Effects of coating precursor states on performance of titanium-based metal oxide coating anode for Mn electrowinning

Effect of Ultrasound on the Electrochemical Performance and Corrosion Resistance of the Ti/Sn-Ru-CoO x Electrode

A ternary mixed metal oxide coating of Sn-Ru-CoO _x was prepared by ultrasonic treatment. The effect of ultrasound on the electrochemical performance and corrosion resistance of the electrode was investigated in this paper. Results showed that the electrode prepared by ultrasonic pretreatment demonstrated more uniform oxide dispersion on the surface of the coating, smaller grain growth, and more compact surface morphology compared with the anode prepared without ultrasonic pretreatment. At the same time, the best electrocatalytic performance was obtained by the ultrasonically treated coating. The chlorine evolution potential was reduced by 15 mV. The anode prepared by ultrasonic pretreatment had a service life of 160 h, which was 46 h longer than the anode prepared without ultrasonic pretreatment.

Preparation of Porous Ti/RuO2-IrO2@Pt, Ti/RuO2-TiO2@Pt and Ti/Y2O3-RuO2-TiO2@Pt Anodes for Efficient Electrocatalytic Decomposition of Tetracycline

Electrocatalytic oxidation (ECO) has attracted attention because of its high efficiency and environmental friendliness in water treatment. The preparation of anodes with high catalytic activity and long service lifetimes is a core part of electrocatalytic oxidation technology. Here, porous Ti/RuO₂-IrO₂@Pt, Ti/RuO₂-TiO₂@Pt, and Ti/Y₂O₃-RuO₂-TiO₂@Pt anodes were fabricated by means of modified micro-emulsion and vacuum impregnation methods with high porosity titanium plates as substrates. The scanning electron microscopy (SEM) images showed that RuO₂-IrO₂@Pt, RuO₂-TiO₂@Pt, and Y₂O₃-RuO₂-TiO₂@Pt nanoparticles were coated on the inner surface of the as-prepared anodes to form the active layer. Electrochemical analysis revealed that the high porosity substrate could result in a large electrochemically active area, and a long service life (60 h at 2 A cm^-2 current density, 1 mol L^-1 H₂SO₄ as the electrolyte, and 40 °C). The degradation experiments conducted on tetracycline hydrochloride (TC) showed that the porous Ti/Y₂O₃-RuO₂-TiO₂@Pt had the highest degradation efficiency for tetracycline, reaching 100% removal in 10 min with the lowest energy consumption of 167 kWh kg^-1 TOC. The reaction was consistent with the pseudo-primary kinetics results with a k value of 0.5480 mol L^-1 s^-1, which was 16 times higher than that of the commercial Ti/RuO₂-IrO₂ electrode. The fluorospectrophotometry studies verified that the degradation and mineralization of tetracycline were mainly ascribed to the •OH generated in the electrocatalytic oxidation process. This study thus presents a series of alternative anodes for future industrial wastewater treatment.