Characterization of Lifetimes and Mode of Deactivation of Dimensionally Stable Anodes in Current Reverse Applications

Author

F. Elnathan
Michael S. Moats, Missouri University of Science and TechnologyFollow

Abstract

The effect of current reversal on two commercially manufactured electrodes (RuO₂-TiO₂ and IrO₂-Ta₂O₅ coated Ti) in a chloride bearing electrolyte was evaluated. Accelerated lifetimes were found to decrease with increasing current density and increasing reversal frequency. Ru: Ti coated electrodes exhibited longer lifetimes than Ir: Ta coated electrodes even though they had one-third as much precious metal content. Chloride concentration did not affect lifetime in the range examined. Using energy dispersive X-ray spectroscopy (EDS), scanning electron microscopy (SEM) and electrochemical impedance spectroscopy (EIS), the failure mode of the electrodes was determined to be coating dissolution leading ultimately to passivation by the presumed growth of a highly resistive oxide at the coating/substrate interface.

Recommended Citation

F. Elnathan and M. S. Moats, "Characterization of Lifetimes and Mode of Deactivation of Dimensionally Stable Anodes in Current Reverse Applications," Proceedings of the 28th International Mineral Processing Congress (2016, Quebec City, Canada), Canadian Institute of Mining, Metallurgy and Petroleum, Sep 2016.

Meeting Name

28th International Mineral Processing Congress, IMPC 2016 (2016: Sep. 11-16, Quebec City, Canada)

Department(s)

Materials Science and Engineering

Keywords and Phrases

Catalytic titanium anodes; Current reversal; IrO2-Ta2O5; Lifetimes; RuO2-TiO2

International Standard Book Number (ISBN)

978-192687229-2

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2016 TAPPI Press, All rights reserved.

Publication Date

01 Sep 2016