Preparation of TiO2 Nanotube Arrays in Composite Electrolytes and Their Photogenerated Cathodic Protection Performance

doi:10.11902/1005.4537.2021.255

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (5): 759-764 DOI: 10.11902/1005.4537.2021.255

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Preparation of TiO₂ Nanotube Arrays in Composite Electrolytes and Their Photogenerated Cathodic Protection Performance

BAO Chenyu, LI Jianmin, YE Mengying, GAO Rongjie(

)

School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China

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Abstract

At present, TiO₂ nanotubes are mainly prepared in single fluorinated electrolyte by secondary anodization. Herewith TiO₂ nanotube arrays were prepared in three electrolytes of different fluoride ions (F^-, BF₄^-, F^--BF₄^-) by secondary anodization, aiming to figure out how the preparation processes affect the photogenerated cathodic performance of the prepared TiO₂ nanotubes as photoanodes. The morphology, structure, light response ability and photogenerated carrier separation efficiency of the three nanotubes were comparatively examined by means of SEM, XRD, UV-vis DRS and PL, while the photoelectrochemical properties of the three samples were tested in the condition of open and closed visible light. The results showed that TiO₂ nanotube arrays prepared in glycol composite electrolyte containing NH₄F, NH₄BF₄ and H₂O presented much regular structure, stronger light absorption, higher photogenerated carrier separation efficiency and better photogenerated cathodic protection for 304 stainless steels rather than those prepared in traditional electrolyte of single fluoride salt.

Key words: secondary anodization TiO₂ nanotube composite electrolyte photocathode protection

Received: 22 September 2021

ZTFLH:

TG172

Fund: National Natural Science Foundation of China-Shandong Province Joint Fund(U1706221)

Corresponding Authors: GAO Rongjie E-mail: dmh206@ouc.edu.cn

About author: GAO Rongjie, E-mail: dmh206@ouc.edu.cn

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Cite this article:

BAO Chenyu, LI Jianmin, YE Mengying, GAO Rongjie. Preparation of TiO₂ Nanotube Arrays in Composite Electrolytes and Their Photogenerated Cathodic Protection Performance. Journal of Chinese Society for Corrosion and protection, 2022, 42(5): 759-764.

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https://www.jcscp.org/EN/10.11902/1005.4537.2021.255 OR https://www.jcscp.org/EN/Y2022/V42/I5/759

Fig.1 Surface images (a, c, e) and cross section images (b, d, f) of FTNT (a, b), BFTNT (c, d) and F-BFTNT (e, f)

Fig.2 XRD patterns of FTNT, BFTNT and F-BFTNT

Fig.3 UV-vis diffuse reflectance spectra of FTNT, BFTNT and F-BFTNT

Fig.4 Fluorescence spectra of FTNT, BFTNT and F-BFTNT

Fig.5 Photocurrent density-time curves of FTNT, BFTNT and F-BFTNT in intermittent light

Fig.6 Variations of OCP of FTNT, BFTNT and F-BFTNT coupled with 304SS in intermittent light

Fig.7 Nyquist plots of FTNT, BFTNT and F-BFTNT in simulated sunlight and equivalent circuit diagram

Table 1 Fitting parameters of electrochemical impedance spectra of FTNT, BFTNT and F-BFTNT in simulated sunlight

Fig.8 Proposed mechanism of the photoinduced cathodic protection process^[34]

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