Enhancement of photoelectric and photocatalytic activities: Mo doped TiO2 thin films deposited by sputtering

Luo, Shuai; Yan, Bingxi; Shen, Jie

doi:10.1016/j.tsf.2012.07.121

Cited by 37 publications

(21 citation statements)

References 17 publications

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“…A high symmetric peak of Ti 2p means a complete oxidation of Ti (Luo et al, 2014). Figure 3C shows the highresolution Mo 3d core-level XPS spectra, the binding energies of 232.9 eV and 235.99 eV can be ascribed to the feature of Mo 6+ , while 232.09 eV and 235.1 eV consistent with the existence of Mo 5+ in the Mo-TiO 2 @NC composites (Luo et al, 2012). These results therefore show that the Mo was doped into the lattice of TiO 2 nanoparticle and represented in the state of Mo 6+ and Mo 5+ in the Mo-TiO 2 @NC samples, thereby when Mo 6+ and Mo 5+ replaced the Ti 4+ , the titanium vacancies formed in the TiO 2 lattice.…”

Section: Resultsmentioning

confidence: 70%

Encapsulating Mo-Doped TiO2 Anatase in N-Doped Amorphous Carbon With Excellent Lithium Storage Performances

et al. 2019

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To improve the capability, cycling stability and rate capacity of anatase TiO 2-based electrode, Mo-doped TiO 2 anatase encapsulated in nitrogen-doped amorphous carbon (denoted for Mo-TiO 2 @NC) were synthesized using a facile hydrothermal method followed by a coating with polyaniline (PANI) and heating treatment. When tested as an anode for lithium ion batteries, the Mo-TiO 2 @NC electrode showed an initial discharge and charge capacity of 850.7 and 548.3 mAh g −1 at a current density of 85 mA g −1 , respectively, with a remarkable discharge capacity maintained at 449.2 mAh g −1 after 100 cycles. Even at a high current density of 850 mA g −1 , a reversible capacity of 154 mAh g −1 after 200 cycles was obtained, displaying good rate capacity and long-term cycling stability. The outstanding electrochemical performance of Mo-TiO 2 @NC can be attributed to the synergistic effect of aliovalent ions doping and carbon coating.

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Section: Resultsmentioning

confidence: 70%

Encapsulating Mo-Doped TiO2 Anatase in N-Doped Amorphous Carbon With Excellent Lithium Storage Performances

et al. 2019

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“…On the other hand, the redox potentials of the doping species involved should not be left aside. In this case, the potentials of the Mo 6+ /Mo 5+ and W 6+ /W 5+ pairs are +0.4 V and −0.03 V, respectively [41,42], and they are more positive than the potential of the TiO 2 conduction band (−0.51 V) [43], so their electronic capture is favored when both are present in titania. The prepared catalysts showed no 4CP removal due to adsorption, and likewise, the photolysis effect was negligible.…”

Section: Photocatalytic Testsmentioning

confidence: 93%

Enhanced Photocatalytic Activity of Titania by Co-Doping with Mo and W

et al. 2018

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Various W and Mo co-doped titanium dioxide (TiO2) materials were obtained through the EISA (Evaporation-Induced Self-Assembly) method and then tested as photocatalysts in the degradation of 4-chlorophenol. The synthesized materials were characterized by thermogravimetric analysis (TGA), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), Raman spectroscopy (RS), N2 physisorption, UV-vis diffuse reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). The results showed that the W-Mo-TiO2 catalysts have a high surface area of about 191 m2/g, and the presence of an anatase crystalline phase. The co-doped materials exhibited smaller crystallite sizes than those with one dopant, since the crystallinity is inhibited by the presence of both species. In addition, tungsten and molybdenum dopants are distributed and are incorporated into the anatase structure of TiO2, due to changes in red parameters and lattice expansion. Under our experimental conditions, the co-doped TiO2 catalyst presented 46% more 4-chlorophenol degradation than Degussa P25. The incorporation of two dopant cations in titania improved its photocatalytic performance, which was attributed to a cooperative effect by decreasing the recombination of photogenerated charges, high radiation absorption capacity, high surface areas, and low crystallinity. When TiO2 is co-doped with the same amount of both cations (1 wt.%), the highest degradation and mineralization (97% and 74%, respectively) is achieved. Quinones were the main intermediates in the 4-chlorophenol oxidation by W-Mo-TiO2 and 1,2,4-benzenetriol was incompletely degraded.

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“…Li et al [15] reported a novel Ni-doped TiO 2 inverse opal photonic microarray (IOPM) structure photocatalyst and Ni doping could increase the visible light absorption. Recent studies indicate that the radius of Mo 6+ is similar to that of Ti 4+ , thus, compared with other transition metal elements, Mo can effectively replace Ti 4+ in TiO 2 crystal lattice [18,19]. The doping donates a contribution to redshift as the absorption edge moving towards the region of visible light and improve the light response under both ultraviolet and visible light as well, enhancing the photoelectrochemical activity of TiO 2 [7,18].…”

Section: Introductionmentioning

confidence: 99%

“…Recent studies indicate that the radius of Mo 6+ is similar to that of Ti 4+ , thus, compared with other transition metal elements, Mo can effectively replace Ti 4+ in TiO 2 crystal lattice [18,19]. The doping donates a contribution to redshift as the absorption edge moving towards the region of visible light and improve the light response under both ultraviolet and visible light as well, enhancing the photoelectrochemical activity of TiO 2 [7,18]. Wang et al [20] prepared Mo-doped TiO 2 nanoparticles through the sol-gel method, where the band gap of TiO 2 can be reduced from 3.19 to 3.05 eV with an increase in doping concentration, and the photocatalytic ability of TiO 2 nanoparticles reached the best level at 2.0 at.% Mo doping.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Photoelectrochemical Properties from Mo-Doped TiO2 Nanotube Arrays Film

Xue

Luo

et al. 2020

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Mo-doped TiO2 nanotube arrays are prepared successfully by a combined method of direct current (DC) magnetron sputtering and anodic oxidation. The doping amount of Mo can be modified by changing the number of molybdenum blocks on the Ti target while a Ti–Mo alloy film is prepared by magnetron sputtering on a metal Ti substrate, following a Mo-doped TiO2 nanotube array grown by anodization. Morphology test shows that the doping of Mo could inhibit the phase transition and growth of crystal of TiO2. X-ray photoelectron spectroscopy (XPS) results show that Mo has successfully been embedded in the TiO2 crystal lattice and mainly exists in the valence states of Mo6+. Mo-doping samples show slightly increased visible light absorption as the red shift of TiO2 absorption edge with the band gap dropping from 3.24 to 3.16 eV with 0.5 at.% Mo doping. The enhanced photocurrent is demonstrated for a 0.5 at.% Mo-doped TiO2 electrode. Through photoelectric performance testing under UV-visible light irradiation, the nanotube array film with a Mo-doped content of 0.5% produced the maximum photocurrent density, which is about four times the undoped TiO2 nanotube array film, exhibiting a considerable photoelectric effect gain. The controllable Mo doping TiO2 nanotube array film prepared by this combining technique is expected as a promising material for efficient applications in photoelectric conversion.

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Enhancement of photoelectric and photocatalytic activities: Mo doped TiO2 thin films deposited by sputtering

Cited by 37 publications

References 17 publications

Encapsulating Mo-Doped TiO2 Anatase in N-Doped Amorphous Carbon With Excellent Lithium Storage Performances

Encapsulating Mo-Doped TiO2 Anatase in N-Doped Amorphous Carbon With Excellent Lithium Storage Performances

Enhanced Photocatalytic Activity of Titania by Co-Doping with Mo and W

Enhanced Photoelectrochemical Properties from Mo-Doped TiO2 Nanotube Arrays Film

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