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In-situ identification of RuO4 as the corrosion product during oxygen evolution on ruthenium in acid media

1984; Elsevier BV; Volume: 172; Issue: 1-2 Linguagem: Inglês

10.1016/0022-0728(84)80187-4

2590-2954

R. Kötz, Samuel Stucki, Daniel A. Scherson, D.M. Kolb,

Corrosion Behavior and Inhibition

The corrosion of ruthenium during oxygen evolution in 0.5 M H2SO4 was investigated using cyclic voltammetry, the rotating ring—disc electrode technique and differential reflectance spectroscopy. Cyclic voltammetric curves exhibit a distinct reduction peak at ∼ +0.80 V vs. SCE in the negative scan provided the positive limit is extended beyond ∼ +1.2 V vs. SCE. The use of in-situ reflectance spectroscopy allows the identification of RuO4 as the main, if not the only, corrosion product. Based on these results, the voltammetric feature observed at ∼ +0.80 V vs. SCE is attributed to the reduction of RuO4 in solution. Finally, rotating ring—disc and reflectance spectroscopy measurements provide a strong indication that the onset of O2 evolution and Ru corrosion takes place at the same potential and thus the reaction pathways of both processes can be assumed to involve a common intermediate.