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Preparation and characterization of PbO2 electrodes modified with polyvinyl alcohol (PVA)

机译：用聚乙烯醇（PVA）改性PBO2电极的制备与表征

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摘要

Novel PbO _(2) electrodes were successfully synthesized with polyvinyl alcohol (PVA) modification through electro-deposition technology. The morphology and crystalline structure of the electrodes were characterized by SEM and XRD, respectively. In addition, X-ray photoelectron spectroscopy (XPS), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and accelerated life stability testing were also carried out to analyze the chemical state, electrochemical performances and stability of the electrodes. The results showed that PVA could refine the grain size and increase the oxygen evolution potential (OEP). After PVA modification, the predominant phase of the PbO _(2) electrodes was unchanged and all were pure β-PbO _(2) . Besides, for modified electrodes, the electrode film impedance reduced and the proportion of adsorbed hydroxyl oxygen (O _(ad) ) on the electrode increased, implying the fast charge transfer and excellent degradation efficiency for organics. In the process of dye oxidation, the PbO _(2) -2.0 vt% electrode showed the highest electrocatalytic activity for ARG degradation due to its highest OEP and massive O _(ad) . Moreover, the accelerated service life tests revealed that the PbO _(2) -2.0 vt% electrode exhibited the highest stability and the accelerated service life was 329.5 h, which was more than 3 times longer than that of the PbO _(2) -0 vt% electrode (96 h).
机译：通过电沉积技术成功地合成了新型PBO _（2）电极用聚乙烯醇（PVA）改性。通过SEM和XRD分别表征电极的形态和晶体结构。另外，还进行了X射线光电子体光谱（XPS），循环伏安法（CV），电化学阻抗光谱（EIS）和加速寿命稳定性测试，以分析化学状态，电化学性能和电极的稳定性。结果表明，PVA可以细化晶粒尺寸并增加氧气进化电位（OEP）。在PVA改性之后，PBO _（2）电极的主要阶段不变，所有均是纯β-PbO _（2）。此外，对于改进的电极，电极膜阻抗减少，并且电极上吸附的羟基氧（O _（Ad））的比例增加，暗示了有机物的快速电荷转移和优异的降解效率。在染料氧化过程中，PBO _（2）-2.0Vt％电极显示出由于其最高OEP和大规模O _（AD）而导致的睾丸降解的最高电催化活性。此外，加速的使用寿命测试显示PBO _（2）-2.0Vt％电极表现出最高稳定性，加速的使用寿命为329.5小时，比PbO _（2）的时间长3倍以上3倍以上 - 0 Vt％电极（96小时）。

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