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An ordered TiO 2 nanotube array (NTA) film was first fabricated on a Ti substrate by anodization, β-Bi 2 O 3 nanoparticles were then electrodeposited on the film for obtaining a heterostructured β-Bi 2 O 3 -TiO 2 NTA composite film with enhanced photocathodic protection performances. Compared to the bare TiO 2 NTA film, the composite film showed a wider light absorption region and higher charge carrier separation efficiency. Under white light illumination, the composite film as a photoanode made the potential of 403 stainless steel in a 0.5 M NaCl solution decrease by 450 mV relative to its corrosion potential, showing an effective photoelectrochemical cathodic protection effect. [ABSTRACT FROM AUTHOR]

[Display omitted] • A Ag/SnO 2 co-modified TiO 2 nanotube composite photoanode was prepared. • Light absorption of the composite photoanode was extended to the visible region. • The photoanode showed enhanced photocathodic protection for 403 stainless steel. • The composite photoanode had charge storage ability under white light illumination. A TiO 2 nanotube film was fabricated on a Ti foil via anodization, SnO 2 quantum dots were deposited on the film by hydrothermal treatment, and then Ag nanoparticles were formed on the SnO 2 /TiO 2 film by pulse electrodeposition to obtain a Ag/SnO 2 co-modified TiO 2 composite photoanode with good photocathodic protection performance and charge storage ability. The properties of the composite film were investigated by surface analyses, UV–vis and fluorescence spectroscopies, and photoelectrochemical measurements. The results showed that the light absorption of the Ag/SnO 2 /TiO 2 film was extended into the visible region compared with the TiO 2 film. The photocurrent intensity of the composite film was two times as high as that of the TiO 2 film. The composite photoanode under illumination by white light made the potential of the coupled 403 stainless steel (403SS) in a 0.5 M NaCl solution drop by 475 mV in contrast with its corrosion potential, showing an enhanced photocathodic protection effect. It is noteworthy that the 403SS potential was still 270 mV lower than the corrosion potential within 22.5 h after cutting off the illumination, demonstrating that the cathodic protection could be maintained through the charge storage ability of the composite photoanode. [ABSTRACT FROM AUTHOR]

[Display omitted] • A novel CdSe/ZnIn 2 S 4 /TiO 2 heterostructured nanotube composite film was fabricated. • Light absorption of the nanocomposite film was extended to the visible region. • Photoelectric conversion performance of the nanocomposite was greatly improved. • The nanocomposite showed effective photocathodic protection for stainless steel. In order to obtain a TiO 2 nanocomposite film with enhanced photoelectrochemical properties for corrosion protection of metals, a TiO 2 nanotube film was fabricated on a Ti substrate via anodization, then ZnIn 2 S 4 nanosheets and CdSe nanoparticles were sequentially deposited on the TiO 2 film by hydrothermal treatment and electrodeposition, respectively. The CdSe/ZnIn 2 S 4 co-modified TiO 2 heterostructured nanocomposite film showed remarkably enhanced visible light absorption and photoelectrochemical properties. Under white light irradiation, the photocurrent density of the nanocomposite film in the mixed solution with 0.1 M Na 2 S and 0.1 M Na 2 SO 3 was 33 times higher than that of the TiO 2 film. The nanocomposite could negatively shift the potential of the coupled 403 stainless steel immersed in a 0.5 M NaCl solution by 440 mV, showing efficient photoelectrochemical cathodic protection. [ABSTRACT FROM AUTHOR]

• A heterostructured Bi 2 S 3 /rGO/TiO 2 nanotube composite film photoanode was fabricated. • The composite film showed a much narrower band gap than the simple TiO 2 film. • Light absorption of the composite film was extended to the visible region. • The photoanode showed excellent photocathodic protection for stainless steel. A novel Bi 2 S 3 /reduced graphene oxide (rGO) co-modified TiO 2 nanotube photoanode was fabricated on a Ti foil by anodization combined with cyclic voltammetric electrodeposition, and successive ionic layer adsorption and reaction. After modifying the TiO 2 nanotube film with rGO sheets and Bi 2 S 3 nanoparticles, the band gap of the Bi 2 S 3 /rGO/TiO 2 composite film decreased, and its photoresponse was extended to the visible region. Under white light irradiation, the composite film in a 0.1 M Na 2 SO 3 and 0.1 M Na 2 S solution exhibited 62.5 times higher photocurrent density than the TiO 2 film. The composite film photoanode could make the potential of the coupled 403 stainless steel in a 0.5 M NaCl solution negatively shift by 490 mV, showing enhanced photoelectrochemical cathodic protection. [ABSTRACT FROM AUTHOR]

Highlights • A platelike ZnS-Bi 2 S 3 /TiO 2 /WO 3 composite film was synthesized on an FTO substrate. • The composite film showed enhanced photoelectric effect for photocathodic protection. • The composite film had charge storage ability to maintain photocathodic protection. Abstract A novel platelike ZnS-Bi 2 S 3 /TiO 2 /WO 3 composite film was constructed on a fluorine-doped tin oxide substrate through hydrothermal treatment combined with thermal hydrolysis and successive ion layer absorption and reaction. The composite film showed enhanced photoelectrochemical performances compared with a pure WO 3 film. The ZnS-Bi 2 S 3 /TiO 2 /WO 3 film under white light illumination could negatively shift the potential of the coupled 403 stainless steel in a 0.5 M NaCl solution by 540 mV relative to its corrosion potential, showing effective photocathodic protection. After the light was stopped, the composite film continuously provided the cathodic protection for 18 h owing to its charge storage ability. [ABSTRACT FROM AUTHOR]

[Display omitted] • A novel g-C 3 N 4 /SrTiO 3 co-decorated rutile TiO 2 nanorod composite film was fabricated. • g-C 3 N 4 /SrTiO 3 /TiO 2 composite film had an appropriate cascade energy band structure. • The composite film exhibited a highly enhanced visible light absorption capability. • Electron-hole separation and transfer mechanism of the composite film was explained. • The composite film showed excellent photocathodic protection for stainless steel. A highly efficient g-C 3 N 4 /SrTiO 3 co-decorated rutile TiO 2 nanorod composite film photoanode was fabricated on a conductive glass substrate by a three-step synthesis process involving hydrothermal reactions and chemical vapor deposition. The g-C 3 N 4 /SrTiO 3 /TiO 2 composite film with an appropriate cascade energy band structure showed greatly improved visible light absorption and exhibited 4.5 times higher photocurrent density than the undecorated TiO 2 film, resulting from its higher separation and transfer efficiency of the photogenerated electron-hole pairs. Under the white light irradiation, the composite film photoanode made the potential of the coupled 403 stainless steel in a 0.5 M NaCl solution decrease by 680 mV from its free corrosion potential, showing a significantly enhanced photoelectrochemical cathodic protection effect. [ABSTRACT FROM AUTHOR]

A combined hydrothermal reaction and sequential chemical bath deposition method is developed for fabricating a Bi 2 S 3 modified single crystalline rutile TiO 2 nanorod array film on transparent conductive glass. The results indicate that the modification of Bi 2 S 3 nanoparticles extends the photoresponse of the Bi 2 S 3 /TiO 2 composite film into the visible light region, and enhances its photoactivity. The Bi 2 S 3 /TiO 2 film can serve as a photoanode in a photoelectrochemical cell and provide more effective photogenerated cathodic protection for 403 stainless steel in a corrosion cell with a 0.5 M NaCl solution under white or visible light illumination compared with the pure TiO 2 film. [ABSTRACT FROM AUTHOR]