Cite this paper:
TIAN Jing, CHEN Zhuoyuan, JING Jiangping, FENG Chang, SUN Mengmeng, LI Weibing. Photoelectrochemical cathodic protection of Cu2O/TiO2 p-n heterojunction under visible light[J]. Journal of Oceanology and Limnology, 2020, 38(5): 1517-1531

Photoelectrochemical cathodic protection of Cu2O/TiO2 p-n heterojunction under visible light
TIAN Jing1,3,4, CHEN Zhuoyuan1,3, JING Jiangping1, FENG Chang1,4, SUN Mengmeng1, LI Weibing2
1 Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;
2 School of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao 266042, China;
3 Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China;
4 University of Chinese Academy of Sciences, Beijing 100049, China
Abstract:
The Cu2O/TiO2 p-n heterojunction composite photoelectrodes were prepared by depositing Cu2O nanoparticles on the surface of TiO2 nanotubes via anodic oxidation and constant current deposition. Field emission scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM) analyses showed that Cu2O nanoparticles not only deposited on the surface of TiO2 nanotube array, but also on the wall of TiO2 nanotubes. The Cu2O deposition amount could be adjusted by changing the deposition time. The photoelectrochemical cathodic protection (PECCP) performance of the prepared photoelectrodes for 316L stainless steel (SS) was tested under visible light. The constant current deposition time had a significant effect on the PECCP performance of Cu2O/TiO2-X photoelectrodes and Cu2O/TiO2-20 had the best PECCP performance for the coupled 316L SS. This was attributed to the appropriate amount and thickness of Cu2O to form p-n heterojunctions with TiO2, in which separation of the photogenerated carriers was accelerated and transfer of the photogenerated electrons to 316L SS for PECCP was facilitated.
Key words:    Cu2O/TiO2|p-n heterojunction|316L SS|photoelectrochemical cathodic protection   
Received: 2019-12-19   Revised: 2020-01-30
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Articles by TIAN Jing
Articles by CHEN Zhuoyuan
Articles by JING Jiangping
Articles by FENG Chang
Articles by SUN Mengmeng
Articles by LI Weibing
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