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TiO 2  is an attractive semiconductor suitable for photocathodic protection, but its weak absorption of visible light and low quantum yield limit its usage. Here, a new heterostructured SnIn 4 S 8  nanosheet/TiO 2  nanotube photoanode was prepared and its photocathodic protection performance was analyzed. SnIn 4 S 8  nanosheets were uniformly deposited on the surface of the TiO 2  nanotube via a solvothermal treatment. The SnIn 4 S 8  / TiO 2  composite exhibited better photocathodic protection performance compared with pure TiO 2  nanotubes, owing to its good visible-light response and photogenerated carrier separation efficiency. Moreover, the composite exhibited a maximum photocurrent density of 100 μA cm −2  for a 6 h solvothermal reaction under visible light irradiation. The negative shift of the photoinduced potential of Q235 carbon steel connected to the composite could reach 0.45 V versus SCE. Therefore, the SnIn 4 S 8 /TiO 2  composite can offer efficient photocathodic protection for Q235 carbon steel against corrosion in 3.5 wt% NaCl solution. This work provides a new approach for the development of high-efficient photoanode materials for the photocathodic protection of metals.

Preparation of SnIn4S8/TiO2 Nanotube Photoanode and Its Photocathodic Protection for Q235 Carbon Steel Under Visible Light