Controlling Disorder and Superconductivity in Titanium Oxynitride Nanoribbons with Anion Exchange

Sluban, Melita; Umek, Polona; Jagličić, Zvonko; Buh, Jože; Smitek, Petra; Mrzel, Aleš; Bittencourt, Carla; Guttmann, Peter; Delville, Marie‐Hélène; Mihailović, D.; Arčon, Denis

doi:10.1021/acsnano.5b03742

Cited by 25 publications

(27 citation statements)

References 52 publications

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“…Figure 1d) are related to the cubic iridium: 2θ = 41,0°and 47.6°(International Centre for Diffraction Data, JCPDS 00-001-1212), and to the cubic titanium oxynitride: 2θ = 37.2°a nd 43.2°(TiO x N y with x + y � 1 as described in Ref. [29]). Broad diffraction peaks of iridium nanoparticles are due to the small particle size seen at STEM micrographs in Figure 1b Figure S1 and S2 in the Supporting Information).…”

Section: Introductionmentioning

confidence: 99%

Towards Stable and Conductive Titanium Oxynitride High‐Surface‐Area Support for Iridium Nanoparticles as Oxygen Evolution Reaction Electrocatalyst

et al. 2019

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The rational design of electrochemical oxygen evolution reaction (OER) electrocatalyst is essential for the development of efficient and sustainable electrochemical energy conversion, storage and electrolysis applications. One of the remaining limitations of the low‐temperature electrolyzers is the large amounts of highly scarce and expensive iridium used as the OER electrocatalysts. This could be solved by applying much smaller amounts of iridium on efficient and stable support. Here we present a very promising functionality of titanium oxynitride (TiONx) high‐surface‐area support that effectively disperses the iridium nanoparticles, exhibits good intrinsic electrical conductivity and stability and thus promises efficient reduction of the noble‐metal loading in electrolyzers gas diffusion electrodes. The new nanocomposite made of approximately 3 nm‐sized iridium nanoparticles finely dispersed on TiONx support is produced using a novel synthetic route. Extensive characterization shows that the new composites exhibit an electronic interaction with the support and, ultimately, a high OER performance in acidic media.

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Section: Introductionmentioning

confidence: 99%

Towards Stable and Conductive Titanium Oxynitride High‐Surface‐Area Support for Iridium Nanoparticles as Oxygen Evolution Reaction Electrocatalyst

et al. 2019

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“…For oxynitrides, the oxidation state of the cations, the bond covalence and the band structure can be tuned by mixing oxygen and nitrogen. The wide range of electronic and optical properties make them promising candidates for photocatalysis [1,2], electronic [3,4,5] and solar energy applications [6].…”

Section: Introductionmentioning

confidence: 99%

Compositional effects on the electrical properties of extremely disordered molybdenum oxynitrides thin films

Hofer

Bengió

Rozas

et al. 2020

Materials Chemistry and Physics

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We report on the influence of the chemical composition on the electronic properties of molybdenum oxynitrides thin films grown by reactive sputtering on Si (100) substrates at room temperature. The partial pressure of Ar was fixed at 90 %, and the remaining 10 % was adjusted with mixtures N 2 :O 2 (varying from pure N 2 to pure O 2 ). The crystalline and electronic structures and the electrical transport of the films depend on the chemical composition. Thin films grown using oxygen mixtures up 2 % have γ-Mo 2 N phase and display superconductivity. The superconducting critical temperature T c reduces from ~ 6.8 K to below 3.0 K as the oxygen increases. On the other hand, films grown using oxygen mixtures richer than 2 % are mostly amorphous. The electrical transport shows a semiconductor-like behavior with variable-range hopping conduction at low temperatures. The analysis of the optical properties reveals that the samples have not a defined semiconductor band gap, which can be related to the high structural disorder and the excitation of electrons in a wide range of energies.

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“…Both films shown in Figure 3 were annealed at 450 °C for 1 h. (Figure 2d). 39 In the last step, Ir nanoparticles were deposited; however, they are too small in terms of size and quantity to be visible in the SEM micrograph of Figure 2e. An animation, showing the morphological changes throughout the synthesis process, is available online in the Supplementary Data video clip.…”

Section: Dft Calculationsmentioning

confidence: 99%

Nanotubular Titanium Oxynitride with an Ultra-Low Iridium Loading as a High-Performance Oxygen-Evolution-Reaction Thin-Film Electrode

Bele¹,

Jovanovič²,

Marinko³

et al. 2020

Preprint

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The present 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 ultra-low 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 remarkable oxygen-evolution reaction (OER) activity and high stability. Due to the confinement inside the pores and the strong metal-support interaction (SMSI) effects, the OER exhibited a higher turnover. The high durability is achieved by self-passivation of the titanium oxynitride (TiON) surface layer with TiO<sub>2</sub>, 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 DFT calculations reduce the tendency of the Ir nanoparticles to grow. We also introduce an advanced electrochemical characterization platform for the in-depth study of thin-film electrodes. 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 novel 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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Controlling Disorder and Superconductivity in Titanium Oxynitride Nanoribbons with Anion Exchange

Cited by 25 publications

References 52 publications

Towards Stable and Conductive Titanium Oxynitride High‐Surface‐Area Support for Iridium Nanoparticles as Oxygen Evolution Reaction Electrocatalyst

Towards Stable and Conductive Titanium Oxynitride High‐Surface‐Area Support for Iridium Nanoparticles as Oxygen Evolution Reaction Electrocatalyst

Compositional effects on the electrical properties of extremely disordered molybdenum oxynitrides thin films

Nanotubular Titanium Oxynitride with an Ultra-Low Iridium Loading as a High-Performance Oxygen-Evolution-Reaction Thin-Film Electrode

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