Ruthenium Palladium Oxide-coated Titanium Anodes for Low-current-density Oxygen Evolution
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 .
P. Shrivastava and M. S. Moats, "Ruthenium Palladium Oxide-coated Titanium Anodes for Low-current-density Oxygen Evolution," Journal of The Electrochemical Society, The Electrochemical Society (ECS), Jan 2008.
The definitive version is available at http://dx.doi.org/10.1149/1.2917206
Materials Science and Engineering
Keywords and Phrases
Coatings; Electrochemical Electrodes; Palladium Compounds; Ruthenium Compounds; Surface Structure; Titanium; X-Ray Diffraction
Article - Journal
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