Investigation of the properties of Ti/[IrO2-Nb2O5] electrodes for simultaneous oxygen evolution and electrochemical ozone production, EOP |
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Authors: | Má rio H.P. Santana,Julien F.C. Boodts |
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Abstract: | A systematic investigation of the influence of Ti/[IrO2-Nb2O5] electrode composition ([IrO2]=40, 45 and 50 mol%) on electrochemical ozone production (EOP), was conducted in 3.0 mol dm−3 H2SO4 in the presence and absence of 0.03 mol dm−3 KPF6. “In situ” characterisation revealed all oxide layer presented similar structures, except for the 50 mol% IrO2 nominal composition which showed a higher porosity/roughness. The introduction of KPF6 in the electrolyte resulted in an inhibition of the oxygen evolution reaction (OER) at high current densities, improving ozone generation efficiency at i > 0.4 A cm−2, while reducing overpotential for OER. When normalised for the area, the ozone current efficiency presented a good performance of the system. However, improvement of the electrode service life is necessary in order to support the drastic conditions observed during EOP. |
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Keywords: | Ozone Oxygen evolution Iridium oxide Niobium oxide Electrocatalysis |
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