Citation:
YANG Wei-Hua, YANG Wu-Tao, LIN Xiao-Yan. Preparation and Characterization of a Novel Bi-Doped PbO2 Electrode[J]. Acta Physico-Chimica Sinica,
;2012, 28(04): 831-836.
doi:
10.3866/PKU.WHXB201202101
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A novel high-performance PbO2 electrode modified with Bi3+ (Bi-PbO2) was prepared by electrodeposition. The microstructure and electrochemical properties of the modified electrode were investigated using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS), fluorospectrophotometry (FP), Mott-Schottky analysis, electrochemical impedance spectroscopy (EIS), and linear-sweep voltammetry (LSV). The results of SEM, EDS, XPS, XRD, and UV-Vis DRS show that insertion of Bi3+ , which is in the form of Bi2O3, into the PbO2 film can reduce its particle size, change its crystal cell parameters, and narrow its bandgap (Eg). FP analysis reveals that the electrocatalytic activity of the Bi-PbO2 electrode in the degradation of organic materials is higher than that of the PbO2 electrode because more hydroxyl radicals can be generated on its surface. Electrochemical performance tests show that the modified electrode has a more negative flat-band potential (Efb), larger active surface area, lower charge-transfer resistance, and higher oxygen-evolution potential; these characteristics promote the electrocatalytic activity of the Bi-PbO2 electrode in the decomposition of organic materials.
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Keywords:
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Bismuth
, - Lead dioxide,
- Bandgap,
- Flatband potential,
- Electro-catalytic activity
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