Co3O4 nanowires (NWs) are a promising photoelectrocatalytic (PEC) material; however, they still needto be improved to increase the transport rate and separation efficiency of induced hole/electron pairs,thereby enhancing PEC performance. In this work, we demonstrate that the photodeposition of Ag intoTi/Co3O4 NW coatings can promote its PEC ability toward degrading high concentrations of dyeingwastewater. The PEC evaluation shows that the decolorization rate of anthraquinone dye (reactivebrilliant blue KN-R) over Ag-modified Ti/Co3O4 NWs is 91.7%, which is higher than that of Ti/Co3O4NWs (68.3%). This improvement in PEC activity can be ascribed to Ag-modified Ti/Co3O4 NWs havingfast carrier transport, a low resistance, a high oxygen evolution overpotential, a large active area andgood electron migration efficiency. Moreover, photoelectric synergy can be observed for Ag-modifiedTi/Co3O4 NWs in the PEC process. The present study provides an effective strategy for thephotoelectrochemical treatment of dyeing wastewater by using Ag-modified Ti/Co3O4 NWs as an anode.
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