Electrochemical chlorine evolution reaction (CER) is an important electrochemical reaction for industrial application, but it has serious problems such as the short service life and low electrolytic efficiency in the extremely dilute chlorine-containing solution. In this paper, RuO2-TiO2/IrO2-Ta2O5 (RuTi/IrTa) electrode was prepared by the thermal decomposition method of alternately coating precursor solutions of two active components, which significantly improve the service lifetime and CER selectivity of electrode materials with the low Ir content. The experimental results indicate that the accelerated lifetime (AL) of RuTi/HC-IrTa electrode with the Ir loading of 374 μg cm-2 can reach 602 h. Although the Ir loading of HC-IrTa electrode (680 μg cm-2) is about twice that of RuTi/HC-IrTa electrode, the AL of HC-IrTa electrode is only 245 h. And the AL of RuTi electrode (Ru loading: 180 μg cm-2) is only 5 h. If the precursor solutions of HC-IrTa and RuTi electrodes are simply mixed, the AL of RuTi-HC-IrTa electrode obtained is only 41 h. This suggests that the increase of AL really comes from the change of coating method, rather than simply using multiple active components. In addition, SEM results indicate that the increase of AL in RuTi/HC-IrTa is the change of the corrosion mechanism from the pitting corrosion to the surface corrosion of active components. Moreover, the CER selectivity of RuTi/IrTa electrode has also been improved. This may be due to the change of the electronic structure, which is proved by the XPS characterization. RuTi/IrTa electrode has the high electrolysis efficiency in the electrolysis of low chlorine concentration solution. In the preparation of the electrochemical disinfection technology (EDT), such as acidic electrolyzed water (AEW), more available chlorine content (ACC) can be obtained..

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