In situ green oxidation synthesis of Ti3+ and N self-doped SrTiOxNy nanoparticles with enhanced photocatalytic activity under visible light

Liu, Jiandong; Ma, Xinbin; Yang, Lina; Liu, Xingliang; Han, Aijun; Lv, Haitang; Zhang, Chao; Xu, Shiai

doi:10.1039/c7ra13523h

Cited by 17 publications

(6 citation statements)

References 32 publications

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“…Secondly, the NTO/Pt/Ni catalyst has a higher surface area and pore volume than the other samples, implying a higher number of active sites for adsorption of ethanol-water molecules. Third, according to XPS, calculated Ti 3+ /Ti 4+ ratios of the NTO/Ni/Pt catalyst present a higher quantity of oxygen vacancies which also correspond to reactive sites for the reaction [50]. Fourth, NTO/Pt/Ni apparently presents more Pt 2+ species than Pt 4+ ones, the Pt being the reduced species that is more efficient for photocatalytic hydrogen production [51][52][53].…”

Section: Catalysts Synthesismentioning

confidence: 96%

Photocatalytic Hydrogen Evolution Using Bi-Metallic (Ni/Pt) Na2Ti3O7 Whiskers: Effect of the Deposition Order

et al. 2019

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Photocatalytic hydrogen production through ethanol photo-reforming using Na2Ti3O7 whiskers increases if the sodium titanate is decorated with well-known metallic catalysts such as Ni and Pt. Whereas wet impregnation with nickel gives only a slight increase in the activity, photo-deposition of Pt increased the H2 production by more than one order of magnitude. Through the combination of both co-catalysts (Ni and Pt) a superior performance in terms of H2 production is further observed. However, hydrogen yield is largely enhanced (almost three-fold), up to 778 μmol·g−1·h−1, if the Pt is photo-deposited on the surface of the catalyst before wet impregnation with Ni species (NTO/Pt/Ni) compared to H2 yield (283 μmol·g−1·h−1) achieved with the catalyst prepared in the reverse order (NTO/Ni/Pt). Structural, morphological, optical, and chemical characterization was carried out in order to correlate physicochemical properties with their photocatalytic activity. The X-ray photoelectron spectroscopy (XPS) results show a higher concentration of Pt2+ species if this metallic layer is under the nickel oxide layer. Moreover, X-ray diffraction patterns (XRD) show that Na2Ti3O7 surface is modified for both metal decoration processes.

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Section: Catalysts Synthesismentioning

confidence: 96%

Photocatalytic Hydrogen Evolution Using Bi-Metallic (Ni/Pt) Na2Ti3O7 Whiskers: Effect of the Deposition Order

et al. 2019

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“…For example, the Ti 3+ self-doped SrTiO 3 samples prepared in this paper are more stable than Ti–N doped SrTiO 3 samples compared to currently available studies. 38 The results showed that the Ti 3+ self-doped strontium titanate prepared by the molten salt electrochemical method had good photocatalytic stability. The SEM of STO-1.8 after 8 cycles is shown in Fig.…”

Section: Resultsmentioning

confidence: 95%

Ultra-fast synthesis of the high performance photocatalytic Ti³⁺ self-doped strontium titanate by an electrochemical assist in molten salt: effect of electrochemical potential

Wang,

Liu,

et al. 2024

J. Mater. Chem. A

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“…These two peaks further deconvoluted into four peaks, which are Ti 3+ 2p 3/2 (458.7 eV), Ti 4+ 2p 3/2 (459.6 eV), Ti 3+ 2p 1/2 (464 eV), and Ti 4+ 2p 1/2 (465.1 eV). 39,40 In S0, the intensity and area of Ti +3 peaks are significantly higher than those of Ti +4 peaks, confirming the oxygen-deficient nature of the pure TiO 2 nanotube array. However, in SrTiO 3 −TiO 2 heterostructured nanotube array samples, oxygen deficiency is diminished, and Ti 4+ peaks are dominated over Ti +3 (Figure 4a).…”

Section: ■ Experimental Sectionmentioning

confidence: 82%

SrTiO₃–TiO₂ Heterostructured Nanotube Arrays for Ultrafast Ethanol Sensing

Bhardwaj

Hazra

2022

ACS Appl. Nano Mater.

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Diverse metal oxide semiconductors have bloomed in chemical sensing applications providing opportunities and challenges. In this work, SrTiO 3 −TiO 2 heterostructured nanotube arrays were well designed via the electrochemical synthesis of TiO 2 nanotubes, followed by a facile one-step hydrothermal route by varying the amount of Sr(OH) 2 •8H 2 O precursor (0.25−25 mM) to grow different quantities of SrTiO 3 on TiO 2 nanotubes. The crystalline nature, morphology, and synthesis mechanism of the nanotube array were fully elucidated. Vertically aligned SrTiO 3 − TiO 2 heterostructured nanotube arrays were then sandwiched between the Ti bottom electrode (substrate as well) and Au top electrode to fabricate the metal−insulator−metal type sensors. SrTiO 3 −TiO 2 nanotube sensors exhibited ethanol-selective behavior where the highly defective SrTiO 3 layer acted as the main sensitive material that interacted with target species like ethanol. The SrTiO 3 −TiO 2 heterostructured nanotube array sensor synthesized with 0.25 mM Sr(OH) 2 precursor exhibited an excellent response magnitude (R a /R g ) of ∼556 with an ultrafast response time of 0.4 s toward 50 ppm ethanol at an operating temperature of 150 °C. Moreover, the sensor exhibits excellent stability, a low detection limit of 2.94 ppb, and good selectivity. All the SrTiO 3 −TiO 2 heterostructured nanotube array sensors showed promising humidity-tolerant behavior, and negligible change in response was obtained in the presence of 80% humid ambient air. The mechanism behind the modulated VOC sensing characteristics was explained with the comprehensive effects of the larger specific surface area, high surface defects, and modulated oxygen vacancies coming from the SrTiO 3 modification in the nanotube structures.

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In situ green oxidation synthesis of Ti³⁺ and N self-doped SrTiO_xN_y nanoparticles with enhanced photocatalytic activity under visible light

Abstract: A simple in situ green oxidation synthesis route was developed to prepare Ti3+ and N self-doped SrTiOxNy nanoparticles using TiN and H2O2 as precursors.

Cited by 17 publications

References 32 publications

Photocatalytic Hydrogen Evolution Using Bi-Metallic (Ni/Pt) Na2Ti3O7 Whiskers: Effect of the Deposition Order

Photocatalytic Hydrogen Evolution Using Bi-Metallic (Ni/Pt) Na2Ti3O7 Whiskers: Effect of the Deposition Order

Ultra-fast synthesis of the high performance photocatalytic Ti³⁺ self-doped strontium titanate by an electrochemical assist in molten salt: effect of electrochemical potential

SrTiO₃–TiO₂ Heterostructured Nanotube Arrays for Ultrafast Ethanol Sensing

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In situ green oxidation synthesis of Ti3+ and N self-doped SrTiOxNy nanoparticles with enhanced photocatalytic activity under visible light

Abstract: A simple in situ green oxidation synthesis route was developed to prepare Ti3+ and N self-doped SrTiOxNy nanoparticles using TiN and H2O2 as precursors.

Cited by 17 publications

References 32 publications

Photocatalytic Hydrogen Evolution Using Bi-Metallic (Ni/Pt) Na2Ti3O7 Whiskers: Effect of the Deposition Order

Photocatalytic Hydrogen Evolution Using Bi-Metallic (Ni/Pt) Na2Ti3O7 Whiskers: Effect of the Deposition Order

Ultra-fast synthesis of the high performance photocatalytic Ti3+ self-doped strontium titanate by an electrochemical assist in molten salt: effect of electrochemical potential

SrTiO3–TiO2 Heterostructured Nanotube Arrays for Ultrafast Ethanol Sensing

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In situ green oxidation synthesis of Ti³⁺ and N self-doped SrTiO_xN_y nanoparticles with enhanced photocatalytic activity under visible light

Ultra-fast synthesis of the high performance photocatalytic Ti³⁺ self-doped strontium titanate by an electrochemical assist in molten salt: effect of electrochemical potential

SrTiO₃–TiO₂ Heterostructured Nanotube Arrays for Ultrafast Ethanol Sensing