Influence of mass transfer and electrolyte composition on anodic oxygen evolution in molten oxides

TitleInfluence of mass transfer and electrolyte composition on anodic oxygen evolution in molten oxides
Publication TypeJournal Article
Year of Publication2016
AuthorsCaldwell, AH, Lai, E, Gmitter, AJ, Allanore, A
JournalElectrochimica Acta
Volume219
Pagination178 - 186
Date Published2016/11/20/
ISBN Number0013-4686
Keywordsac voltammetry, impedance, iridium, molten oxides, oxygen evolution, rotating electrode, silicates, slag
Abstract

The electrochemistry of anodic oxygen evolution on iridium in silicate-containing molten oxides at 1570 degrees C was experimentally investigated using both direct and alternating current methods. Static and rotating electrode results show the presence of anodic reactions of iridium in addition to oxygen evolution. In the context of electrochemical engineering of molten oxide electrolysis, the results confirm prior theoretical calculations (Allanore, 2013) that suggested an essential role of convection and electrolyte composition on the ability to sustain oxygen evolution at high current densities. In addition, the reported results show that electrochemical measurements in molten oxides coupled with mass-transfer models are complementary characterization tools for oxygen chemistry. (C) 2016 Elsevier Ltd. All rights reserved.

Short TitleElectrochim. Acta