Ti/Zr-SnO2/β-PbO2 electrode was successfully fabricated by the first thermal decomposition method for preparing Zr-SnO2 interlayer and the second electrodeposition of β-PbO2 layer.The electrode morphology,crystal structure and elemen-tal composition were analyzed using scanning electron microscopy(SEM),energy-dispersive X-ray spectroscopy(EDS),X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS)techniques.The electrochemical properties were inves-tigated by cyclic voltammetry(CV),electrochemical impedance spectroscopy(EIS),accelerated lifetime tests.The electrocata-lytic degradation of methylene blue(MB)and the optimization of current density and initial MB concentration were carried out.The results showed that Ti/Zr-SnO2/β-PbO2 electrode has a compact pyramidal structure,and non-stoichiometric β-PbO2 was formed.In comparison with the conventional Ti/β-PbO2 electrode,the impregnation of Zr-SnO2 interlayer can effectively improve the oxygen evolution overpotentials of the titanium-based coated electrode,which exhibited low resistance of 87.64 Ω/cm2 and accelerated lifetime of 439 min,which is 219.5 times higher than that of Ti/β-PbO2 electrode and 1.71 times higher than that of Ti/Zr-SnO2/β-PbO2 electrode.The removal rate could reach 97％toward 50.00 mg/L of MB within 180 min at a current density of 50 mA/cm2.
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