19 A cm-2. The porous surface caused by the depletion of Cu during anodic polarization could be the reason for blocking the oxygen evolution on cermet anodes.