Comparison of electrocatalytic characterization of Ti/Sb-SnO2 and Ti/F-PbO2 electrodes

Abstract

Electrocatalytic oxidation is a promising process for degrading toxic and biorefractory organic pollutants in wastewater treatment. Selection of electrode materials is crucial for electrochemical oxidation process. In this study, Ti/F-PbO 2 and Ti/Sb-SnO 2 electrodes were chosen to compare their electrocatalytic characterization, which were prepared by electrodeposition and thermal decomposition method, respectively. The surface morphology and crystal structure of two electrodes were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The linear polarization curves show that Ti/Sb-SnO 2 electrodes possess higher oxygen evolution overpotential than Ti/F-PbO 2 electrodes. But the stability and corrosion resistance ability of Ti/F-PbO 2 electrode was higher than that of Ti/Sb-SnO 2 electrode. The electrocatalytic activity of Ti/F-PbO 2 and Ti/Sb-SnO 2 electrodes was examined for the electrochemical oxidation of malachite green (MG). The bulk electrolysis shows that the Ti/SbSnO 2 electrodes exhibit the higher electrocatalytic activity for the degradation of MG than Ti/F-PbO 2 electrodes, and the degradation process is good fitting for the pseudo-first order reaction. The higher electrocatalytic activity of Ti/ Sb-SnO 2 electrodes can be attributed to the higher oxygen evolution overpotential.

Magnetic Assembled Anode Combining PbO2 and Sb-SnO2 Organically as An Effective and Sustainable Electrocatalyst for Wastewater Treatment with Adjustable Attribution and Construction

“…Although both of them are associated with nonactive anodes, ,, it is not hard to rank two anodes by comparing their capability in removing TOC, COD, and intermediates, which depends on the specific electrode preparation process and the target pollutant. PbO 2 was reported to have a better performance from some studies, , while in the others’ research ,,− and our previous work, , Ti/Sb-SnO 2 was found to present a stronger oxidation power, especially in further degrading intermediates. Therefore, combined GC–MS analysis in this study, we deduced that Sb-SnO 2 -based AE coatings offered not only more catalytic sites in increasing the space–time yield but also a stronger oxidation power as the complement of the power of PbO 2 ME in further degrading the intermediates, therefore causing less accumulation of monomers and the diversity of other intermediates.…”

CdS Quantum Dots Sensitized 2D La2Ti2O7 Nanosheets as Support for Visible Light‐Assisted Electrocatalytic Methanol Oxidation in Alkaline Medium

“…This negative impedance behavior is due to the oxidation removal of CO from the catalyst surface and the recovery of the catalytic active sites. [33,36,37] In the potential range of À0.10-0 V ( Figure 9C,F www.advancedsciencenews.com www.entechnol.de transfer on the Pt-CdS QDs/LTO electrode in the methanol oxidation process under the photo-assistance.…”

“…The electron transfer kinetics of methanol oxidation on the Pt-CdS QDs/LTO electrode with and without visible light irradiation were studied using EIS at various potentials in the range of 0-0.4 V. As shown in Figure 9A, from À0.4 to À0.25 V, the diameters of the impedance arcs (DIAs) decrease rapidly with an increase in potential under light irradiation, suggesting that more and more active sites are available for methanol oxidation due to the oxidation removal of CO intermediate species, which are generated from methanol dehydrogenation at lower potentials. [33,36,37] When the potential continues to increase ( Figure 9B), the DIA begins to increase due to the poisoning and oxidation of catalyst at higher potentials. However, the arc suddenly reversed to the second quadrant at À0.15 V of the Pt-CdS QDs/LTO electrode under light irradiation.…”

Electrochemical degradation of ciprofloxacin with a Sb-doped SnO2 electrode: performance, influencing factors and degradation pathways

“…The distance between the two electrodes was 3 cm. Effects of coating times (8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20), current density (10-25 mA cm À2 ), electrolyte concentration (10-40 g L À1 ), initial concentration (10-80 mg L À1 ), and pH value (3-9) on degradation were investigated. During experiments, samples were taken every 15 min, and UV-vis Spectrophotometer (TU-1901, Beijing, China) was mainly used to monitor the removal rate of CIP in terms of variances in the absorbance, and the main absorption peak (l max ) located at 275 nm.…”

“…17 The anode materials are vital for electrochemical oxidation because they determine the formation of hydroxyl radicals. 18 The electrode materials, including SnO 2 , 19 PbO 2 , 20 and boron doped diamond, 21 had been widely used in wastewater treatment. Among them, the Sb-doped SnO 2 electrode has a wonderful application prospect due to its excellent electrochemical activity, chemical stability, and electrical conductivity.…”