Preparation and characterization of Ti/SnO2-Sb2O3/α-PbO2/Ce-Nd-β-PbO2 composite electrode for methyl orange degradation

• Published in: Journal of solid state electrochemistry 2020-03, Vol.24 (3), p.545-555
• Main Authors: Pan, Yufu, Luo, Yanfang, Li, Chengcheng, Wang, Rongjing, Yuan, Yihao, Li, Meng, Na, Ping
• Format: Article
• Language: English
• Subjects: Analytical Chemistry; Antimony trioxide; Cerium; Characterization and Evaluation of Materials; Charge transfer; Chemical oxygen demand; Chemistry; Chemistry and Materials Science; Condensed Matter Physics; Crystal structure; Dyes; Electrochemical impedance spectroscopy; Electrochemical oxidation; Electrochemistry; Electrodes; Energy consumption; Energy Storage; Lead oxides; Morphology; Neodymium; Original Paper; Oxidation; Photoelectrons; Physical Chemistry; Spectrum analysis; Tin dioxide; Wastewater; X ray photoelectron spectroscopy; X-ray spectroscopy
• ISSN: 1432-8488; 1433-0768
• DOI: 10.1007/s10008-019-04468-2

The present study focused on the preparation, characterization, and application of cerium (Ce) and neodymium (Nd) co-doped lead (PbO 2 ) electrode, i.e., Ti/SnO 2 -Sb 2 O 3 /α-PbO 2 /Ce-Nd-β-PbO 2 . The electrochemical activities of the modified electrode were investigated and compared with those of Ce-PbO 2 , Nd-PbO 2 , and pure PbO 2 electrodes. Scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) were used to characterize the surface morphology, crystal structure, and elemental states of the modified electrode. The Ce and Nd co-doped PbO 2 electrode had smaller crystal particles, more compact structure, and higher activity of electrocatalysis compared with the single-doped and undoped PbO 2 electrodes. Linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS) were also utilized to study the electrochemical response of the modified electrodes. The results show that the prepared Ce-Nd-PbO 2 electrode has the highest O 2 evolution potential (OEP) and lowest charge transfer resistance, suggesting that it has the lower energy consumption than the other three kinds of electrodes. Electrochemical oxidation methyl orange (MO) as a model dye wastewater was studied to evaluate the potential applications of this modified electrode in environmental science. It was found that the Ce-Nd-PbO 2 electrode exhibited higher MO and chemical oxygen demand (COD) removal efficiency than single-doped and pure PbO 2 electrodes.