A novel g-C3N4/In2O3/BiVO4 heterojunction photoanode for improved the photoelectrochemical cathodic protection of 304 SS stainless steel under solar light

Recently, photocathodic protection has been regarded as one of the environment-friendly techniques for metal's anti-corrosion. In this technique, n-type semiconductor photoanode produces photogenerated electrons to reparation the lost electrons from metals. Therefore, significant efforts have b...

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Bibliographic Details
Published in:Journal of alloys and compounds 2022-08, Vol.911, p.165047, Article 165047
Main Authors: Helal, Ahmed, Jianqiang, Yu, Eid, Alaa I., El-Hakam, S.A., Samra, S.E., El-Sheikh, S.M.
Format: Article
Language:English
Subjects:
Austenitic stainless steels
Bismuth oxides
BiVO4
Carbon nitride
Cathodic polarization
Cathodic protection
Corrosion prevention
Electrode polarization
Electrons
Heterojunctions
Homogeneous precipitation
Indium oxides
Metals
N-type semiconductors
Open circuit voltage
Photoanodes
Photocatalyst
Photocathodic protection
Stainless steel
Vanadates
Water discharge
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Summary:Recently, photocathodic protection has been regarded as one of the environment-friendly techniques for metal's anti-corrosion. In this technique, n-type semiconductor photoanode produces photogenerated electrons to reparation the lost electrons from metals. Therefore, significant efforts have been made to develop materials with facile methods for improving metals photocathodic protection. Herein, g-C3N4/In2O3/BiVO4 trinary system composite was synthesized through a novel approach. The XRD, UV, and PL techniques were used to confirm the enhancement in photogenerated electrons. Furthermore, the photoelectrochemical results showed that the prepared samples increased the negativity of the 304 SS stainless steel under open circuit potential (OCP) conditions. Additionally, the potential of the 304 SS polarization showed a negative shift from − 505 to − 625 mV and − 635 mV after joined to In2O3/BiVO4 and C3N4/In2O3/BiVO4, respectively. Moreover, the presence of g-C3N4 was provided extra cathodic protection, providing polarization potential more negative during light off. That expects the insertion of this material into the offshore facilities coating to increase its lifetime and decrease corroded metals' discharge into the water bodies. [Display omitted] •A novel C3N4/In2O3/BiVO4 heterojunction composites were synthesized and fully characterized.•It was used to enhance the photoelectrochemical cathodic protection performance of 304 SS.•A wide range of solar light was used instead of visible light for the protection process.•The presence of g-C3N4 was increases the photoactivity and provided an extra cathodic protection.•The life time increased and the discharge of corroded metals into the water bodies was decreased.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2022.165047