Low-temperature Synthesis of BaTaO<sub>2</sub>N via the Flux Method Using NaNH<sub>2</sub>

Setsuda, Yuki; Maruyama, Yuki; Izawa, Chihiro; Watanabe, Tomoaki

doi:10.1246/cl.170267

Cited by 17 publications

(10 citation statements)

References 19 publications

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“…For example, after treating the Ba(OH) 2 and TaCl 5 mixture at 220 °C for 20 h using NaNH 2 as the flux, BTON with higher crystallinity and lower defect density of nitrogen vacancies and/or reduced Ta 5+ species can be obtained, resulting in appreciable photocatalytic activity under visible light irradiation. [ 50 ] By employing NaNH 2 and ammonia as the flux and reaction medium, BTON with improved crystallinity and lesser lattice defects can be successfully synthesized, exhibiting photocatalytic H 2 and O 2 evolution activities. [ 51 ] Even though the performance of NaNH 2 ‐treated BTON is low, the preparation temperatures of (oxy)nitrides are relatively low.…”

Section: Bulk Structural Regulation Of the Nanophotocatalystmentioning

confidence: 99%

Nanostructure Engineering and Modulation of (Oxy)Nitrides for Application in Visible‐Light‐Driven Water Splitting

Dong

Cui

et al. 2021

Advanced Materials

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(Oxy)nitride‐based nanophotocatalysts have been extensively investigated for solar‐to‐chemical conversion, and not only allow wide spectral utilization to achieve high theoretical energy conversion efficiency but also exhibit suitable conduction and valence band positions for robust reduction and oxidation of water. During the past decades, a few reviews on the research progress in designing and synthesizing new visible‐light‐responsive semiconductors for various applications in solar‐to‐chemical conversion have been published. However, those on the effects of their bulk and composite (surface/interface) nanostructures on basic processes as well as solar water splitting performances to produce hydrogen are still limited. In this review, a brief introduction on the relationship between the nanostructure photocatalytic properties is included. Three main processes of solar water splitting are involved, allowing the elucidation of the correlation with the nanostructural properties of the photocatalyst such as surface/interface, size, morphology, and bulk structure. Subsequently, the development of methodologies and strategies for modulating the bulk and composite structures to improve the efficiencies of the basic processes, particularly charge separation, is summarized in detail. Finally, the prospects of (oxy)nitride‐based photocatalysts such as controlled synthesis, modulation of 1D/2D morphology, exposed facet regulation, heterostructure formation, theoretical simulation, and time‐ and space‐resolved spectroscopy are discussed.

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Section: Bulk Structural Regulation Of the Nanophotocatalystmentioning

confidence: 99%

Nanostructure Engineering and Modulation of (Oxy)Nitrides for Application in Visible‐Light‐Driven Water Splitting

Dong

Cui

et al. 2021

Advanced Materials

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“…It has been reported that metal nitrides and oxynitrides can be synthesized from metal oxide precursors with molten NaNH 2 salts. − Metal oxynitrides, such as BaTaO 2 N and BaNbO 2 N, have been synthesized using NaNH 2 as a nitriding agent. However, because NaNH 2 is extremely sensitive, these syntheses are difficult to scale-up.…”

Section: Introductionmentioning

confidence: 99%

Environmentally Benign Synthesis and Color Tuning of Strontium–Tantalum Perovskite Oxynitride and Its Solid Solutions

et al. 2021

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A facile method was successfully developed to prepare strontium-tantalum perovskite oxynitride, SrTaO 2 N, and its solid solutions. Urea was employed as a solid nitriding agent to eliminate the use of toxic NH 3 gas. In addition, utilization of sol-gel derived Ta 2 O 5 gel as a Ta precursor allowed for completion of nitridation within a shorter period and at a lower calcination temperature compared with the conventional ammonolysis process. Optimization of the reaction conditions, such as the urea content, allowed for production of solid solutions of SrTaO 2 N and Sr 1.4 Ta 0.6 O 2.9 . The products exhibited optical absorption and chromatic colors because of the narrower band gaps of oxynitrides compared with those of oxides. The O/N ratios of the solid solutions were easily adjusted by varying the amount of urea in the mixture of precursor. As a result, the colors of the products ranged from yellow to brown. The nitridation process and products developed in this study are interesting environmentally-benign alternatives to conventional inorganic pigments.

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“…This indicated that the NH 3 gas released from the thermal decomposition of urea did not directly cause nitridation of the La 2 Ti 2 O 7 precursor. [37][38][39][40][41] Preparation of perovskite metal oxynitrides, such as BaTaO 2 N [40] and BaNbO 2 N, [41] using NaNH 2 as a nitriding agent has also been achieved by the flux method and explosive reactions. Normally, the ammonolysis is carried out at temperatures between 800 and 1300°C and requires a long duration to complete the diffusion of nitrogen.…”

Section: Introductionmentioning

confidence: 99%

Preparation of LaTiO₂N Using Hydrothermally Synthesized La₂Ti₂O₇ as a Precursor and Urea as a Nitriding Agent

et al. 2019

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A facile method was successfully developed to prepare perovskite-type metal oxynitrides, LaTiO 2 N, from La 2 Ti 2 O 7 as a precursor in an atmosphere of N 2 . Urea was employed as a solid-state nitriding agent, instead of gaseous NH 3 , to increase the safety of the reaction. The hydrothermally prepared La 2 Ti 2 O 7 precursor had a nanosheet morphology and contained La(OH) 3 as a by-product. Through the optimization of reaction conditions including heat-treatment temperature and content [a]

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Low-temperature Synthesis of BaTaO₂N via the Flux Method Using NaNH₂

Cited by 17 publications

References 19 publications

Nanostructure Engineering and Modulation of (Oxy)Nitrides for Application in Visible‐Light‐Driven Water Splitting

Nanostructure Engineering and Modulation of (Oxy)Nitrides for Application in Visible‐Light‐Driven Water Splitting

Environmentally Benign Synthesis and Color Tuning of Strontium–Tantalum Perovskite Oxynitride and Its Solid Solutions

Preparation of LaTiO₂N Using Hydrothermally Synthesized La₂Ti₂O₇ as a Precursor and Urea as a Nitriding Agent

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Low-temperature Synthesis of BaTaO2N via the Flux Method Using NaNH2

Cited by 17 publications

References 19 publications

Nanostructure Engineering and Modulation of (Oxy)Nitrides for Application in Visible‐Light‐Driven Water Splitting

Nanostructure Engineering and Modulation of (Oxy)Nitrides for Application in Visible‐Light‐Driven Water Splitting

Environmentally Benign Synthesis and Color Tuning of Strontium–Tantalum Perovskite Oxynitride and Its Solid Solutions

Preparation of LaTiO2N Using Hydrothermally Synthesized La2Ti2O7 as a Precursor and Urea as a Nitriding Agent

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Low-temperature Synthesis of BaTaO₂N via the Flux Method Using NaNH₂

Preparation of LaTiO₂N Using Hydrothermally Synthesized La₂Ti₂O₇ as a Precursor and Urea as a Nitriding Agent