Oxygen evolution and hypochlorite production on Ru-Pt binary oxides

C. C. Hu, C. H. Lee, Ten-Chin Wen

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The electrocatalytic activities of Ru-Pt binary oxide electrodes prepared by thermal decomposition for both oxygen and chlorine evolution reactions (OER and CER) were investigated by cyclic voltammetry (CV) and log i/E relationships (Tafel study). Both CV and Tafel studies revealed that the electrodes from the coating solutions with 60 and 20 mol % Pt content possessed the maximum apparent activity for OER and optimal apparent activity for CER/hypochlorite production, respectively. The specific activity (i/q*) revealed that mixing of the RuO2 and PtOx had no synergistic effects for OER due to the occurrence of phase segregation, which was revealed by element mapping/surface morphologies and Auger electron spectroscopy. Lower current efficiencies for hypochlorite production were found on the freshly prepared binary electrodes (type I electrodes) than on those having been treated by repetitive CVs (type II electrodes). Stability testing of both type I and II electrodes was measured in 0.5 M NaCl solution at 300 mA cm-2 for 480 h, indicating that both type I and II electrodes are quite stable under the above conditions.

Original languageEnglish
Pages (from-to)72-82
Number of pages11
JournalJournal of Applied Electrochemistry
Issue number1
Publication statusPublished - 1996 Jan 1

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Electrochemistry
  • Materials Chemistry


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