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Journal of Chinese Society for Corrosion and protection  2020, Vol. 40 Issue (2): 123-130    DOI: 10.11902/1005.4537.2019.217
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Effect of Preparation and Surface Modification of TiO2 on Its Photoelectrochemical Cathodic Protection Performance
XIE Xuan1,2, LIU Li1(), WANG Fuhui1
1 Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China
2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
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Abstract  

Co(OH)2 was deposited firstly on the surface of nanotube TiO2 by successive ionic layer adsorption and reaction method, and then deposited Co(OH)2 was transformed partially into CoOx by post heat treatment, therewith the Co(OH)2/CoOx modified TiO2 nanotube was acquired as high performance photoanode material. By assessing the effect of the times of Co(OH)2 deposition, as well as the temperature and holding time of heat treatment on the performance of the Co(OH)2/CoOx modified TiO2 nanotube, the optimal processing parameters were determined for the preparation of the best photoanode material. Besides, the relevant mechanism was proposed to interpret the role of Co(OH)2/CoO surface modification in the enhancement of photoelectric performance of the TiO2 nanotube.
Key words:  TiO2      Co(OH)2/CoOx modification      process control      photoelectric property      cathodic      protection     
Received:  13 June 2019     
ZTFLH:  TG172  
Fund: National Natural Science Foundation of China(51622106);National Natural Science Foundation of China(51871049)
Corresponding Authors:  LIU Li     E-mail:  liuli@mail.neu.edu.cn
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Xuan XIE
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XIE Xuan, LIU Li, WANG Fuhui. Effect of Preparation and Surface Modification of TiO2 on Its Photoelectrochemical Cathodic Protection Performance. Journal of Chinese Society for Corrosion and protection, 2020, 40(2): 123-130.

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https://www.jcscp.org/EN/10.11902/1005.4537.2019.217     OR     https://www.jcscp.org/EN/Y2020/V40/I2/123

Fig.1  Flow chart of process parameter selection for heat treatment process of preparation of TiO2 nanotubes (a) and Co(OH)2 and CoOx surface modification (b)
Fig.2  SEM image of microstructures of TiO2 nanotubes
Fig.3  Open circuit potential of TiO2 with different heat treatment temperatures: (a) without modification, (b) Co(OH)2 modified, (c) the relationship between E under illumination and heat treatment temperature of TiO2 preparation
Fig.4  Effect of different heat treatment temperatures on protective current density of TiO2 without modification (a), with Co(OH)2 modification (b), and the relationship between current density under illumination and heat treatment temperature of TiO2 preparation (c)
Fig.5  Influence of Co(OH)2 modification times on protec-tive potential of TiO2
Fig.6  Influence of Co(OH)2 modification times on protective potential (E) (a), protective current density of CoOx modified TiO2 (b) and the relationship between E under illumination and Co(OH)2 modification times (c)
Fig.7  Influence of heat treatment fixation temperature on protective potential (E) of CoOx modified TiO2 (a) and the relationship between E under illumination and heat treatment fixation temperature (b)
Fig.8  Influence of heat treatment fixation preservation time on protective potential (E) of CoOx modified TiO2 (a) and the relationship between E under illumination and heat treatment fixation preservation time (b)
Fig.9  Proposed mechanism for the enhanced photoelectrochemical cathodic protection performance of Co(OH)2/CoOx modified TiO2 films on 304 stainless steel under illumination
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