Jiajia Cai,Yongjun Li,Zhengxin Cai,Xiangxuan Tang,Zhi Zhang,Jianmin Wang,Qian Xie,Pengyan Zhang,Song Li
Photocathodic protection (PCP) can convert solar energy into protecting marine metallic structures from corrosion. However, the serious photocarrier recombination in the photoanode has hindered the development of the PCP technique. This study reported a feasible approach to construct the heterojunction with a tunable built-in electric field by epitaxially growing CdIn 2 S 4 (CIS) on the surface of WO 3 . The light absorbance, carrier separation, and transportation were found to be strongly dependent on the built-in field, and it would enable not only protection of the 304SS but also retard the corrosion of more vulnerable Q235. Accordingly, the OCP of coupled photoelectrode shifted to -950 and -880 mV Ag/AgCl for 304SS and Q235, and their photocurrent density also reached 100 and 170 μA/cm 2 , respectively. Notably, the PCP performance of anti-corrosion on the 304SS and Q235 was visualized by microscopy, further proving the effectiveness of the photoanode. The underlying mechanisms and different protection capabilities were discussed in detail.
Graphical Photo-electrochemical cathodic protection technology is considered to be a green metallic corrosion protection technology that uses solar energy to protect against corrosion without consuming any anode materials. A CdIn 2 S 4 /WO 3 nanosheet composite film with electron self-storage properties was synthesized and used as a photoelectrode to couple with metallic materials to provide photo-electrochemical cathodic protection under light illumination and continuing cathodic protection in the dark. This research will promote the practical application of photo-electrochemical cathodic protection technology. Photo-electrochemical cathodic protection (CP) technology is considered to be a green metallic corrosion protection technology that uses solar energy to protect from corrosion and does not consume any anode materials. In this work, a CdIn 2 S 4 /WO 3 nanocomposite photoelectrode was prepared, and its photo-electrochemical CP performance and mechanism were studied and analyzed. WO 3 has a well band matching with CdIn 2 S 4 , leading to a significantly enhanced photo-electrochemical CP performance of the nanocomposite. Meanwhile, as confirmed in this work, the CdIn 2 S 4 /WO 3 nanocomposite can store photoinduced electrons under light illumination through intercalation reactions and changing the valence state of tungsten. Moreover, it can discharge in the dark state to provide continuous CP for the coupled metals. This research will promote the practical application process of the photo-electrochemical CP technology.
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