Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 9
·5720-5729
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IF 12.732
Shoujie Guan,Qinglu Fan,Zhichuan Shen,Yuling Zhao,Yang Sun,Zhicong Shi
Anatase TiO2 is considered as a promising anode material for sodium-ion batteries, but the inherent semiconductor properties and the sluggish Na+ diffusion kinetics limit its further development. To overcome these inherent drawbacks, heterojunction TiO2@TiOF2 constructed with two-dimensional nanosheets is prepared by the hydrothermal method. When heterojunction TiO2@TiOF2 is used as a sodium ion battery material, a stable cycling performance of up to 10 000 cycles can be achieved at a high current density of 5000 mA g−1, probably due to the heterojunction structure, the exposed (0 0 1) facet of TiO2 and the in situ formed NaF protective layer. Density functional theory (DFT) calculations further reveal that the heterostructure TiO2@TiOF2 nanosheets possess better electrical conductivity and lower formation energies of Na+ ions than those of the separated TiO2 and TiOF2. This work offers a new strategy to design novel heterojunction structures for the electrochemical sodium storage.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2016
·
IF 2.435
Xixia Zhao,Guijuan Wei,Junxue Liu,Zhaojie Wang,Changhua An,Jun Zhang
TiO 2 /TiOF 2 heterostructured nanocomposites has been synthesized through a solvothermal method and characterized by X-ray diffraction, scanning electronic microscopy, transmission electronic microscopy, nitrogen adsorption–desorption isotherms, UV–vis and photo-luminescent spectroscopy. It was found that, compared with single TiOF 2 or TiO 2 , the as-prepared TiO 2 /TiOF 2 nanocomposites exhibited superior photoactivity towards the degradation of organic pollutants, i.e . rhodamine B and solar hydrogen evolution. The results are in accordance with the prohibition of photogenerated electrons and holes recombination in these two samples under light illumination. The photocatalytic activity can be further boosted by introducing Pd nanoparticles onto the surfaces of TiO 2 /TiOF 2 through a simple deposition method without using any stabilizers, which is probably attributed to the enhanced visible-light absorption as well as the facilitated charge-carrier separation after the introduction of Pd nanoparticles. The synergistic effect between TiOF 2 and TiO 2 was discussed and was responsible for the enhancement of their activity in comparison with single counterpart.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 25
·14957-14969
·
IF 3.361
Chentao Hou,Huayang Liu,Yijie Li
A kind of high-efficiency photocatalyst of the three-dimensional flower-like TiO2/TiOF2 was synthesized by a one-step hydrothermal method. XRD, FE-SEM, EDS, HTEM, BET, XPS, PL, and UV-Vis-DRS were utilized to characterize the photocatalyst. The photocatalyst of TiO2/TiOF2 shows a narrow band gap of 2.8 eV. The generation of Ti3+ and an oxygen vacancy (Ov) in the photocatalyst are helpful to increase the absorption of visible light, and to inhibit faster charge recombination by capturing photogenerated carriers. Through the degradation of tetracycline hydrochloride (TCH) under simulated sunlight, the photocatalytic activity and stability of the synthesized samples were investigated. The results showed that the removal rate of tetracycline hydrochloride was 59% only in 0.5 h of dark reaction and 85% in 0.5 h of simulated sunlight. The removal efficiency of the photocatalyst for the adsorption and photocatalytic degradation of TCH is higher than that of the single TiO2, TiOF2, and Degussa P25. The synthesized three-dimensional flower-like TiO2/TiOF2 has great application potential in the treatment of antibiotic wastewater.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 70
·42860-42873
·
IF 3.119
Yue Jian,Huayang Liu,Jiaming Zhu,Yaqiong Zeng,Zuohua Liu,Chentao Hou,Shihua Pu
The anatase type cluster TiO2-{001/101} was rapidly generated by a one-step hydrothermal method. The transformation process of coral-like TiOF2 nanoparticles to cluster TiO2-{001/101} was investigated for the first time, and the sensitization between cluster TiO2-{001/101} and tetracycline hydrochloride (TCH) was also discussed. The degradation rate of TCH by cluster TiO2-{001/101} under simulated sunlight was 92.3%, and the total removal rate was 1.76 times that of P25. Besides, cluster TiO2-{001/101} settles more easily than P25 in deionized water. The study showed that cluster TiO2-{001/101} derived from coral-like TiOF2 nanoparticles had a strong adsorption effect on TCH, which was attributed to the oxygen vacancy (Ov) and {001} facets of cluster TiO2-{001/101}. The strong adsorption effect promoted the sensitization between cluster TiO2-{001/101} and TCH, and widened the visible light absorption range of cluster TiO2-{001/101}. In addition, the fluorescence emission spectrum showed that cluster TiO2-{001/101} had a lower luminous intensity, which was attributed to the heterojunction formed by {001} facets and {101} facets that reduces the recombination rate of carriers. It should be noted that cluster TiO2-{001/101} still has good degradation performance for TCH after five cycles of degradation. This study provides a new idea for the synthesis of cluster TiO2-{001/101} with high photocatalytic performance for the treatment of TCH wastewater.
研究领域:
材料科学
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环境科学
·
光催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2025
·
IF 4.6
Wenyu Li,Yajun Wang,Qiang Gan,Zhengliang Deng,Junhan Gao
Developing efficient oxidizers is critical for advancing nano thermites. Titanium oxyfluoride (TiOF 2 ) with oxygen/fluorine dual-active centers is innovatively employed as an oxidizer in Al/TiOF 2 composites prepared via physical mixing. Structural and morphology characterization confirms uniform interfacial contact while preserving component stability. The system demonstrates exceptional reactivity: onset and peak reaction temperatures (409.4°C, 470.0°C) are reduced by 139.1°C and 130.7°C, respectively, versus Al/TiO 2 , with activation energy lowered to 84.35 kJ·mol −1 . Synergistic F–O interactions impair reaction barriers, yielding 3692.2J·g −1 heat release (120 % increase over Al/TiO 2 ). Combustion tests reveal vigorous ignition under low energy input, rapid flame propagation, and two-stage spark ejection. This work reveals the activation mechanism of oxyfluoride as an oxidizer for thermites: fluorine enhances the reaction kinetics through an interfacial modification effect, while oxygen guarantees the energy density of the system. The synergy of the two elements realizes the optimization and regulation of combustion performance.
研究领域:
材料科学
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化学工程
·
含能材料
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纳米技术
·
燃烧化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Zhenguo Wang,Ke Yu,Yu Feng,Ruijuan Qi,Jie Ren,Ziqiang Zhu
MXenes, a new class of two-dimensional materials, possessing high electrical conductivity and unique surface properties，have exhibited great potential as non-noble metal catalyst for hydrogen evolution reaction (HER). However, due to poor oxidation resistance , they are easily oxidized in aqueous solution and high humidity environment, resulting in a great loss of electronic properties and surface reactivity. Herein, we report a simple and effective composite synthesis strategy with TiOF 2 intercalation to improve the stability of MXenes materials. TiOF 2 @Ti 3 C 2 T x prepared by this strategy shows ultra-long catalytic activity life of 1000 cycles in acid electrolyte. Besides，the catalyst also shows high HER activity with a low onset potential of 103 mV and a Tafel slope as low as 56.2 mV dec − 1 . Benefiting from the stabilization of TiOF 2 and the physicochemical properties of Ti 3 C 2 T x , TiOF 2 @Ti 3 C 2 T x also exhibits excellent humidity sensitivity and stability.
研究领域:
材料科学
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化学工程
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Yuanyuan Chen,Xilun Wang,Ziruo Zeng,Meiru Lv,Kangfu Wang,Hao Wang,Xiaoning Tang
TiO 2 /TiOF 2 Z-scheme nanosheets have been successfully synthesized for photocatalytic antibacterial. The antibacterial efficiency of TiO 2 /TiOF 2 against E. coli and S. aureus were 99.90 % and 81.89 % at low material concentration (110 μg/mL), respectively, which are higher than those of pure TiO 2 , TiOF 2 , and Degussa P25. In situ molecular spectroscopy results demonstrate that the microstructure of the synthesized material can be reconstructed and optimized to enhance the exposure of the active sites·H 2 O and O 2 are effectively adsorbed on the catalyst surface and activated to form OH…Ti and O…Ti surface active species. Furthermore, the dense interface formed in TiO 2 /TiOF 2 acts as an efficient transport path for photoexcited electrons from TiO 2 to TiOF 2 , and thus accelerates the formation of reactive oxygen species . Finally, the mechanism of bacterial inactivation is systematically discussed considering the main active substances, cell morphological changes, and activity of antioxidant enzymes.
研究领域:
材料科学
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纳米技术
·
催化
·
光化学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 56
·35215-35227
·
IF 3.361
Yue Jian,Huayang Liu,Jiaming Zhu,Yaqiong Zeng,Zuohua Liu,Chentao Hou,Shihua Pu
Photocatalytic degradation is an eco-friendly and sustainable method for the treatment of water pollutants especially tetracycline hydrochloride (TCH). Herein, we developed F-doped H2Ti3O7-{104} nanorods with oxygen vacancies using TiOF2 as a precursor by simple alkali hydrothermal and ion-exchange methods. The phase structure, surface composition, optical properties, specific surface areas and charge separation were analysed by a series of measurements. The effects of KOH concentration on the structure and properties of H2Ti3O7 were investigated. It is confirmed that the TiOF2/H2Ti3O7 composite can be formed in low concentration KOH solution (1 mol L−1), while the H2Ti3O7 single phase can be formed in high concentration KOH solution (>3 mol L−1). The prepared F-doped H2Ti3O7-{104} nanorods provide a high specific surface area of 457 m2 g−1 and a macroporous volume of 0.69 cm3 g−1. The appropriate mesoporous structure of the photocatalyst makes TCH have a stronger affinity on its surface, which is more conducive to the subsequent photodegradation. Moreover, a synergistic mechanism of photosensitization and ligand–metal charge transfer (LMCT) in the photocatalytic degradation of TCH was proposed. In addition, the prepared F-doped H2Ti3O7-{104} nanorods showed excellent cycle stability and resistance to light corrosion. After five cycles of photodegradation, the degradation rate of TCH was only reduced from 92% to 83%. This low-cost strategy could be used for the mass production of efficient photocatalysts, which can be used for TCH clean-up in wastewater treatment.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）