Photoelectrochemical Properties of MoS2 Modified TiO2 Nanotube Arrays

doi:10.15541/jim20160107

Abstract

Abstract:

Well aligned TiO₂ nanotube arrays were grown by anodization method on Ti foils in ethylene glycol electrolyte. Flowers-like molybdenum disulfide composed with nanoflakes was synthesized by hydrothermal process on TiO₂ nanotube arrays, using sodium molybdate, thiourea and L-Cysteine as reactants. The obtained samples were analyzed by X-ray diffraction (XRD) and scanning electron microscope (SEM) equipped with energy dispersive X-ray detector. Linear sweeps voltammetry, electrochemical impedance spectroscopy and Mott-Schottky plots of samples were analyzed by electrochemical workstation. The results showed that a flowers-like MoS₂ with diameter of c.a. 200 nm was synthesized, forming a heterojunction between TiO₂ nanotube arrays and MoS₂, which can effectively promote the separation of photogenerated charges, reduce the electron-hole recombination. Optimum concentration of sodium molybdate was obtained at 0.8 mmol/L, its corresponding photoconversion efficiency reached 1.65%, which was 2.89 times as high as that of pure TiO₂, and the charge transfer resistance decreased approximately 50%. The MoS₂/TiO₂ composite exhibited high carrier density of 3.38×10²³ cm^-3, which was about 24 times higher than that of pure TiO₂ nanotube arrays.

Key words: anodization, TiO2 nanotube arrays, molybdenum disulfide, hydrothermal method

CLC Number:

TQ174

YU Lian-Qing, HUANG Cheng-Xing, ZHANG Ya-Ping, DONG Kai-Tuo, HAO Lan-Zhong. Photoelectrochemical Properties of MoS₂ Modified TiO₂ Nanotube Arrays[J]. Journal of Inorganic Materials, 2016, 31(11): 1237-1241.

Figures/Tables 6

Fig. 1 XRD patterns of MoS2/TiO2

Fig. 2 Raman spectra of samples 0.8-MT, 1.5-MT

Fig. 3 SEM images of (a) pure TiO2, (b) sample 0.8-MT, and (c) sample 1.5-MT, (d) EDS analysis of sample 0.8-MT

Fig. 4 (a) Linear sweep voltammograms and (b) photoconversion efficiency curves of MoS2/TiO2

Fig. 5 (a) Nyquist plots (Insert: equivalent circuit fitting the EIS) and (b) Mott-Schottky plots of MoS2/TiO2

Table 1 Physics parameters of MoS2/TiO2

Sample	R_ct /(Ω·cm^-2)	V_fb/V (vs Ag/AgCl)	N_D /cm^-3
0.4-MT	507.6	-0.448	1.40×10²³
0.8-MT	407.4	-0.395	3.38×10²³
1.5-MT	375.6	-0.533	4.02×10²²
3-MT	322.5	-0.508	7.66×10²²
Pure TiO₂	594.8	-0.612	1.35×10²²

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Photoelectrochemical Properties of MoS₂ Modified TiO₂ Nanotube Arrays

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