Preparation and Photoelectrocatalytic Performance of Ti/PbO₂ Electrodes Modified with Ti₄O₇

Abstract

The Ti 4 O 7 modified Ti/PbO 2 electrodes have been prepared by electrodeposition, and investigated systemically using scanning electron microscope (SEM), Energy dispersive X-ray spectroscopy (EDS), powder X-ray diffraction (XRD), photoluminescence spectroscopy (PL), and degradation of anthraquinone dye (reactive brilliant blue KNÀR: C 22 H 16 N 2 Na 2 O 11 S 3 ). It is found that the Ti 4 O 7 modified Ti/PbO 2 electrodes possessed smaller PbO 2 crystal grains, good porous structure, enhanced oxygen evolution over-potential and higher electrical conductivity, as compared to that of Ti/PbO 2 electrode. Additionally, the Ti 4 O 7 modified Ti/PbO 2 electrode exhibited also longer accelerated lifetime, and higher photoelectrocatalytic activity for degradation of anthraquinone dye (reactive brilliant blue KNÀR) than that of Ti/PbO 2 electrode. The enhancement of the decolorization efficiency and stability for Ti 4 O 7 modified Ti/PbO 2 electrodes can be ascribed to the large electrochemical active areas, the presence of photoelectric synergism, rapid separation of photogenerated carriers, inhibition of oxygen precipitation, high current efficiency for formation of hydroxyl radicals, and the weakening of internal stress in PbO 2 coatings.

Fabrication of graphene oxide wrapped Ti/Co3O4 nanowire photoanode and its superior photoelectrocatalytic performance

“…In recent years, the removal of recalcitrant organic pollutants in wastewater by electrochemical oxidation has attracted much attention, because with regard to the biological treatment, most of recalcitrant organic matter can be completely degraded or alleviated to an acceptable level [5]. Various anode materials have been extensively employed for electrochemical oxidation of recalcitrant pollutants in an aqueous environment, including SnO 2 , PbO 2 , Ru(Ir)O 2 , Co 3 O 4 , Pt, and boron-doped diamond [6][7][8][9][10][11][12][13]. Among the various types of anode materials, Co 3 O 4 has been found to be a promising candidate with excellent activity and robust durability in electrochemical processes [10,[14][15][16][17].…”