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Dual functional SnS2/CdS/TiO2 composites for photoelectrochemical cathodic protection and anti-biofouling
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DOI：10.1016/j.cjche.2026.03.024.png)
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Abstract
En 中文
and microbe-caused corrosion of metals and their alloys in marine environments are more critical than ever. So alleviate this corrosion with reduced marine pollution, a combination of photoelectrochemical cathodic protection and anti-biofouling is highly desirable. In this study, SnS2 and CdS nanomaterials were deposited onto the surface of TiO2 through an impregnation deposition method, to potentiate the anticorrosive capability of TiO2. The impregnation time, cycles and concentrations of Cd2+, S2− and Sn4+ were well optimized based on the potential change and current density under intermittent irradiation with simulated sunlight. The obtained SnS2/CdS/TiO2 photoelectrode exhibited photogenerated cathodic protection performance for 304 stainless steel under irradiation with efficient sterilization, realizing anticorrosion via dual pathways. Notably, in 3.5 wt% NaCl solution without a capture agent (e.g., Na2S/Na2SO3), the open circuit potential shifted negatively to about −1080 mV (vs. SCE), and the steady-state photocurrent density (100 μA·cm−2), which was about 7 times that of pure TiO2 (15 μA·cm−2). Antibacterial tests showed efficient inactivation against of Pseudomonas aeruginosa with highest removal efficiency reaching 94.2% after 2 hours of irradiation. All these results suggested a strong application potential of the as-prepared ternary anticorrosive layer in real marine environments.
Keywords:
photoelectrochemical cathodic protection
anti-biofouling
SnS2/CdS/TiO2 composites
marine corrosion
microbial inhibition
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