1. CuInS2/TiO2 heterojunction with elevated photo-electrochemical performance for cathodic protection.
- Author
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Liu, Juan, Wang, Ning, Zheng, Fuwei, Wang, Chuanxing, Wang, Jing, Hou, Baorong, Zhao, Qianyu, Ning, Yanli, and Hu, Yiteng
- Subjects
CATHODIC protection ,QUANTUM dots ,SEMICONDUCTOR quantum dots ,P-N heterojunctions ,HETEROJUNCTIONS ,TITANIUM dioxide ,ELECTRIC fields - Abstract
• CuInS 2 /TiO 2 photoanode was prepared for photoelectrochemical cathodic protection for the first time. • The modified Ti surface was pretreated in L -cysteine solution to facilitate the in-situ growth of CuInS 2 quantum dots. • CuInS 2 /TiO 2 photoanode exhibited efficient photo-induced cathodic protection. Semiconductor quantum dots with high quantum yield and photovoltaic conversion efficiency have ushered in a brilliant moment for constructing internal electric field heterojunctions for photogenerated cathodic protection applications. In this paper, TiO 2 nanotubes grown vertically on the surface of titanium substrates were modified via a combination of conventional electrochemical oxidation and a one-step solvothermal pathway to sensitize with CuInS 2 quantum dots. Compared with pure TiO 2 photoelectrodes, the modification improves sunlight absorption efficiency and provides photoelectron cathodic protection to the 304 stainless steel (304 SS). Through 9 h solvothermal reaction, the CuInS 2 /TiO 2 coupled with protected 304 SS exhibited an excellent property when the simulated sunlight irradiation. Its mixed open circuit potential is negatively shifted to -0.99 V, at the mean time with a stable photocurrent density (118 μA cm
−2 ). The results indicate that CuInS 2 and TiO 2 established a p-n heterojunction with well-matched energy level, which can effectively facilitate the carrier separation and retain the strong redox capbility of photo-induced electrons and holes. [ABSTRACT FROM AUTHOR]- Published
- 2022
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