Unraveling doping induced anatase–rutile phase transition in TiO<sub>2</sub> using electron, X-ray and gamma-ray as spectroscopic probes

Banerjee, Debashis; Gupta, Santosh K.; Patra, N.; Raja, Sk Wasim; Pathak, Nimai; Bhattacharyya, D.; Pujari, P. K.; Thakare, S. V.; Jha, S. N.

doi:10.1039/c8cp04310h

Cited by 15 publications

(8 citation statements)

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“…Furthermore, Raman analysis identified two additional low‐intensity bands at 273 and 701 cm −1 indicating trace amounts of rutile TiO 2 [45] . This could be credited to the Ti−O−Ti bond weakening associated with Co doping, which facilitated minor anatase‐to‐rutile transition [46] . Concentration of rutile phases is extremely low and cannot be detected with the XRD technique.…”

Section: Resultsmentioning

confidence: 99%

“…[45] This could be credited to the TiÀ OÀ Ti bond weakening associated with Co doping, which facilitated minor anatase-torutile transition. [46] Concentration of rutile phases is extremely low and cannot be detected with the XRD technique. However, intensities of these additional peaks are stronger for the Ti 0.89 Co 0.11 O 1.89 rather than other Ti 1-x Co x O 2-y nanosheets having lower and higher Co concentrations.…”

Section: Chemsuschemmentioning

confidence: 99%

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High‐Performance Mg−Li Hybrid Batteries Based on Pseudocapacitive Anatase Ti_1‐xCo_xO_2‐y Nanosheet Cathodes

et al. 2022

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Despite the proposed safety, performance, and cost advantages, practical implementation of MgÀ Li hybrid batteries is limited due to the unavailability of reliable cathodes compatible with the dual-ion system. Herein, a high-performance MgÀ Li dual ion battery based upon cobalt-doped TiO 2 cathode was developed. Extremely pseudocapacitance-type Ti 1-x Co x O 2-y nanosheets consist of an optimum 3.57 % Co-atoms. This defective cathode delivered exceptional pseudocapacitance (maximum of 93 %), specific capacities (386 mAh g À 1 at 25 mA g À 1 ), rate performance (191 mAh g À 1 at 1 A g À 1 ), cyclability (3000 cycles at 1 A g À 1 ), and coulombic efficiency ( � 100 %) and fast charging ( � 11 min). This performance was superior to the TiO 2 -based MgÀ Li dualion battery cathodes reported earlier. Mechanistic studies revealed dual-ion intercalation pseudocapacitance with negligible structural changes. Excellent electrochemical performance of the cation-doped TiO 2 cathode was credited to the rapid pseudocapacitance-type Mg/Li-ion diffusion through the disorder generated by lattice distortions and oxygen vacancies. Ultrathin nature, large surface area, 2D morphology, and mesoporosity also contributed as secondary factors facilitating superior electrode-electrolyte interfacial kinetics. The demonstrated method of pseudocapacitance-type MgÀ Li dual-ion intercalation by introducing lattice distortions/oxygen vacancies through selective doping can be utilized for the development of several other potential electrodes for high-performance MgÀ Li dual-ion batteries.

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Section: Resultsmentioning

confidence: 99%

Section: Chemsuschemmentioning

confidence: 99%

High‐Performance Mg−Li Hybrid Batteries Based on Pseudocapacitive Anatase Ti_1‐xCo_xO_2‐y Nanosheet Cathodes

et al. 2022

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“…The BT-8 contains 25.3 atomic % of Mn ion; thereby, six hyperfine transitions are observed (as evident from inset of Figure a). These hyperfine lines are superimposed with a g value of free electron resulting in a broad signal with g = 2.04 . Further, HR-TEM analysis was carried out to realize the formation of vacancy defect states.…”

Section: Resultsmentioning

confidence: 99%

“…These hyperfine lines are superimposed with a g value of free electron resulting in a broad signal with g = 2.04. 67 Further, HR-TEM analysis was carried out to realize the formation of vacancy defect states. Figure 4b shows the nanoparticles are in the size range of 5−8 nm; the inset of Figure 4b shows the point defect (V O ) formation, as evident from the vacancy associated distorted lattice.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Clean Water from Air Utilizing Black TiO₂-Based Photothermal Nanocomposite Sheets

Backer

Ramachandran

et al. 2020

ACS Appl. Nano Mater.

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Herein, we demonstrate a simple, highly efficient, and cost-effective clean water generation strategy that can be implemented in the geographical locations deprived of freshwater resources. We captured and purified the atmospheric water utilizing CaCl2 as a deliquescent material followed by solar thermal desalination with an engineered-photothermal nanocomposite sheet (E-PNS). The E-PNS was prepared using Mn2+ ion promoted oxygen vacancy (VO) rich black anatase TiO2 nanoparticles as filler and poly(vinylidene fluoride) as the polymer matrix. The developed E-PNS exhibits an excellent radiation absorption of ∼98.5% covering the entire solar spectrum (250–2500 nm) and has interconnected micropores that facilitate efficient solar–thermal heat and mass transfer. Hence, the reported clean water generation strategy achieves a high solar to thermal conversion efficiency of 90% under light irradiation (solar simulator, intensity 1.13 kW m–2), which is 2.2 times higher when compared to water itself. Further, real-time analysis of an E-PNS integrated all-in-one water from air generator prototype showed a clean water generation rate of 0.365 kg m–2 h–1, i.e., ∼2.2 L m–2 day–1, under direct solar irradiation (∼1.06 kW m–2), thereby offering a very promising technological solution for the production of clean water in water-scarce regions.

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“…Rutile is a thermodynamically stable phase and anatase will gradually transform into rutile with temperature rising. Therefore, anatase/rutile mixed crystal TiO 2 may be obtained within a certain temperature range [24,25]. The two-phase composition has an important influence on the photocatalytic property of anatase/rutile mixed crystal.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Sn/Ni Single Doped and Co–Doped Anatase/Rutile Mixed–Crystal Nanomaterials and Their Photocatalytic Performance under UV–Visible Light

et al. 2021

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Pure and Sn/Ni co–doped TiO2 nanomaterials with anatase/rutile mixed crystal were prepared and characterized. The results show that pure TiO2 is a mixed crystal structure composed of a large amount of anatase and a small amount of rutile. Sn doping promotes the phase transformation from anatase to rutile, while Ni doping inhibits the transformation. Both single doping and co–doping are beneficial to the inhibition of photoinduced charge recombination. Sn doping shows the best inhibitory effect on photogenerated charge recombination, and increases the utilization of visible light, displaying the highest photocatalytic activity. The decolorization degree of methylene blue (MB) by Sn–TiO2 is 79.5% after 150 min. The reaction rate constant of Sn–TiO2 is 0.01022 min−1, which is 5.6 times higher than pure TiO2 (0.00181 min–1).

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Unraveling doping induced anatase–rutile phase transition in TiO₂ using electron, X-ray and gamma-ray as spectroscopic probes

Abstract: The present work reports the microscopic details of anatase (A) to rutile (R) phase transformation in a Mn-doped TiO2 system.

Cited by 15 publications

References 47 publications

High‐Performance Mg−Li Hybrid Batteries Based on Pseudocapacitive Anatase Ti_1‐xCo_xO_2‐y Nanosheet Cathodes

High‐Performance Mg−Li Hybrid Batteries Based on Pseudocapacitive Anatase Ti_1‐xCo_xO_2‐y Nanosheet Cathodes

Clean Water from Air Utilizing Black TiO₂-Based Photothermal Nanocomposite Sheets

Synthesis and Characterization of Sn/Ni Single Doped and Co–Doped Anatase/Rutile Mixed–Crystal Nanomaterials and Their Photocatalytic Performance under UV–Visible Light

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Unraveling doping induced anatase–rutile phase transition in TiO2 using electron, X-ray and gamma-ray as spectroscopic probes

Abstract: The present work reports the microscopic details of anatase (A) to rutile (R) phase transformation in a Mn-doped TiO2 system.

Cited by 15 publications

References 47 publications

High‐Performance Mg−Li Hybrid Batteries Based on Pseudocapacitive Anatase Ti1‐xCoxO2‐y Nanosheet Cathodes

High‐Performance Mg−Li Hybrid Batteries Based on Pseudocapacitive Anatase Ti1‐xCoxO2‐y Nanosheet Cathodes

Clean Water from Air Utilizing Black TiO2-Based Photothermal Nanocomposite Sheets

Synthesis and Characterization of Sn/Ni Single Doped and Co–Doped Anatase/Rutile Mixed–Crystal Nanomaterials and Their Photocatalytic Performance under UV–Visible Light

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Resources

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Unraveling doping induced anatase–rutile phase transition in TiO₂ using electron, X-ray and gamma-ray as spectroscopic probes

High‐Performance Mg−Li Hybrid Batteries Based on Pseudocapacitive Anatase Ti_1‐xCo_xO_2‐y Nanosheet Cathodes

High‐Performance Mg−Li Hybrid Batteries Based on Pseudocapacitive Anatase Ti_1‐xCo_xO_2‐y Nanosheet Cathodes

Clean Water from Air Utilizing Black TiO₂-Based Photothermal Nanocomposite Sheets