Synthesis and characterization of Ti1−2xNbxNixO2−x/2 solid solutions

Martos, Mónica; Forés, Beatriz; Dehouli, Hakim; Gourier, Didier; Cordoncillo, Eloísa; Escribano, P.

doi:10.1016/j.jssc.2006.11.026

Cited by 12 publications

(6 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Among many methods, sol-gel synthesis is particularly promising for production of materials without the need of high-temperature calcination that influence the final properties of the product. [26,27] Concerning these structures, the present study is aimed to obtain cerium titanate compounds as alternative colouring materials to substitute the highly toxic lead, cadmium, chromium and nickel pigments, commonly used in the ceramic industry. This work stresses in the synthetic methodologies (sol-gel route) which allow to obtain mixed oxides with Ti(IV)/Ce(III), Ti(IV)/Ce(IV) or Ti(IV)/Ce(III)-Ce(IV) species.…”

Section: +mentioning

confidence: 99%

Sol–Gel Synthesis of Tunable Cerium Titanate Materials

et al. 2008

Self Cite

View full text Add to dashboard Cite

Cerium titanate structures present a high technological interest because of their optical and catalytic properties. This work reports the synthesis of these materials by a sol–gel methodology that allows mixed oxides with TiIV/CeIII, TiIV/CeIV or TiIV/CeIII–CeIV species to be obtained. Crystallization of CeO2–TiO2 mixed oxides and Ce2Ti2O7 pyrochlore phase was corroborated by XRD and Raman spectroscopy. Magnetic and EPR measurements were performed in order to clarify the oxidation state of the cerium ions in the system as a result of the easy oxidation of CeIII. The firing atmosphere is crucial for the CeIII/CeIV ratio, which is responsible for the different structure, but it also affects the colouration (yellow, green, brown). This methodology offers the possibility to modulate the Ce3+/Ce4+ content and particle sizes providing more ecological coloured pigments based on rare earth elements that could be interesting materials for advanced applications in catalysis.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)

show abstract

Section: +mentioning

confidence: 99%

Sol–Gel Synthesis of Tunable Cerium Titanate Materials

et al. 2008

Self Cite

View full text Add to dashboard Cite

show abstract

“…Deconvolution of the TO-Ni-02 spectrum into components (designated as TO-Ni-02* in Figure 6a), excluding the contribution of the low-intensity signal of Fe 3+ , showed that the broad signal (N1) was characterized by g = 2.19, and the narrow one (N2) was characterized by g = 2.003. The g-factor value for component N1 is typical of Ni 2+ ions in the octahedral crystal field [50,51]. Hence, it can be suggested that Ni 2+ ions substituted the Ti 4+ species in some octahedra within the TiO 2 (B) lattice.…”

Section: Resultsmentioning

confidence: 99%

Enhancing Lithium and Sodium Storage Properties of TiO2(B) Nanobelts by Doping with Nickel and Zinc

et al. 2021

View full text Add to dashboard Cite

Nickel- and zinc-doped TiO2(B) nanobelts were synthesized using a hydrothermal technique. It was found that the incorporation of 5 at.% Ni into bronze TiO2 expanded the unit cell by 4%. Furthermore, Ni dopant induced the 3d energy levels within TiO2(B) band structure and oxygen defects, narrowing the band gap from 3.28 eV (undoped) to 2.70 eV. Oppositely, Zn entered restrictedly into TiO2(B), but nonetheless, improves its electronic properties (Eg is narrowed to 3.21 eV). The conductivity of nickel- (2.24 × 10−8 S·cm−1) and zinc-containing (3.29 × 10−9 S·cm−1) TiO2(B) exceeds that of unmodified TiO2(B) (1.05 × 10−10 S·cm−1). When tested for electrochemical storage, nickel-doped mesoporous TiO2(B) nanobelts exhibited improved electrochemical performance. For lithium batteries, a reversible capacity of 173 mAh·g−1 was reached after 100 cycles at the current load of 50 mA·g−1, whereas, for unmodified and Zn-doped samples, around 140 and 151 mAh·g−1 was obtained. Moreover, Ni doping enhanced the rate capability of TiO2(B) nanobelts (104 mAh·g−1 at a current density of 1.8 A·g−1). In terms of sodium storage, nickel-doped TiO2(B) nanobelts exhibited improved cycling with a stabilized reversible capacity of 97 mAh·g−1 over 50 cycles at the current load of 35 mA·g−1.

show abstract

“…The most recent studies show that the addition of small quantities of Nb 2 O 5 into TiO 2 lattice significantly increases the photocatalytic activity and surface acidity of TiO 2 [46,47]. On the other hand, Fe(III) doped photocrystaline titania have also been widely studied in the field of photocatalysis [32,33,[48][49][50].…”

Section: Introductionmentioning

confidence: 99%