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Titanium dioxide (TiO 2 ) nanotube arrays coupled with a narrow gap semiconductor—bismuth selenide (Bi 2 Se 3 )—exhibited remarkable enhancement in the photocathodic protection property for 304 stainless steel under visible light. Bi 2 Se 3 /TiO 2  nanocomposites were successfully synthesized using a simple two-step method, including an electrochemical anodization method for preparing pure TiO 2  and a chemical bath deposition method for synthesizing Bi 2 Se 3  nanoflowers. The morphology and structure of the composite films were studied by scanning electron microscopy, energy dispersion spectroscopy, X-ray photoelectron spectroscopy and X-ray diffraction. In addition, the influence of the Bi 2 Se 3  content on the photoelectrochemical and photocathodic protection properties of the composite films was also studied. The photocurrent density of the Bi 2 Se 3 /TiO 2  nanocomposites was significantly higher than that of pure TiO 2  under visible light. The sensitizer Bi 2 Se 3  enhanced the efficient separation of the photogenerated electron-hole pairs and the photocathodic protection properties of TiO 2 . Under visible light illumination, Bi 2 Se 3 /TiO 2  nanocomposites synthesized by the chemical bath deposition method with Bi 3+  (0.5 mmol/L) exhibited the optimal photogenerated cathodic protection performance for 304 stainless steel.

Bi2Se3 Sensitized TiO2 Nanotube Films for Photogenerated Cathodic Protection of 304 Stainless Steel Under Visible Light