采用电沉积法制备不同浓度聚乙二醇(PEG)改性PbO2电极, 通过SEM、XRD等对电极表面形貌和晶相结构进行表征, 利用苯酚降解实验考察电极的电催化氧化特性, 并进一步通过电化学阻抗谱(EIS)和线性极化扫描(VA)实验考察其电化学性质. SEM和XRD结果表明, PEG可以使电极表面颗粒明显趋于细化, 提高β-PbO2的结晶纯度. 电化学实验表明改性电极具有更好的电催化活性, 更低的界面转移电阻和更高的析氧电位, PEG最佳掺杂 浓度为6g/L. 苯酚五次连续降解和加速寿命测试实验表明, 优化电极具有良好的电催化稳定性, 更长的使用寿命和更好的耐腐蚀性.
PbO2 electrodes modified with different concentrations of polyethylene glycol (PEG) were prepared by electrodeposition. SEM and XRD were employed to investigate the surface morphology and crystal structure of PbO2 electrodes, and its electrocatalytic acitivity was analyzed through degradation experiments of phenol. Furthermore, electrochemical impedance spectroscope (EIS) and liner sweep voltammetry (VA) were carried out to get a better understanding of its electrochemical properties. SEM images and XRD patterns show that PEG can decrease the partical size of PbO2 and improve the crystal purity of β-PbO2. The modified electrodes exhibite better electrocatalytic activity, lower charge transfer resistance and higher oxygen evolution potential compared with unmodified electrodes in the electrochemical experiments. Additionally, five times degradation experiments of phenol and accelerated lifetime tests reveal that the optimal electrode modified with 6g/L PEG has excellent electrocatalytic stability, longer lifetime and better corrosion resistance.
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