Enhanced photoelectrochemical cathodic protection performance of MoS2/TiO2 nanocomposites for 304 stainless steel under visible light

doi:10.1016/j.jmst.2020.01.029

Abstract

Abstract:

In this work, TiO₂ nanotube arrays (NTAs) sensitized with MoS₂ microspheres (MoS₂/TiO₂ nanocomposites) were prepared on a flat Ti substrate via two-step anodization and hydrothermal method sequentially. TiO₂ NTAs were composed of many orderly nanotubes, whose large specific surface area was favorable for light absorption and MoS₂ microsphere adhesion. The MoS₂ microsphere as a narrow band gap semiconductor extended the TiO₂ NTAs’ absorption band edge to the visible region. The 2D structure of MoS₂ microspheres and the construction of heterojunction electronic field at the interface of MoS₂ microspheres and TiO₂ NTAs promoted the separation of photoinduced carriers. The MoS₂/TiO₂ nanocomposites could provide higher photoelectrochemical cathodic protection for 304 stainless steel (304 SS) under visible light than pristine TiO₂ NTAs.

Key words: Anti-corrosion, TiO₂ nanotube array, MoS₂ microspheres, Photoelectrochemical cathodic protection, Visible light

Xiumin Ma, Zheng Ma, Dongzhu Lu, Quantong Jiang, Leilei Li, Tong Liao, Baorong Hou. Enhanced photoelectrochemical cathodic protection performance of MoS₂/TiO₂ nanocomposites for 304 stainless steel under visible light[J]. J. Mater. Sci. Technol., 2021, 64: 21-28.

Figures/Tables 12

Fig. 1. XRD patterns of pure TiO2 NTAs and MoS2/TiO2 nanocomposites.

Fig. 2. SEM images of TiO2 TNAs and MoS2/TiO2 nanocomposites: (a) top-view of pure TiO2 NTAs, (b) cross-sectional view of pure TiO2 NTAs, (c, d) top-view of MoS2/TiO2 nanocomposites, (e) cross-sectional view of MoS2/TiO2 nanocomposites, (f) EDS of MoS2/TiO2 nanocomposites.

Fig. 3. TEM (a) and HRTEM (b) images of MoS2/TiO2 nanocomposites.

Fig. 4. XPS spectra of MoS2/TiO2 nanocomposites: (a) survey spectrum, (b) Ti 2p, (c) Mo 3d, (d) S 2p, (e) O 1s.

Fig. 5. UV-vis DRS of TiO2 NTAs, MoS2 microspheres and MoS2/TiO2-15.

Fig. 6. Photoinduced i-V curves of TiO2 NTAs and MoS2/TiO2 nanocomposites.

Fig. 7. EIS spectra plots of pristine TiO2 NTAs, MoS2 microspheres and MoS2/TiO2-15.

Table 1 Fitting parameters of EIS results by equivalent circuit for different photoelectrodes in dark.

Electrodes	R_sol (ohm cm²)	R_ct (ohm cm²)	R_pore,s (ohm cm²)	R_p (ohm cm²)	W (S s⁵/cm²)
TiO₂	19.07	5.696E15	3.827E4	1.661E4	3.639E-14
MoS₂	31.74	E15	558.6	5.772	1.002E-20
MoS₂/TiO₂	0.02	E12	47.92	3.6E2	143

Fig. 8. OCP of 304 SS coupled with TiO2 NTAs, MoS2/TiO2 nanocomposites: (a) under intermittent illumination by visible light, (b) long-term photoelectrochemical cathodic protection.

Fig. 9. The I-t curves of TiO2 NTAs, MoS2/TiO2 nanocomposites.

Fig. 10. Tafel curves of 304 SS and 304 SS coupled with TiO2 NTAs, MoS2/TiO2-15.

Fig. 11. A schematic illustration for the fabrication of MoS2/TiO2 nanocomposites for photoelectrochemical cathodic protection of 304 SS.

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Enhanced photoelectrochemical cathodic protection performance of MoS₂/TiO₂ nanocomposites for 304 stainless steel under visible light

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