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

R. Kötz, S. Stucki, Daniel Alberto Scherson, D. M. Kolb

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Abstract

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.

Original languageEnglish
Pages (from-to)211-219
Number of pages9
JournalJournal of Electroanalytical Chemistry
Volume172
Issue number1-2
DOIs
Publication statusPublished - 1984 Aug 24
Externally publishedYes

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ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Analytical Chemistry
  • Electrochemistry

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