Ruthenium Palladium Oxide-coated Titanium Anodes for Low-current-density Oxygen Evolution

Editor(s)

Savinell, Robert

Abstract

A coating composition, ruthenium-palladium oxide, for use on titanium anodes for low-current-density oxygen evolution is presented. Coated titanium anodes hold the promise of producing higher-purity deposits with less power consumption in primary metal electrowinning, but their cost and long-term stability have limited their commercial acceptance. A coating based on stabilized RuO2 with another precious metal, Pd, has been commercially demonstrated, but limited information regarding its structure, electrochemical activity, and stability has been published. In this study, the structure, properties, and stability of various compositions of RuO2-PdOx coatings are reported. These coatings exhibit a compact mud-cracked surface. X-ray diffraction indicates the presence of two separate phases, (Ru,Pd)O2 and PdO , within the coating. The electrochemical activities of the coatings are similar to RuO2(75)-TiO2(25) , and the stability of these coatings as determined by accelerated life testing is at least four times better than RuO2-TiO2 .

Department(s)

Materials Science and Engineering

Keywords and Phrases

Coatings; Electrochemical Electrodes; Palladium Compounds; Ruthenium Compounds; Surface Structure; Titanium; X-Ray Diffraction

International Standard Serial Number (ISSN)

0013-4651

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2008 The Electrochemical Society (ECS), All rights reserved.

Publication Date

01 Jan 2008

Link to Full Text

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