New g-C3N4/GO/MoS2 composites as efficient photocatalyst for photocathodic protection of 304 stainless steel
Photocathodic protection is an economical and environmental metal anticorrosion method. In this research, we successfully synthesized the g-C3N4/GO (15 wt%)/MoS2 catalytic materials by a facile hydrothermal method. The results show that the as-prepared g-C3N4/GO (15 wt%)/MoS2 composites prominently...
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| Autores principales: | , , , , , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
IWA Publishing
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/7888337ae7124f95983bd975da4ded3a |
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| Sumario: | Photocathodic protection is an economical and environmental metal anticorrosion method. In this research, we successfully synthesized the g-C3N4/GO (15 wt%)/MoS2 catalytic materials by a facile hydrothermal method. The results show that the as-prepared g-C3N4/GO (15 wt%)/MoS2 composites prominently enhanced photocatalytic activities for the photocathodic protection of 304 stainless steel (SS) compared with the corresponding pristine g-C3N4 and MoS2. Notably, the AC impedance results demonstrated that the Rct value of 304 SS coupled with g-C3N4/GO (15 wt%)/MoS2 decreased to 35.66 Ω•cm2, which is 29 and 37 times lower than that of g-C3N4 and MoS2 alone. In addition, g-C3N4/GO (15 wt%)/MoS2 provided the highest current density (77.19 μA•cm2) for the 304 SS, which is four times that of pristine g-C3N4. All results indicate that as-prepared g-C3N4/GO (15 wt%)/MoS2 photocatalysts have produced a distinct enhancement on photocathodic protection performance. An optimum decorating amount of MoS2 onto g-C3N4 forms heterojunctions of g-C3N4/MoS2, which favor the separation of electrons and holes efficiently. Furthermore, the addition of GO further promotes the separation and transfer of photo-induced carriers. HIGHLIGHTS
g-C3N4/GO/MoS2 photocatalytic activity was enhanced to protect 304 stainless steel.;
The absorption boundary of g-C3N4/GO/MoS2 was red-shifted toward the visible area.;
The photo-induced carriers’ recombination of g-C3N4/GO/MoS2 was inhibited.;
The 304 stainless steel was effectively protected when coupled to a photo-anode.; |
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