CaIn2S4 nanosheets and SnO2 nanoflowers co-sensitized TiO2 nanotubes photoanode for continuous and efficient photocathodic protection of Q235 carbon steel
Source abstract
Abstract
To solve the problem of poor photocathodic protection (PCP) effect of pure TiO 2 nanotubes (NTs) on Q235 carbon steel (CS), CaIn 2S 4 nanosheets (NSs) and SnO 2 nanoflowers (NFs) co-sensitized TiO 2 NTs were prepared by anodization, hydrothermal and solvothermal method. Results showed that the absorption edge of CaIn 2S 4/SnO 2/TiO 2 NTs extended to 540 nm, indicating the utilization efficiency of visible light was greatly improved. Under light, the CaIn 2S 4/SnO 2/TiO 2 NTs exhibited an open circuit potential drop of 530 mV vs. SCE and a photocurrent density of 624 μA cm −2, which was 23 and 48 times that of TiO 2 NTs, respectively. The PCP properties of CaIn 2S 4/SnO 2/TiO 2 NTs were better than that of TiO 2 NTs because the separation and transfer efficiency of electrons and holes were promoted due to the heterojunction structure formed between TiO 2, SnO 2 and CaIn 2S 4. Furthermore, the CaIn 2S 4/SnO 2/TiO 2 NTs could also provide time-delay protection up to 10 h in the dark state. Obviously, CaIn 2S 4/SnO 2/TiO 2 NTs have excellent electron storage capacity and could provide efficient and continuous protection, which may be due to the presence of SnO 2 NFs. This work provides an effective strategy of designing more efficient photoanodes for PCP of metals.
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Research context
OpenAlex topics: Advanced Photocatalysis Techniques · TiO2 Photocatalysis and Solar Cells · Gas Sensing Nanomaterials and Sensors
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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