Effect of SnO₂‐Sb₂O₅ Interlayer on Electrochemical Performances of a Ti‐Substrate Lead Dioxide Electrode

Abstract

The Ti/SnO 2 -Sb 2 O 5 /PbO 2 electrode was prepared by electrodeposition method onto Ti substrate with SnO 2 -Sb 2 O 5 interlayer. Microstructure information of SnO 2 -Sb 2 O 5 interlayer and PbO 2 coating was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Our study shows that the titanium substrate is completely covered by the SnO 2 -Sb 2 O 5 solid solution interlayer and the interlayer combines the Ti substrate closely with the PbO 2 coating. The electrochemical performance of the Ti/SnO 2 -Sb 2 O 5 /PbO 2 electrode was studied by cyclic voltammogram (CV), electrochemical impedance spectroscopy (EIS) and accelerated life test. The results show the electrochemical activity, electrical conductivity and stability of Ti-substrate lead dioxide electrode are increased. The deactivation process of the Ti/SnO 2 -Sb 2 O 5 /PbO 2 electrode was also studied by the EIS. The SnO 2 -Sb 2 O 5 interlayer can effectively prevent the growth of a TiO 2 insulating layer between the substrate and the PbO 2 coating during the lifetime tests, thus maintain high activity of Ti/SnO 2 -Sb 2 O 5 /PbO 2 electrode for 10 times longer than Ti/PbO 2 electrode without interlayer.

Synthesis, characterization of Cu, N co-doped TiO2 microspheres with enhanced photocatalytic activities

“…In the present study, the Cu is in +2 oxidation state and Ti is in +4 oxidation state. The radius of Ti 4+ (0.68 Å) is similar to that of Cu 2+ (0.73 Å), hence copper ions may be incorporated into the lattice of TiO 2 and occupied some of the titanium lattices [25,26]. The charge compensation is mainly achieved by the ionized vacancies especially doubly ionized oxygen vacancies.…”

Fabrication and Characterization of a PbO2-TiN Composite Electrode by Co-Deposition Method

“…16 Besides, the catalytic performance of the Ti/PbO 2 electrode still has room for improvement. Thus, several efforts have been devoted to further improve its performance in the electrochemical oxidation capability and stability, including inserting the middle layer, 17 . Based on the reports above mentioned, it can be concluded that an appropriate modification can effectively improve the performances of the electrode.…”

“…16 Besides, the catalytic performance of the Ti/PbO 2 electrode still has room for improvement. Thus, several efforts have been devoted to further improve its performance in the electrochemical oxidation capability and stability, including inserting the middle layer, 17 doping with elements (Bi, 18 Co, 19 Fe, 20 F, 21 Ce, 22 Cu, 23 etc. ), compounds (TiO 2 , 24 fluorine resin (FR), 25 etc.)…”

Preparation and characterization of PbO2 electrodes from electro-deposition solutions with different copper concentration

“…The voltammetric charge quantity (q*), which is related to real surface area and the number of active sites, can reect the electrochemical activity of an electrode. 35 For the same electrode material, larger q* indicates higher electrode activity. We employed the method reported in literature 34 to calculated q* for estimating the electrode activity.…”