IrO2-ZrO2-SiO2 ternary oxide composites- based DSAs: Activity toward oxygen evolution reaction with long-term stability

• Published in: Journal of the Taiwan Institute of Chemical Engineers 2024-08, Vol.161, p.105548, Article 105548
• Main Authors: Hosseini, Mir Majid, Hosseini, Mir Ghasem, Ahadzadeh, Iraj, Najjar, Reza
• Format: Article
• Language: English
• Subjects: Advanced electrocatalyst; Dimensionally stable anode (DSA); Long-term stability; OER; Ternary oxides (IrO2-ZrO2-SiO2) coating
• ISSN: 1876-1070; 1876-1089
• DOI: 10.1016/j.jtice.2024.105548

•Ternary metallic oxide (IrO2-ZrO2-SiO2) composites as a good catalyst for OER.•The DSA of IZS (20–30–50) with a more porous surface area.•The DSA of IZS (20–30–50) showed a highly accelerated lifetime for OER.•The electrocatalytic properties of the DSA electrodes are attributed to both surface area (geometric) effect and their intrinsic catalytic nature (kinetic effect).•Co-incorporation of the SiO2 and ZrO2 in the DSA composition increase the geometric active surface area. Higher purity of copper is produced by Electrowinning (EW) in the cathode. A major challenge in this technique is the anodic structure that causes in the energy consumption, corrosion resistance, and contamination of the copper produced in the cathode. Ternary metallic oxide (IrO2-ZrO2-SiO2) composites with the different molar percentages of IrO2: SiO2 (10:60, 15:55, and 20:50%) were prepared on titanium substrate by the sol-gel technique, and then thermal decomposition to study the impact of IrO2 and SiO2 contents on the electrocatalyst performances of the dimensionally stable anodes (DSAs). The physicochemical properties of the DSAs were determined by X-ray diffraction (XRD), Field emission scanning electron microscope (FE-SEM), Atomic force microscopy (AFM), and electrochemical measurements. FE-SEM and AFM images display the impact of SiO2 on the crystallization and crystal growth of IrO2, leading to the formation of finer oxide particles and the porous morphology of the ternary oxide coatings. The DSA composed of 50 % SiO2 and 20 % IrO2 (IZS (20–30–50)) with a more porous surface area represented high apparent electrocatalytic activity toward the oxygen evolution reaction with long-term stability as analyzed under cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and accelerated lifetime (ALT) plots. [Display omitted]