Towards elimination of anode effect and PFC emissions via current shunting

Hongmin Zhu, Donald R. Sadoway

Research output: Contribution to journalConference articlepeer-review

6 Citations (Scopus)


Cyclic voltammetry, stepped-current chronopotentiometry, and stepped-potential chronoamperometry on stationary and rotating-disk carbon electrodes have shown that at potentials exceeding ∼3.5 V vs Al/Al3+ in a laboratory cell the current drops off precipitously. Furthermore, if the potential on the anode falls below ∼3.0 V vs Al/Al3+ the current is quickly restored to values it held previously. The mechanism at work is speculated to be a highly resistive surface film whose formation is strictly potential-dependent. To demonstrate the relevance of these findings to industrial operations, controlled-current electrolysis was conducted in a laboratory cell where it was found that the anode effect and, hence, PFC generation can be completely avoided by simply stepping down cell current in small increments, i.e., by several per cent, whenever cell voltage reaches a critical value.

Original languageEnglish
Pages (from-to)303-306
Number of pages4
JournalLight Metals: Proceedings of Sessions, TMS Annual Meeting (Warrendale, Pennsylvania)
Publication statusPublished - 2001 Dec 1
Externally publishedYes
EventLight Metals 2001 - New Orleans, LA, United States
Duration: 2000 Feb 112000 Nov 15

ASJC Scopus subject areas

  • Metals and Alloys


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