Effect of the addition of NH4F on anodic behaviors of DSA-type electrodes in H2SO4-(NH4)2SO4 solutions |
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| Authors: | Ken-ichi Fukuda Chiaki Iwakura Hideo Tamura |
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| Affiliation: | Department of Applied Chemistry, Faculty of Engineering, Osaka University, Suita, Osaka, Japan |
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| Abstract: | The effect of NH4F addition on the high-anodic behaviors of various DSA-type electrodes was investigated in a mixture of sulfuric acid and ammonium sulfate. The pronounced effect of NH4 addition was observed on DSA-type Ti/RuO2, Ti/IrO2?TiO2 electrodes, but not observed on the other electrodes studied. The close relationship was found between the increment of the electrode potential caused by the NH4 addition and the quantity of F? adsorbed on the electrode surface. The effect of NH4F addition was considered to be resulted from the adsorption of F? on the electrode surface, and the presence of adsorbed F? was directly proved. |
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