Effects of Precursor Concentration on the Surface Morphology and Electrocatalytic Performance of Ti/IrO2–RuO2–SiO2 Anode for Oxygen Evolution Reaction
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Oxygen evolution reaction (OER) as a counter reaction plays a key role in metal electrowinning. The development of an efficient, long-lived and low-cost anode for OER is of increasingly significance for metal electrowinning. IrO2–RuO2–SiO2 ternary oxide film coated on titanium substrate was prepared using sol-gel route, followed by thermal decomposition method. The effects of precursor concentration on the surface morphology and electrocatalytic properties of Ti/IrO2–RuO2–SiO2 anode were investigated by physical characterization and electrochemical measurements. It was found that the crystallinity of the oxide coating decreased with increasing precursor concentration. Increasing precursor concentration increased the amount of cracks of the oxide coating. The electrocatalytic activity of the prepared anode improved, while the electrocatalytic stability decreased with the increase in precursor concentration. Considering the electrocatalytic activity and stability, precursor concentration of 0.2–0.3 mol L−1 is most suitable for the preparation of the Ti/IrO2–RuO2–SiO2 anode.
KeywordsOxygen evolution reaction Oxide coating Anode Electrocatalytic performance
This work was financially supported by the Innovative Talents Foundation Project of University of Science and Technology Beijing, the National Natural Science Foundation of China (No. U1802253), the National Natural Science Foundation of China (No. 51674026), the Guangxi Innovation-Driven Development Project (No. AA18242042-1) and the Beijing Municipal Natural Science Foundation (No. 2182040).
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