Preparation of Lotus Root-like TiO2 Nanotube Arrays in NH4F-(NH4)2SO4 Composite Electrolyte and Its Photogenerated Cathodic Protection Performance

doi:10.11902/1005.4537.2023.119

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (2): 389-395 DOI: 10.11902/1005.4537.2023.119

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Preparation of Lotus Root-like TiO₂ Nanotube Arrays in NH₄F-(NH₄)₂SO₄ Composite Electrolyte and Its Photogenerated Cathodic Protection Performance

WANG Tongtong, ZHANG Juanrui, GAO Yun, GAO Rongjie(

)

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

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WANG Tongtong, ZHANG Juanrui, GAO Yun, GAO Rongjie. Preparation of Lotus Root-like TiO₂ Nanotube Arrays in NH₄F-(NH₄)₂SO₄ Composite Electrolyte and Its Photogenerated Cathodic Protection Performance. Journal of Chinese Society for Corrosion and protection, 2024, 44(2): 389-395.

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Abstract

At present, TiO₂, as a low-cost and non-polluting N-type semiconductor material, has been applied to photogenerated cathodic protection technology due to its excellent photoelectric conversion performance. In comparison with the ordinary nanotube arrays, the highly ordered lotus root-like TiO₂ nanotube arrays (TNTAs) present much larger specific surface area and more effective photoreaction sites, which is conductive to enhancing the photoelectrochemical properties of TiO₂ nanotube arrays. In this paper, lotus root-like TiO₂ nanotube arrays were prepared by a two-step anodization process in NH₄F-(NH₄)₂SO₄composite electrolyte. The effect of different anodization voltages on the performance of TiO₂ nanotube photoanodes was studied. The structure, morphology and separation rate of photogenerated carriers of TNTAs prepared by different appllied anodic oxidation voltages were studied by XRD, SEM and photoluminescence spectra (PL). At the same time, under the irradiation of a simulated sunlight, the photoelectrochemical performance was evaluated by the photocurrent density measurement, and the cathodic protection effect of the photoanode on 304 stainless steel was evaluated by measurements of open circuit potential and Tafel polarization potential, as well as by fitting EIS curves. The results show that when the anodic oxidation voltage is 25 V, TNTAs have clear lotus root-like shape, high regularity, high photogenerated carrier separation rate and high photogenerated current density. Accordingly, the prepared TNTAs present lower open circuit potential, while better cathodic protection effect for 304 stainless steel substrates.

Key words: TiO₂ nanotubes anodic oxidation photoelectrochemistry photocathode protection

Received: 18 April 2023 32134.14.1005.4537.2023.119

ZTFLH:

TG172

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

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

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.119 OR https://www.jcscp.org/EN/Y2024/V44/I2/389

Fig.1 Schematic diagrams of photogenerated cathodic protection performance test devices: (a) single battery system, (b) dual battery system

Fig.2 XRD patterns of XV-TNTAs

Fig.3 XPS survey spectrum (a) and fine spectra of Ti 2p (b) and O 1s (c) for XV-TNTAs

Fig.4 Transversal (a-d) and vertical section (e-h) section images of 15V-TNTAs (a, e), 20V-TNTAs (b, f), 25V-TNTAs (c, g) and 30V-TNTAs (d, h)

Fig.5 Photoluminescence spectra of XV-TNTAs

Fig.6 Photocurrent-time curves of XV-TNTAs under intermittent visible light

Fig.7 Open circuit potential-time curves of XV-TNTAs

Fig.8 Tafel polarization curves of XV-TNTAs coupled with 304 stainless steel

Fig.9 Nyquist plots of XV-TNTAs (a) and electrochem-ical impedance equivalent circuit model(b)

Table 1 Fitting parameters of electrochemical impedance spectroscopies of XV-TNTAs

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