TiO2/vanadium pentoxide (V2O5) and TiO2–V2O5 coatings were prepared on type 304 stainless steel substrates via a sol–gel method, respectively. The TiO2/V2O5 coating is compared with the TiO2–V2O5 coating in terms of the photo‐electrochemical performance. The two coatings can be stored with photogenerated electrons under UV irradiation in 3 wt% aqueous NaCl. The self‐discharging time of the TiO2/V2O5 coating is slower than that of the TiO2–V2O5 coating. The slow discharging may be suitable for an anti‐corrosion application for stainless steel. In the case while the two coatings are electrochemically charged under UV irradiation for 1 h, the TiO2/V2O5 coating can maintain a good cathodic protection for type 304 stainless steel for 6 h in the dark, while the TiO2–V2O5 coating can only maintain a good cathode protection for 0.5 h in the dark.
In the present work, graphene-WO 3 nanowire clusters were synthesized via a facile hydrothermal method. The obtained graphene-WO 3 nanowire clusters were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Xray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, and ultravioletvisible diffuse reflectance spectroscopy (DRS) techniques. The photocatalytic oxygen (O 2 ) evolution properties of the as-synthesized samples were investigated by measuring the amount of evolved O 2 from water splitting. The graphene-WO 3 nanowire clusters exhibited enhanced performance compared to pure WO 3 nanowire clusters for O 2 evolution. The amount of evolved O 2 from water splitting after 8 h for the graphene-WO 3 nanowire clusters is ca. 0.345 mmol/L, which is more than 1.9 times as much as that of the pure WO 3 nanowire clusters (ca. 0.175 mmol/L). The high photocatalytic activity of the graphene-WO 3 nanowire clusters was attributed to a high charge transfer rate in the presence of graphene.
A combined electroless plating and sol-gel method was developed for preparing a NiP/TiO 2 bilayer coating to achieve an especial photocathodic protection effect for A3 low carbon steel. Photocathodic protection properties of the coating were investigated by the electrochemical method. Surface morphology and structure of the coating were characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD). The results show that the open circuit potential (OCP) of the NiP/TiO 2 coating electrode shifts to À0.42 V under UV irradiation, which is lower than the corrosion potential of A3 low carbon steel. When the light is turned off, the photocathodic protection effect cannot be maintained. In addition, the mechanism of photocathodic protection for the coating was also explored.
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