A chronoamperometric study of anodic processes at various types of carbon anode in AL2O3-Na3AlF6 melts used in the electrolytic production of aluminium

The performance of four graphites and glassy carbon as sensor anode materials in chronoamperometry experiments for the determination of Al2O3 in alumina:cryolite melts was investigated. With graphite anodes the anode processes were not fully diffusion controlled, nor were the results adequately repr...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 1994, Vol.141 (8), p.2103-2107
Main Authors: DJOKIC, S. S, CONWAY, B. E, BELLIVEAU, T. F
Format: Article
Language:English
Subjects:
Chemistry
Electrochemistry
Electrodes: preparations and properties
Exact sciences and technology
General and physical chemistry
Ion selective electrodes
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Summary:The performance of four graphites and glassy carbon as sensor anode materials in chronoamperometry experiments for the determination of Al2O3 in alumina:cryolite melts was investigated. With graphite anodes the anode processes were not fully diffusion controlled, nor were the results adequately reproducible. The anodic processes were diffusion controlled for glassy carbon anodes, and the relationship of the response current function and Al2O3 concentration was approximately linear. The results were significantly affected by the presence of Al metal. 20 refs.
ISSN:0013-4651
1945-7111
DOI:10.1149/1.2055068