New fine structures resolved at the ELNES Ti-L2,3 edge spectra of anatase and rutile: Comparison between experiment and calculation

Cheynet, M.C.; Pokrant, Simone; Irsen, Stephan; Krüger, Péter

doi:10.1016/j.ultramic.2010.03.001

Cited by 24 publications

(22 citation statements)

References 35 publications

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“…In this first sample, both amorphous and anatase TiO 2 are observed, respectively on the top and bottom surfaces and on the sidewalls (see Figures 2B, 2D–2F), and confirmed by the Ti‐L 2,3 fine structures shown in Figure 2C, which are a signature of the TiO 2 degree of crystalinity [ 26 ] and crystal structure. [ 27–30 ] The distribution of amorphous and anatase TiO 2 was confirmed in multiple areas of the TEM specimen (see Figure S5 and S6). As an additional feature, a SiO x intermediate layer has been observed below the TiO 2 layer (see Figure S4), which may play a role in the carrier lifetime of the structure under operation.…”

Section: Resultsmentioning

confidence: 86%

Two‐dimensional photonic metasurfaces for slow light‐controlled photocatalysis

et al. 2021

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Photocatalysis using semiconductor materials like titania (TiO2) is a key method for environmental purification or solar fuel generation. Nanostructures that maximize incident light absorption are highly desired to enhance depollution rate or solar‐to‐fuel conversion efficiency in limited volumes of catalysts. Here, we report on structural and optical properties of metasurfaces based on a 20 nm thick anatase layer conformally deposited onto a wavelength‐scale two‐dimensional periodic photonic lattice. We investigate the NO degradation using such metasurfaces, and evaluate the impact of the patterning on photocatalytic activities between 340 and 400 nm. In the 380–385 nm range, the mean photochemical efficiency is increased by a factor up to 5.7 compared to flat references, with an overall three‐fold enhancement within the whole spectral range of interest. This approach can be applied to numerous types of systems by varying active materials, leading to substantial improvements in air/water depollution, water splitting or artificial photosynthesis processes.

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Section: Resultsmentioning

confidence: 86%

Two‐dimensional photonic metasurfaces for slow light‐controlled photocatalysis

et al. 2021

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“…Furthermore, the L 3 e g peak of both rutile and anatase is asymmetric, whereas it is not in NTO. Monochromated EELS measurements of Cheynet et al [ 64 ] show that this asymmetry is due to a splitting of the L 3 e g peak into two to three single peaks depending on the actual TiO 2 modification. Also, the L 2 edge exhibits some differences that need to be addressed.…”

Section: Resultsmentioning

confidence: 99%

Towards a Greener and Scalable Synthesis of Na₂Ti₆O₁₃ Nanorods and Their Application as Anodes in Batteries for Grid‐Level Energy Storage

et al. 2020

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Grid applications require high power density (for frequency regulation, load leveling, and renewable energy integration), achievable by combining multiple batteries in a system without strict high capacity requirements. For these applications however, safety, cost efficiency, and the lifespan of electrode materials are crucial. Titanates, safe and longevous anode materials providing much lower energy density than graphite, are excellent candidates for this application. The innovative molten salt synthesis approach proposed in this work provides exceptionally pure Na 2 Ti 6 O 13 nanorods generated at 900-1100 C in a yield ≥80 wt%. It is fast, costefficient, and suitable for industrial upscaling. Electrochemical tests reveal stable performance providing capacities of %100 mA h g À1 (Li) and 40 mA h g À1 (Na). Increasing the synthesis temperature to 1100 C leads to a capacity decrease, most likely resulting from 1) the morphology/volume change with the synthesis temperature and 2) distortion of the Na 2 Ti 6 O 13 tunnel structure indicated by electron energy-loss and Raman spectroscopy. The suitability of pristine Na 2 Ti 6 O 13 as the anode for grid-level energy storage systems has been proven a priori, without any performance-boosting treatment, indicating considerable application potential especially due to the high yield and low cost of the synthesis route.

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“…The hybrid structure of anatase/rutile can therefore be reliably diagnosed through a high-resolution EELS analysis, and the differences in the Ti L 2,3 edge between anatase and rutile can be detected. 23,24 Equally important, the internal structure can be revealed by electron tomography using 3D reconstruction. [25][26][27][28][29][30] It allows us to map the distribution of anatase and rutile and image the internal structure of the as-synthesized core-shell microspheres by advanced TEM.…”

Section: Introductionmentioning

confidence: 99%

One-Step Microheterogeneous Formation of Rutile@Anatase Core–Shell Nanostructured Microspheres Discovered by Precise Phase Mapping

Tarasov

Meledina

et al. 2017

J. Phys. Chem. C

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Nanostructured core-shell microspheres with a rough rutile core and a thin anatase shell are synthesized via a one-step heterogeneous templated hydrolysis process of TiCl 4 vapor on the aerosol water-air interface. The rutile-in-anatase core-shell structure has been evidenced by different electron microscopy techniques, including electron energy-loss spectroscopy (EELS) and 3D electron tomography.A new mechanism for the formation of a crystalline rutile core inside the anatase shell is proposed based on a statistical evaluation of a large number of electron microscopy data. We found that the control over the TiCl 4 vapor pressure, the ratio between TiCl 4 and H 2 O aerosol, and the reaction conditions plays a crucial role in the formation of the core-shell morphology and increases the yield of nanostructured microspheres.

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New fine structures resolved at the ELNES Ti-L2,3 edge spectra of anatase and rutile: Comparison between experiment and calculation

Cited by 24 publications

References 35 publications

Two‐dimensional photonic metasurfaces for slow light‐controlled photocatalysis

Two‐dimensional photonic metasurfaces for slow light‐controlled photocatalysis

Towards a Greener and Scalable Synthesis of Na₂Ti₆O₁₃ Nanorods and Their Application as Anodes in Batteries for Grid‐Level Energy Storage

One-Step Microheterogeneous Formation of Rutile@Anatase Core–Shell Nanostructured Microspheres Discovered by Precise Phase Mapping

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New fine structures resolved at the ELNES Ti-L2,3 edge spectra of anatase and rutile: Comparison between experiment and calculation

Cited by 24 publications

References 35 publications

Two‐dimensional photonic metasurfaces for slow light‐controlled photocatalysis

Two‐dimensional photonic metasurfaces for slow light‐controlled photocatalysis

Towards a Greener and Scalable Synthesis of Na2Ti6O13 Nanorods and Their Application as Anodes in Batteries for Grid‐Level Energy Storage

One-Step Microheterogeneous Formation of Rutile@Anatase Core–Shell Nanostructured Microspheres Discovered by Precise Phase Mapping

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Towards a Greener and Scalable Synthesis of Na₂Ti₆O₁₃ Nanorods and Their Application as Anodes in Batteries for Grid‐Level Energy Storage