Photogenerated cathodic protection of stainless steel by liquid-phase-deposited sodium polyacrylate/TiO2 hybrid films

Sodium polyacrylate/TiO2 hybrid films that served as photoanodes for cathodic protection application were prepared by liquid phase deposition. Under white-light illumination, the open-circuit potential of the hybrid films coupled with SUS304 stainless steel could shift to a more negative value and offer an effective photogenerated cathodic protection for stainless steel. Moreover, the hybrid films also exhibited stronger photocurrents in both the ultraviolet-light and visible-light regions compared to that of control TiO2 films. In summary, the addition of sodium polyacrylate could greatly improve the photogenerated cathodic protection properties of the liquid-phase-deposited TiO2 films.

► Sodium polyacrylate/TiO2 hybrid films were prepared by liquid-phase deposition. ► Stronger photoelectrochemical response was observed for the hybrid film. ► The photogenerated cathodic protection for SUS304 stainless steel was observed.