Amorphization of Degussa nanosized TiO2 caused by its modification

Khramov, Evgeny V.; Kotolevich, Yulia; Ramos, J.C. García; Pestryakov, Alexey; Zubavichus, Yan V.; Bogdanchikova, Nina

doi:10.1016/j.fuel.2018.06.127

Cited by 5 publications

(4 citation statements)

References 51 publications

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“…The parameters defining the first-shell distributions (i.e., R and σ 2 for I shell in Tables and ) are those measured with higher accuracy, as they are related both to the direct nearest-neighbor two-body signal and to several MS contributions. The best fit nearest-neighbor structural results are in good agreement with those of a previous analysis. , In light of these results, we can now apply the fitting procedure to the electrodes to follow the structural modifications induced by the sodiation effect.…”

Section: Resultssupporting

confidence: 85%

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Structural Study of Carbon-Coated TiO₂ Anatase Nanoparticles as High-Performance Anode Materials for Na-Ion Batteries

Greco

Mazzio

Dou

et al. 2019

ACS Appl. Energy Mater.

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In this work, we study the electronic and atomic structural modifications occurring in TiO 2 anatase nanoparticles as anode materials in Naion batteries upon sodiation and desodiation. The structural investigation is performed over both long-and short-range order by combining a comprehensive extended X-ray absorption fine structure (EXAFS) characterization with X-ray diffraction (XRD). The evolution of the electronic structure upon cycling is qualitatively investigated by X-ray absorption near-edge structure (XANES) analysis. The goal of this work is to correlate the outstanding electrochemical performance of carbon-coated TiO 2 anatase nanoparticles in sodium batteries with the electronic and structural modifications induced during the sodiation and desodiation processes upon cycling. This work also demonstrates for the first time a coherent explanation of the structural changes observed, where an electrochemically induced short-range ordering is revealed upon cycling.

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Section: Resultssupporting

confidence: 85%

“…The best fit nearest-neighbor structural results are in good agreement with those of a previous analysis. 32,39 In light of these results, we can now apply the fitting procedure to the electrodes to follow the structural modifications induced by the sodiation effect.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Structural Study of Carbon-Coated TiO₂ Anatase Nanoparticles as High-Performance Anode Materials for Na-Ion Batteries

Greco

Mazzio

Dou

et al. 2019

ACS Appl. Energy Mater.

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“…If one suggest the random distribution of Fe ions over the TiO 2 matrix for sample 4 (4.6 at. %), then the concentration of dimers does not exceed 5% for coordination number Z = 6 . The concentration of dimers estimated from the statistical approach turns out to be substantially less than the value obtained from fit of the experimental data by our model.…”

Section: Experimental Results and Discussioncontrasting

confidence: 58%

“…%), then the concentration of dimers does not exceed 5% for coordination number Z = 6. 55 The concentration of dimers estimated from the statistical approach turns out to be substantially less than the value obtained from fit of the experimental data by our model. It is approximately 10-fold higher concentration (sum of n d1 & n d2 ) as compared to the statistical model (see Table 4).…”

Section: ■ Experimental Results and Discussionmentioning

confidence: 58%

Formation of Fe–Fe Antiferromagnetic Dimers in Doped TiO₂:Fe Nanoparticles

et al. 2018

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In this work, we report the results of comprehensive experimental and theoretical study of magnetic properties of TiO 2 nanoparticles (20 nm) doped with Fe at various concentrations ranging from 0.1 to 4.6 at. %. Our electron paramagnetic resonance and magnetic measurements data evidence the mixed magnetic state, where paramagnetic Fe 3+ ions coexist with short-range antiferromagnetic correlations caused by negative exchange interaction between neighboring Fe 3+ ions. A quantum mechanical model of the Fe-based magnetic cluster represented as a set of dimers with strong ∼(100−300) K and weak (∼1 K) exchange interactions has been proposed. Our model was found to provide a good description of magnetic properties of TiO 2 :Fe nanopowders. Density-functional theory (DFT) calculations revealed Fe 3+ oxidation state of the iron center in the vicinity of an oxygen vacancy in the crystal structure of anatase. DFT calculations confirmed that two types of Fe 3+ spin-pairs with weak and strong exchange interactions can be formed in the vicinity of an oxygen vacancy. Accumulation of magnetic moment carriers and formation of magnetic clusters in TiO 2 nanoparticles with anatase structure were found to be a general tendency for all studied TiO 2 :Fe nanopowders.

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Efficient Degradation of Gas-Phase Toluene by Ozone-Assisted Photocatalytic Oxidation on TiO2/Graphene Composites

Wang

Liu

et al. 2019

Catal Lett

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Amorphization of Degussa nanosized TiO2 caused by its modification

Cited by 5 publications

References 51 publications

Structural Study of Carbon-Coated TiO₂ Anatase Nanoparticles as High-Performance Anode Materials for Na-Ion Batteries

Structural Study of Carbon-Coated TiO₂ Anatase Nanoparticles as High-Performance Anode Materials for Na-Ion Batteries

Formation of Fe–Fe Antiferromagnetic Dimers in Doped TiO₂:Fe Nanoparticles

Efficient Degradation of Gas-Phase Toluene by Ozone-Assisted Photocatalytic Oxidation on TiO2/Graphene Composites

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Amorphization of Degussa nanosized TiO2 caused by its modification

Cited by 5 publications

References 51 publications

Structural Study of Carbon-Coated TiO2 Anatase Nanoparticles as High-Performance Anode Materials for Na-Ion Batteries

Structural Study of Carbon-Coated TiO2 Anatase Nanoparticles as High-Performance Anode Materials for Na-Ion Batteries

Formation of Fe–Fe Antiferromagnetic Dimers in Doped TiO2:Fe Nanoparticles

Efficient Degradation of Gas-Phase Toluene by Ozone-Assisted Photocatalytic Oxidation on TiO2/Graphene Composites

Contact Info

Product

Resources

About

Structural Study of Carbon-Coated TiO₂ Anatase Nanoparticles as High-Performance Anode Materials for Na-Ion Batteries

Structural Study of Carbon-Coated TiO₂ Anatase Nanoparticles as High-Performance Anode Materials for Na-Ion Batteries

Formation of Fe–Fe Antiferromagnetic Dimers in Doped TiO₂:Fe Nanoparticles