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.
|Number of pages||4|
|Journal||Light Metals: Proceedings of Sessions, TMS Annual Meeting (Warrendale, Pennsylvania)|
|Publication status||Published - 2001 Dec 1|
|Event||Light Metals 2001 - New Orleans, LA, United States|
Duration: 2000 Feb 11 → 2000 Nov 15
ASJC Scopus subject areas
- Metals and Alloys