A stable S-scheme heterojunction for sustainable photoelectrochemical cathodic protection of nickel-phosphorus-coated magnesium alloy

doi:10.1016/j.jmst.2025.02.024

Abstract

Abstract: A novel and long-lasting N₃BD/TiO₂ composite photoanode with stable and superior photoelectrochemical and photoelectrochemical cathodic protection (PECCP) performances was achieved by synthesizing and depositing covalent organic framework (N₃BD) on titanium oxide (TiO₂) nanotube arrays. The composite's increased visible light absorption capability enhanced the galvanic corrosion protection of nickel-phosphorus alloy-coated magnesium alloy (Mg/Ni) through PECCP technology. The open circuit potential (OCP) drops of the Mg/Ni electrode coupling with the N₃BD/TiO₂ composite were 310 and 630 mV at dark state and under illumination, respectively. They remained relatively stable under intermittent visible light irradiation within 72 h, demonstrating excellent long-term stability. The superior photoelectrochemical and PECCP properties of the N₃BD/TiO₂ are attributed to forming S-scheme heterojunctions, which effectively promote the separation and transfer of photogenerated electron-hole pairs and retain a strong redox capacity. This finding provides new insight into the design and synthesis of COF-modified photoanode with highly efficient and stable photoelectrochemical and PECCP performances.

Key words: Magnesium alloy, Corrosion, Electroless nickel plating, Covalent organic framework, Photoelectrochemical cathodic protection

Yu Wen, Yue Liu, Yanghua Teng, Qiwen Yong, Dongmei Pu, Xiaoqiang Fan, Zhi-Hui Xie. A stable S-scheme heterojunction for sustainable photoelectrochemical cathodic protection of nickel-phosphorus-coated magnesium alloy[J]. J. Mater. Sci. Technol., 2025, 233: 179-192.

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