Influence of the Valve Metal Oxide on the Properties of Ruthenium Based Mixed Oxide Electrodes: II . Coatings

Depth profiling of mixed oxide coatings supported on titanium foil, was performed by means of Rutherford backscattering spectrometry and x‐ray photoelectron spectroscopy. Results of the two techniques indicate the occurrence of surface segregation of the valve‐metal oxide and a general enrichment with it across the first 100–150 nm. The segregation phenomenon takes place for all of the coating compositions investigated. However, it seems less pronounced for Ru contents higher than 60 a/o. The nature of the ruthenium salt used in the coating preparation seems to affect the extent of the surface enrichment.