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Oxygen evolution and hypochlorite production on Ru-Pt binary oxides

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Abstract

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 PtO x 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.

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Authors and Affiliations

  1. Department of Chemical Engineering, National Cheng Kung University, 70101, Tainan, Taiwan, Republic of China

    C. -C. Hu, C. -H. Lee & T. -C. Wen

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  1. C. -C. Hu
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  2. C. -H. Lee
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  3. T. -C. Wen
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Hu, C.C., Lee, C.H. & Wen, T.C. Oxygen evolution and hypochlorite production on Ru-Pt binary oxides. J Appl Electrochem 26, 72–82 (1996). https://doi.org/10.1007/BF00248191

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  • DOI: https://doi.org/10.1007/BF00248191

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