Original scientific paper

Comparative Study of Anodic Behaviour of Electrodeposited Ruthenium, Iridium and Rhodium Coatings on Titanium in Acid Solution

Marijan Vukovìć ; Laboratory of Electrochemistry and Surface Phenomena, Ruđer Bošković Institute, Zagreb, Croatia
Dunja Čukman ; Laboratory of Electrochemistry and Surface Phenomena, Ruđer Bošković Institute, Zagreb, Croatia

Abstract

The electrocatalytic activity and anodic stability of electrodeposited ruthenium, iridium and rhodium coatings on titanium in oxygen evolution reaction from 0.5 mol dm-'! sulphuric acid have been investigated. The vol- tammetric charge of oxide formation was taken as a measure for electro- chemically active surface area. The currents in the Tafel polarization plots were normalized according to these data. Ruthenium exhibited the highest electrocatalytic activity evidenced by the lowest Tafel slope of 30 m V/decade and the highest normalized current density. Anodic galvanostatic polarization, carried out at 0.016 A cm-2 and 1 A cm-2, respectively, proved rhodium to be the most stable coating.

Keywords

Hrčak ID:

137146

URI

https://hrcak.srce.hr/137146

Publication date:

29.1.1993.

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