Abstract
An effective ZnIn2S4 nanosheets/SnO2 quantum dots/TiO2 nanotubes (ZST NTs) composite was successfully synthesized by anodic oxidation, in-situ dipping, and hydrothermal methods. The photocurrent densities of the ZST NTs composites under visible light were as high as 715 μA cm−2, which was 25 times that of pure TiO2 NTs. The ZST NTs showed the largest open circuit potential drop (859.0 mV vs. SCE) when coupled with 316 stainless steel under illumination. These indicated that ZST NTs composites showed highly effective photocathodic protection on 316 stainless steel under visible light. This enhancement was mainly due to that ZnIn2S4 sensitization extended the light absorption into the visible region and heterostructure construction was beneficial for the separation of photogenerated charges. Interestingly, the composites could provide delayed protection of the protected metal for up to 10 h under dark conditions because the SnO2 quantum dots acted as energy storage layer, which was rather important for practical application.
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