目的 通过引入稀土元素Er对中间层SnO2-Sb2O3进行改性，提高基体与活性层的结合力。在RuO2作活性层的基础上添加导电PPy（聚吡咯），增强电极的电催化氧化性能。方法 以Ti为基体，分别采用涂覆-热分解法和电沉积法制备SnO2-Sb2O3-Er中间层和RuO2-PPy活性层，应用X-射线衍射（XRD）考察掺杂不同比例的Er和C4H5N对晶相结构的影响，采用扫描电镜（SEM）、能量散射光谱（EDS）和红外光谱（FT-IR）分析中间层和活性层的形貌、元素组成和物相结构，通过线性极化法（LSV）、电化学阻抗（EIS）和加速寿命测试对电极的析氧过电位和稳定性进行分析，最后利用复合电极组成的电解工艺对页岩气返排废水进行处理，考察其降解有机物的能力。结果 在n(Sn4+):n(Er3+)=100:4时，形成的涂层晶粒尺寸最小，且相对未掺杂Er的中间层，掺杂后的表面裂纹减少，说明其可进一步阻止电极的钝化。PPy可对活性层进行有效改性，其加入后可使复合RuO2电极的析氧电位由1.6 V增至1.8 V，膜电极电阻由56.2 Ω降低到7.6 Ω，电极寿命由267天延长至391天，返排废水的COD去除率可达93.7%。结论 Er的掺杂和PPy的加入可提高电极的电催化活性，且对废水中的有机物降解效果显著。

The works aims to introduce rare-earth element Er to modify the intermediate layer SnO2-Sb2O3 and improve the binding force between the substrate and the active layer. PPy (polypyrrole) is added to the active layer of RuO2 to enhance the electrocatalytic oxidation performance of the electrode. SnO2-Sb2O3-Er as intermediate layer and RuO2-PPy active layer were prepared by coating thermal decomposition and electrodeposition with Ti as the matrix. The effects of Er and C4H5N concentration on the crystal phase structure were investigated by X-ray diffraction (XRD) and the scanning electron microscope (SEM), energy spectrum analysis (EDS) and infrared light (FT-IR) were used to analyze the morphology, element composition and phase structure of the intermediate and active layers. The oxygen potential and stability of the electrodes were tested by linear polarization (LSV) and electrochemical impedance testing (EIS) and accelerated life test. The electrolytic technology of composite electrodes was used to treat the waste water from shale gas and the ability to degrade organic matter was investigated. When n(Sn4+):n(Er3+) = 100:4, the grain size of the coating was the smallest, and the surface crack of intermediate layer doped with Er decreased relative to the intermediate layer undoped with Er. Thus, the passivation of the electrode could be prevented further. The PPy could effectively modify the active layer. After PPy was added, the oxygen evolution potential of the composite RuO2 electrode could be increased from 1.6 V to 1.8 V, the electrode resistance was reduced from 56.2 Ω to 7.6 Ω, the life of the electrode was extended from 267 days to 391 days and the COD removal rate of reflow wastewater could reach 93.7%. The addition of Er and PPy can improve the electrocatalytic activity of the electrode, and the degradation effect of organic matter in the wastewater is remarkable.