Preparation and visible-light photocatalysis of hollow rock-salt TiO1−xNx nanoparticles

Seo, Seung In; Park, Cheol Hee; Kim, Ha Yeong; Nam, Woo Hyun; Jeong, Mahn; Choi, Yong Nam; Lim, Young Soo; Seo, Won Seon; Kim, Sung Jin; Lee, Jun Young; Cho, Yong Soo

doi:10.1039/c3ta00936j

Cited by 19 publications

(8 citation statements)

References 22 publications

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“…Finally, we should note that in the case of the TiON–Ir the Ir geometric loading is approximately 150-fold smaller than in PEM electrolyzers with the best state-of-the-art performance . We note that loadings of such low range are not expected to be incorporated in the real OER anode just yet, but the TiON–Ir composite could pave the way for lowering Ir content …”

Section: Resultsmentioning

confidence: 93%

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Increasing the Oxygen-Evolution Reaction Performance of Nanotubular Titanium Oxynitride-Supported Ir Nanoparticles by a Strong Metal–Support Interaction

et al. 2020

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This study targets one of the grand challenges of electrochemical hydrogen production: a durable and cost-effective oxygen-evolution catalyst. We present a thin-film composite electrode with a unique morphology and an ultralow loading of iridium that has extraordinary electrocatalytic properties. This is accomplished by the electrochemical growth of a defined, high-surface-area titanium oxide nanotubular film, followed by the nitridation and effective immobilization of iridium nanoparticles. The applicative relevance of this production process is justified by a high oxygen-evolution reaction (OER) activity and high stability. Enhanced OER performance is due to the strong metal–support interaction (SMSI). The high durability is achieved by self-passivation of the titanium oxynitride (TiON) surface layer with TiO2, which in addition also effectively embeds the Ir nanoparticles while still keeping them electrically wired. An additional contribution to the enhanced durability comes from the nitrogen atoms, which according to our density functional theory (DFT) calculations reduce the tendency of the Ir nanoparticles to grow. Materials are analyzed by advanced electrochemical characterization techniques. Namely, the entire process of the TiON–Ir electrode’s preparation and the electrochemical evaluation can be tracked with scanning electron microscopy, X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) at identical locations. In general, the experimental approach allows for the unique morphological, structural, and compositional insights into the preparation and electrocatalytic performance of thin films, making it useful also outside electrocatalysis applications.

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Section: Resultsmentioning

confidence: 93%

“…16 We note that loadings of such low range are not expected to be incorporated in the real OER anode just yet, but the TiON−Ir composite could pave the way for lowering Ir content. 77…”

Section: Resultsmentioning

confidence: 99%

Increasing the Oxygen-Evolution Reaction Performance of Nanotubular Titanium Oxynitride-Supported Ir Nanoparticles by a Strong Metal–Support Interaction

et al. 2020

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“…First, TiO contains more than 15% vacancies on both Ti and O sites depending on its stoichiometry, resulting in a rock salt structure with plenty of defects. 28 This suggests that the oxygen vacancy (O-vacancy) sites could serve as a good place for N atom incorporation. Second, the Ti 2+ species could donate electrons to incoming N atoms to render them stabilized in the form of N 3À .…”

Section: Resultsmentioning

confidence: 99%

A hollow titanium oxynitride nanorod array as an electrode substrate prepared by the hot ammonia-induced Kirkendall effect

Han

Bang

2014

J. Mater. Chem. A

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The Kirkendall effect has been widely employed for the preparation of hollow nanostructures along with galvanic replacement and Ostwald ripening as a non-templating method. Despite many successful demonstrations for Kirkendall void formation, they have been mostly confined to the synthesis of hollow metal oxides and sulfides. In this work, we explored the feasibility of the Kirkendall effect for the preparation of a nitride compound in an effort to extend its peculiar merits, and discovered a new mechanism of Kirkendall void formation in the synthesis of hollow titanium oxynitride arrays by the nitridation of TiO 2 . Our in-depth study revealed that the reduction power of hot NH 3 played a crucial role in the formation of the Kirkendall void. When employed as an electrode substrate for supercapacitor applications, the hollow titanium oxynitride array showed a superior capacitive performance, which is ascribed to its high electrical conductivity and low density.

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“…[7][8][9][10] One of the most notable photocatalysts is TiO 2 , which however has limitations in visible light absorption. 11,12 BiOBr (bismuth oxybromide) as a relatively new member of the family of photocatalysts has been demonstrated to be a promising photocatalyst that has suitable band gap, can degrade a wide range of toxic organic pollutants and metal ions in water under visible light illumination, and shows good chemical stability and is eco-friendly. [13][14][15][16][17] Previous studies have revealed that the photocatalytic activity of BiOBr is determined by not only the surface atomic structure, but also the grain size, morphology and structure, and dominantly exposed facets.…”

Section: Introductionmentioning

confidence: 99%

Titanium alkoxide induced BiOBr–Bi2WO6 mesoporous nanosheet composites with much enhanced photocatalytic activity

et al. 2013

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Here we report a facile hydrothermal route for the preparation of BiOBr-Bi 2 WO 6 mesoporous nanosheet composites (MNCs) in the presence of titanium isopropoxide, Ti(O i Pr) 4 . High resolution transmission electron microscopy, X-ray diffraction, nitrogen adsorption/desorption analysis and X-ray photoelectron spectroscopy were employed for structural and composition analyses of the MNCs. The photogenerated charge transfer and photocatalytic activity of BiOBr-Bi 2 WO 6 MNCs were investigated by Kelvin probe force microscopy and UV-vis spectroscopy. We propose mechanisms to illustrate how titanium alkoxide induces the formation of mesoporous nanosheet heterostructures and the enhanced photodecomposition efficiency of the dye under low light intensity illumination. Overall, our results suggest that titanium alkoxide is not only strongly involved in the growth of BiOBr (001) facets, but also plays a critical role in the pore evolution of the product. Kelvin probe force microscopy analysis allows us to conclude that the resulting nanocomposites demonstrate high photogenerated charge mobility and a long lifetime. Dye molecules can be rapidly and thoroughly decomposed with the photocatalyst under very low light intensity illumination. The enhanced photocatalytic activity is attributed to well matched band edge positions of BiOBr and Bi 2 WO 6 and the large specific surface area of the MNCs in view of the incorporation of mesopores and the highly exposed BiOBr (001) facet due to the use of Ti(O i Pr) 4 during the synthesis. The results presented here are expected to make a contribution toward the development of delicate nanocomposites for photocatalytic water purification and solar energy utilization.

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Preparation and visible-light photocatalysis of hollow rock-salt TiO1−xNx nanoparticles

Cited by 19 publications

References 22 publications

Increasing the Oxygen-Evolution Reaction Performance of Nanotubular Titanium Oxynitride-Supported Ir Nanoparticles by a Strong Metal–Support Interaction

Increasing the Oxygen-Evolution Reaction Performance of Nanotubular Titanium Oxynitride-Supported Ir Nanoparticles by a Strong Metal–Support Interaction

A hollow titanium oxynitride nanorod array as an electrode substrate prepared by the hot ammonia-induced Kirkendall effect

Titanium alkoxide induced BiOBr–Bi2WO6 mesoporous nanosheet composites with much enhanced photocatalytic activity

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