HU Jiyue,LIU Qi,LAI Longjie,WANG Lipeng,WANG Rui.Photoelectrochemical Properties of TiO2 Nanotube Array Composite MoS2 Prepared by 2-step Anodization Method[J],53(22):210-219 |
Photoelectrochemical Properties of TiO2 Nanotube Array Composite MoS2 Prepared by 2-step Anodization Method |
Received:December 05, 2023 Revised:April 17, 2024 |
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DOI:10.16490/j.cnki.issn.1001-3660.2024.22.019 |
KeyWord:2-step anodization TiO2 nanotubes MoS2 photoelectrochemical properties |
Author | Institution |
HU Jiyue |
School of Material Science and Engineering, Anhui Polytechnic University, Anhui Wuhu , China |
LIU Qi |
School of Material Science and Engineering, Anhui Polytechnic University, Anhui Wuhu , China |
LAI Longjie |
School of Material Science and Engineering, Anhui Polytechnic University, Anhui Wuhu , China |
WANG Lipeng |
School of Material Science and Engineering, Anhui Polytechnic University, Anhui Wuhu , China |
WANG Rui |
School of Material Science and Engineering, Anhui Polytechnic University, Anhui Wuhu , China |
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Abstract: |
The surface modification of titanium sheet (TA1) can effectively improve its comprehensive performance. The common surface modification technologies of titanium alloy are electroplating, electroless plating, anodic oxidation, micro-arc oxidation, etc. The titanium oxide material prepared by electrochemical anodic oxidation has good photocatalytic activity, high chemical stability, low cost and non-toxicity. Titanium dioxide has a special structure and good performance, and has long been one of the most promising catalyst materials in the field of photocatalysis. Molybdenum disulfide has also received great attention as an excellent photoelectric catalyst. In order to explore the effect of 2-step anodization process on the photoelectrochemical and semiconductor properties of TiO2 nanotubes composited with MoS2, in this experiment, the titanium sheet (TA1) was used as the matrix, and the size of the pattern was cut into 30 mm × 10 mm × 1 mm. The cut sample was pre-treated, and the surface of TA1 was polished with different types of sandpaper in turn so that there was no obvious scratch on the surface. Then it was washed with deionized water, ultrasonically cleaned and dried. The titanium sheet was anodized by a DC pulse stabilized power supply. The voltage was 40 V, and the electrolyte used was ethylene glycol + ammonium chloride aqueous solution. The sample after two-step anodization was placed in a high-pressure reactor containing thiourea and sodium molybdate. MoS2 was grown on TiO2 nanotubes by hydrothermal method at 220 ℃ for 6 hours to obtain a 2-step TiO2/MoS2 heterostructure. The surface morphology of the sample was observed by scanning electron microscopy (SEM). The composite MoS2 nanoparticles were uniformly grown on the tube wall of the nanotube. The crystal structure of the two-step anodization composite MoS2 was analyzed by X-ray diffractometer (XRD). The characteristic peaks of MoS2 were also observed, and no other characteristic peaks appeared. The photogenerated charge recombination of the samples was analyzed by photoluminescence spectrometer (PL). The photoluminescence intensity of 2-step TNTs 50 min/MoS2 was much weaker than that of other samples. EDS was used to analyze the composition changes before and after compounding. The photocurrent density, electrochemical impedance and Mott-Schottky curve of the prepared sample were analyzed by an electrochemical workstation. The performance of the two-step anodized TiO2 nanotube composite MoS2 was greatly improved. The 2-step anodized TiO2 nanotubes have good electrochemical and semiconductor properties at 50 min. On this basis, the composite MoS2 can significantly increase its current density by about 60%, reaching 0.32 mA/cm2. The equivalent circuit fitting shows that the Rct at this time is 298 Ω, and the photoluminescence intensity is obviously weakened. TiO2 nanoarrays can provide abundant growth sites for MoS2, and also provide many carrier transfer channels for improving the photoelectrochemical performance through synergy. The charge transfer resistance of the TiO2 nanotube array composite MoS2 sample prepared by the two-step anodization method is significantly reduced, forming a more convenient electron transport channel, the carrier migration rate becomes faster, and the electron-hole separation efficiency is higher. This study provides a new idea for the preparation and performance improvement of the 2-step anodization composite film. |
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