Fabrication of Ta2O5 films on tantalum substrate for efficient photocatalysis

Li, Juxia; Dai, Weili; Wu, Guangjun; Guan, Naijia; Li, Landong

doi:10.1016/j.catcom.2015.02.006

Cited by 39 publications

(15 citation statements)

References 22 publications

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“…The binding energy of Nb 5+ in NNO or NTO is lower than that of Nb 5+ in pure Nb 2 O 5 (207.7, 210.4 eV) . Ta 4f 7/2 and 4f 5/2 peaks of NTO or NTO F appear at 25.7 or 26.3 eV and 27.6 or 29.0 eV, respectively, indicating the existence of Ta species in the form of Ta 5+ in agreement with literature data . The doublet with line splitting of 1.9 eV is notable for the 4f 5/2 and 4f 7/2 components in Ta 2 O 5 .…”

Section: Resultssupporting

confidence: 88%

“…The peaks of Nb 3d centered at 207.0 and 209.7 eV can be assigned to 3d 5/2 and 3d 3/2 states, respectively, which are identical to the binding energies for Nb 3d (Nb 5+ ) in Nb 2 O 5 . The Ta 4f 7/2 and Ta 4f 5/2 peaks appear at 25.7 and 27.6 eV, respectively, indicating the existence of Ta 5+ species which is in agreement with the literature . The relative atomic concentrations (at.…”

Section: Resultssupporting

confidence: 88%

“…Any particular niobate or tantalate can be characterized by a set of binding energies (BE) related to maximums of Nb 3d or Ta 4f and O 1s lines. However, a significant scattering exists in binding energy values reported in the literature Nb 3d 3/2 (210 eV) and Nb 3d 5/2 (207 eV) or Ta 4f 5/2 (28 eV) and Ta 4f 7/2 (26 eV) components even for such stable compounds as Nb 2 O 5 or Ta 2 O 5 . The binding energy differences Δ(O―Nb) = B E (O 1s) − B E (Nb 3d 5/2 ) and Δ(O―Ta) = B E (O 1s) − B E (Ta 4f 7/2 ) are suitable parameters to characterize average Nb―O bonding in niobates (322.2‐323.6 eV) and Ta―O bonding in tantalates (502.7‐504.4 eV) …”

Section: Introductionmentioning

confidence: 97%

“…HR XPS spectra of Nd 3d, Nb 3d, Ta 4f, and O 1s and deconvolution peaks for NNO F and NTO F thin films data 29,48. The doublet with line splitting of 1.9 eV is notable for the 4f 5/2 and 4f 7/2 components in Ta 2 O 5 15,31.…”

mentioning

confidence: 94%

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X‐ray photoelectron spectroscopy study of neodymium niobate and tantalate precursors and thin films

Bruncková

Kolev

Kaňuchová

2018

Surface & Interface Analysis

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Neodymium niobate NdNbO4 (NNO) and tantalate NdTaO4 (NTO) thin films (~100 nm) were prepared by sol‐gel/spin‐coating process on Al2O3 substrate with LaNbO4/PbZrO3 interlayer and annealing at 1000°C. Surface chemistry was investigated by X‐ray photoelectron spectroscopy (XPS). The core‐level XPS studies of sol‐gel NNO and NTO were performed for the first time. The binding energy differences Δ(O―Nb) and Δ(O―Ta) were used to characterize average energies of Nb―O bonding in NNO (322.9 eV) and Ta―O bonding in NTO (504.2 eV). The XPS demonstrated single valence state of Nd (Nd3+) in precursors. Nd concentration (at. %) decreases from 22% in precursors to 7% in films considering the substrate contains C, Al, Si, Pb, and Zr elements (37%) at Nb or Ta (5%) and O (51%). The X‐ray diffraction analyses verified formation of the monoclinic (M‐NdNbO4 or M′‐NdTaO4), orthorhombic (O‐NdNbO4) and tetragonal (T‐NdTaO4) phases in precursors and films. Single valence state of Nd3+ was confirmed in these films designed for the application in environmental electrolytic thin film devices.

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Section: Resultssupporting

confidence: 88%

Section: Resultssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 97%

mentioning

confidence: 94%

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X‐ray photoelectron spectroscopy study of neodymium niobate and tantalate precursors and thin films

Bruncková

Kolev

Kaňuchová

2018

Surface & Interface Analysis

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“…Although pristine Ta 2 O 5 can only be excited by UV irradiation with a wavelength below 318 nm, its advantage is the high photoactivity attributed to its band structure, i.e., relatively higher conduction band position than that of TiO 2 , which can result in the generation of electrons with a higher potential [3]. Hence, Ta 2 O 5 looks like a good candidate for the photocatalytic decomposition of pollutants in the gas and aqueous phases [4] or for hydrogen evolution [4,5]. Moreover, Ta 2 O 5 could be applied as corrosion-resistant material [6], thin-film catalyst [7], anti-reflective coating [8,9], an element of ultra-large-scale integrated circuits [10], or semiconductor precursor [11].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Durable Ordered Ta2O5 Nanotube Arrays Decorated with Bi2S3 Quantum Dots

et al. 2019

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One of the most important challenges in the fabrication of ordered tantalum pentaoxide (Ta2O5) nanotube arrays (NTs) via the electrochemical method is the formation of nanotubes that adhere well to the Ta substrate. In this paper, we propose a new protocol that allows tight-fitting Ta2O5 nanotubes to be obtained through the anodic oxidation of tantalum foil. Moreover, to enhance their activity in the photocatalytic reaction, in this study, they have been decorated by nontoxic bismuth sulfide (Bi2S3) quantum dots (QDs) via a simple successive ionic layer adsorption and reaction (SILAR) method. Transmission electron microscopy (TEM) analysis revealed that quantum dots with a size in the range of 6–11 nm were located both inside and on the external surfaces of the Ta2O5 NTs. The effect of the anodization time and annealing conditions, as well as the effect of cycle numbers in the SILAR method, on the surface properties and photoactivity of Ta2O5 nanotubes and Bi2S3/Ta2O5 composites have been investigated. The Ta2O5 nanotubes decorated with Bi2S3 QDs exhibit high photocatalytic activity in the toluene degradation reaction, i.e., 99% of toluene (C0 = 200 ppm) was degraded after 5 min of UV-Vis irradiation. Therefore, the proposed anodic oxidation of tantalum (Ta) foil followed by SILAR decorating allows a photocatalytic surface, ready to use for pollutant degradation in the gas phase, to be obtained.

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Synthesis of tantalum oxynitride with enhanced visible light efficiency in photoreduction of carbon dioxide

Lệ

Tùng

Hoàng

et al. 2018

Vietnam Journal of Chemistry

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The tantalum oxynitride (TaON) content in preparation process was increased with the melamine and tantalum pentoxide (Ta2O5) mass ratios. The Ta2O5 nitridation by melamine (C3H6N6) was occured in at 850 °C for 4 hours with various melamine and tantalum pentoxide mass ratios under a nitrogen gas flow. The photocatalytic performance of prepared samples was evaluated by the photoreduction of carbon dioxide into renewable fuel under visible light irradiation. Results show that the obtained photocatalysts exhibited a significant enhanced photocatalytic activity in comparison with pure Ta2O5. This work may be useful for a facile way to synthesize the highly efficient photocatalyst for application in energy conversion.

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Fabrication of Ta2O5 films on tantalum substrate for efficient photocatalysis

Cited by 39 publications

References 22 publications

X‐ray photoelectron spectroscopy study of neodymium niobate and tantalate precursors and thin films

X‐ray photoelectron spectroscopy study of neodymium niobate and tantalate precursors and thin films

Fabrication of Durable Ordered Ta2O5 Nanotube Arrays Decorated with Bi2S3 Quantum Dots

Synthesis of tantalum oxynitride with enhanced visible light efficiency in photoreduction of carbon dioxide

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