An electroanalytical study of electrode reactions on carbon anodes during electrolytic production of aluminum

Komin Shu, Donald R. Sadoway

Research output: Contribution to journalConference articlepeer-review

24 Citations (Scopus)

Abstract

In connection with the electrolytic production of aluminum the anodic reactions have been studied on carbon microelectrodes by voltammetry and chronoamperometry. Anode gases have been analyzed by gas chromatography on-line during controlled-potential electrolysis in a laboratory-scale aluminum reduction cell. When the voltage exceeds a critical value (about 3 V vs Al/Al3+), the cell current drops precipitously. We attribute this to the formation of a highly resistive film on the surface of the anode. The existence of this putative film was shown to be strictly potential dependent - the film could be formed and removed at will by regulation of applied potential. The rate of PFC generation was found to vary with the magnitude of the anodic overpotential. A PFC reduction strategy that takes into account the design of the power supply is proposed.

Original languageEnglish
Pages (from-to)257-263
Number of pages7
JournalLight Metals: Proceedings of Sessions, TMS Annual Meeting (Warrendale, Pennsylvania)
Publication statusPublished - 2000 Dec 1
Externally publishedYes
EventLight Metals 2000 - Nashville, TN, United States
Duration: 2000 Mar 122000 Mar 16

ASJC Scopus subject areas

  • Metals and Alloys

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