Polyethylene glycol assisted synthesis of a praseodymium-doped PbO2 electrode and its enhanced electrocatalytic oxidation performance

Add time:07/19/2019    Source:sciencedirect.com

A praseodymium (Pr)-doped PbO2 electrode was synthesized by a co-deposition method with the help of polyethylene glycol (PEG). The morphologies and structures were characterized by X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy. The electrochemical properties were investigated by linear sweep voltammetry, electrochemical impedance spectroscopy and accelerated life tests. 4-chlorophenol (4-CP) was used as a model pollutant to evaluate the electrocatalytic activity. The operating parameters for the degradation of 4-CP were optimized. The results indicated that the addition of PEG in the electrodeposition solution significantly promoted the deposition of Pr, resulting in a compact and robust film with vanished boundaries. The impedance of the electrode decreased greatly after the modification of Pr and PEG, which contributed to a good electrocatalytic performance. As compared with those of the undoped electrode, the average current efficiency and the energy consumption of the co-modified electrode increased by 96.8% and decreased by 60.0%, respectively. Additionally, the electrode stability experiments revealed that the lifetime of the co-modified electrode (320 h) was 3.3 times that of the undoped electrode. The improved performance could be attributed to both Pr doping and the addition of PEG in the deposition solution.

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