Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 8
·4445-4452
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IF 7.443
Bingkun Liu,Yanjun Sun,Xuesong Wang,Lijing Zhang,Dejun Wang,Zewen Fu,Yanhong Lin,Tengfeng Xie
We report novel hierarchical three-dimensional (3D) TiO2 nanotube-branched rutile TiO2 nanorod arrays (H-TiO2 NRAs) on FTO substrates that serve as model architecture for efficient quantum dot-sensitized solar cells (QDSCs). The newly designed H-TiO2 NRA photoanode offers a large surface area for high QD loading with high light scattering properties. In the meantime, the presence of anatase–rutile heterojunction at the interface helps the rutile nanorods to efficiently collect photo-injected electrons from the anatase nanotubes, reducing electron recombination with the electrolyte and QDs. As a result, the H-TiO2 NRA photoanode with a thickness of only 1 μm, exhibits a solar energy conversion efficiency of 1.04%, which is 2.7 times higher than that found in the pristine nanorod array-based QDSCs, demonstrating the synergistic effect of rutile nanorods and anatase nanotubes for photoelectrochemical solar energy conversion.
研究领域:
材料科学
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能源科学
·
纳米技术
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International Journal of Nanomedicine
·
2023
·
IF 8
Wenshu Cheng,Xinyue Xu,Yuanyuan Lang,Zugen Cheng,Mohammad Rizwan,Xiaomin Tang,Lixin Xie,Yanling Liu,Hengyi Xu,Yang Liu
Purpose To evaluate the effects of anatase and rutile TiO2 nanoparticles (NPs) on the growth and development of bones in young rats and explore their possible mechanisms.Methods Three-week-old male rats were orally administered anatase TiO2 NPs and rutile TiO2 NPs for 28 days. The indicators of rat growth and development, liver function, bone metabolism, and insulin-like growth factor-1 (IGF-1) levels were evaluated. Micro-computed tomography (micro-CT) and immunohistochemistry were used to evaluate the tibia.Results No significant differences were observed among growth and development indicators in young rats. Significant differences were found in IGF-1 levels, phosphorus levels, and liver function. Micro-CT revealed osteoporosis in the bones. The micro-CT data supported the same result. Bone immunohistochemistry results showed that the expression of osteoprotegerin (OPG) was decreased and the expression of receptor activator of nuclear factor-κB ligand (RANKL) and cathepsin K (CTSK) was increased.Conclusion This study demonstrated that TiO2 NPs can damage bones via the IGF-1/OPG/RANKL/CTSK pathway in young rats. Furthermore, rutile TiO2 NPs damaged the bones more seriously than anatase TiO2 NPs.
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Colloid and Interface Science Communications
·
2023
·
IF 4.5
Shihui Jiao,Mingyu Shang,Yan Chen,Guangsheng Pang
The in situ anchoring of metal elements on the surface of nanomaterials is a state-of-the-art technology that can significantly enhance the performance of materials. We have successfully fabricated noble metal-ion modified rutile TiO 2 nanobars, which exhibit exceptional catalytic activity in both H 2 generation and CO oxidation. Firstly, we synthesized Ti 3+ self-doped rutile TiO 2-x nanobars by a simple solvothermal method using Zn as a reductant, resulting in highly crystalline structures with a significant proportion of (110) surfaces. The reduced nanobars chemically absorb the noble metal cations with the addition of a solution of a noble metal salt in the absence of light to form in situ noble metal-ion modified catalysts. TiO 2 nanobars with 1 wt% Pt 2+ and Pd 2+ exhibited excellent performance in photocatalytic H 2 generation from water and low temperature CO oxidation. Moreover, the samples modified with low noble metal ions (0.1 wt%) also show effective activity in H 2 generation.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yingguan Xiao,Jiajing Wu,Huiquan Li,Xiang Liu,Qian Li,Ying Zhang,Shunsheng Cao
Constructing phase junction is an effective strategy to increase photocatalytic performance of titanium dioxide (TiO 2 ) because it can promote charge separation. However, both low surface area and unstable phase interface limit its further application. In this investigation, we introduce a structural regulation strategy to prepare anatase/rutile TiO 2 (A/R–TiO 2 ) hollow photocatalyst through in-situ growth of rutile TiO 2 on anatase TiO 2 hollow microspheres byheat treatment. The as-synthesized A/R–TiO 2 photocatalyst was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and ultraviolet–visible (UV–vis) spectroscopy. The results reveal that the A/R–TiO 2 hollow photocatalyst significantly promotes efficient charge separation due to the intimate contact of two phases within a single hollow sphere. Notably, A/R–TiO 2 exhibits more efficient than commercial TiO 2 (P25) towards the photodegradation of various pesticide pollutants, which suggests that such a structural design can be an effective method for rationally constructing TiO 2 -based photocatalyst with advanced performance.
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MATERIALS CHEMISTRY AND PHYSICS
·
2016
·
IF 2.101
Dong Ri Zhang,Xuan Zhen Jin,Jing Hao Li
TiO 2 nanoparticles doped with 2.0 at.% Sc and 2.0 at.% V calcinated at temperatures of 500–800 °C were investigated by XRD technique. Results show that Sc doping promote the anatase-to-rutile phase transition compared to the pure TiO 2 , while V doping inhibit the anatase-to-rutile phase transition below 600 °C and then rapidly accelerated the anatase-to-rutile phase transition above 600 °C. However, the anatase-to-rutile phase transition is significantly inhibited by Sc V codoping until 750 °C. The M, И and Λ pattern evolutions of the average crystallite size of rutile with calcination temperature are found and two models are proposed for the findings.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
·
IF 9.446
Jun Xiao,Weiyi Yang,Qi Li
Bi quantum dots were deposited onto rutile TiO 2 nanoparticles by a one-pot, solvent-thermal process to create the Bi/TiO 2 (rutile) heterojunction photocatalyst. Due to the specific semimetal property of Bi, a metal to semiconductor transition occurred for Bi quantum dots, which endowed them with the hole trapping capability to enhance the charge carrier separation in rutile TiO 2 and eliminate the need of sacrificial agents for the consumption of photogenerated holes in photocatalytic reduction process. The Bi/TiO 2 (rutile) heterojunction photocatalyst demonstrated an efficient photocatalytic bromate reduction under visible light illumination without the addition of sacrificial agents in the reaction solution, and it could be easily regenerated for reuse. Different with previously reported noble/transition metal modifications as the electron trapping center, this study demonstrated a novel material design strategy of the introduction of hole trapping centers to create photocatalysts with strong photocatalytic reduction capabilities, which could be readily adopted for a broad range of technical applications.
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JOURNAL OF HAZARDOUS MATERIALS
·
2017
·
IF 6.065
Qilin Yu,Honggang Wang,Qi Peng,Ye Li,Zhe Liu,Mingchun Li
TiO 2 nanoparticles (NPs) are well-known nanomaterials (NMs), widely used in cosmetics, solar cells, photo-catalysts and additives. Anatase and rutile are the two main crystalline phases of TiO 2 NPs and have distinct electrical and optical properties. However, their relative toxicity to organisms is a current topic of debate. In this study, we synthesize both anatase NPs (TiO 2 -A) and rutile NPs (TiO 2 -R) with similar particle sizes (20–40 nm), surface areas (51–52 m 2 /g) and Zeta potentials (−13.4 to −13.7 mV), and investigate their toxicity to macrophages. Contrary to previous findings, TiO 2 -A show a lower percentage cell deaths compared to TiO 2 -R (10% vs 20% at 50 mg/L), indicating a lower toxicity compared to TiO 2 -R. The macrophages treated with TiO 2 -A and TiO 2 -R have similar levels of reactive oxygen species (ROS) and the autophagy marker LC3, implying that our observed difference in toxicity is not attributed to oxidative damage and autophagy. Interestingly, TiO 2 -A cause less severe necrosis and lysosomal membrane permeabilization (LMP), but more severe mitochondrial dysfunction. Adsorption assays further reveal that TiO 2 -A and TiO 2 -R have a higher affinity to proteins and phospholipids, respectively. This study demonstrates an important role of crystal phase-related surface affinity to different biomolecules in nanotoxicity.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Zhanshuai Li,Jinsheng Li,Huanyu Zhao,Mengwen Zhang,Pengfei Li,Liang Dong,Lei Wu,Haipeng Ji,Xiwei Qi
A new high-entropy oxide, (Ge 0.2 Mn 0.2 Ti 0.2 Sn 0.2 Mo 0.2 )O 2 with rutile structure, was successfully synthesized using solid-state reaction method. The phase structure of the ceramic samples prepared forming a range of binary to quinary phase with increasing entropy were investigated, and the effects of atmosphere-induction and high-entropy synergistic behavior on the dielectric performance were studied. As the type of the cations increases, the temperature required to form a single rutile structure gradually decreases, while the dielectric properties of the ceramics gradually improved. The dielectric constant of the (Ge 0.2 Mn 0.2 Ti 0.2 Sn 0.2 Mo 0.2 )O 2 high-entropy oxide ceramics sintered in the nitrogen atmosphere at 1350°C is nearly 20 times higher of the ceramics sintered in the air. This significant enhancement can be attributed to the occurrence of two rutile structures and the generation of excessive oxygen vacancies as a result of high-entropy synergistic behavior under the nitrogen sintering atmosphere.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2025
·
IF 14.3
Wenjiao Chang,Honghuo Wang,Tingting Wu,Shuting Zhang,Yifan Li,Junying Wang,Yongqiang Yang,Lei Wang
Photocatalytic CO 2 reduction reaction is regarded as a potential strategy to convert greenhouse gases into valuable chemicals. However, achieving photocatalysts with high efficiency and target product selectivity under visible light still faces great challenges. Herein, sub-2 nm RuO 2 @TiO 2 (RTO) nanorods with lattice matching interface are rationally designed and prepared via a hydrothermal reaction step-by-step. Due to the strong interaction of the lattice-matched interface with the Ru-O-Ti bond, new energy levels have emerged at the interface, leading to effective visible light absorbance. Moreover, the photo-generated electrons could be transferred to the RuO 2 efficiently via the lattice-matched interface. As a result, the RTO photocatalyst exhibits superior CO 2 -to-CH 4 conversion performance of 15.6 µmol g −1 with a selectivity of 87.9% under visible light irradiation. Density functional theory (DFT) calculation reveals that the energy barrier of CO* to CO is significantly higher than that of *CHO, resulting in the preferential production of CH 4 . This work provides an effective strategy for designing photocatalyst with promoted visible light absorption and improved product selectivity.
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Nanoscale Research Letters
·
2019
·Vol. 14
·期 1
·1-9
·
IF 3.159
Li Xiaoliang,Feng Jiangjiang,Sun Jia,Wang Zhe,Zhao Wei
TiO 2 (P25)-supported Au-Pd bimetal nanoparticles displayed excellent performance in the solvent-free benzyl alcohol catalytic oxidation. However, little research attention has been paid to investigate the effects of TiO 2 form on the catalytic activity of Au-Pd/TiO 2 . In the present research, rutile, brookite, and anatase TiO 2 were successfully synthesized and subsequently applied as the carrier to load Au-Pd nanoparticles by the deposition-precipitation method. The experimental results indicated that the benzyl alcohol conversion employing the rutile TiO 2 -supported Au-Pd catalyst is higher than the conversion of anatase and brookite TiO 2 -loaded Au-Pd catalysts. However, the Au-Pd/TiO 2 -rutile displayed the lowest and highest selectivity toward benzaldehyde and toluene, respectively. ICP-AES, XRD, XPS, and TEM were conducted to characterize these catalysts. The corresponding experimental results revealed that the excellent performance of Au-Pd/TiO 2 -rutile catalyst was attributed to both the smaller Au-Pd nanoparticle size distribution and the higher concentrations of O α and Pd 2+ species on the catalyst surface. In the recycle experiments, the Au-Pd/TiO 2 -rutile catalyst displayed lower reaction stability compared with the Au-Pd/TiO 2 -anatase and Au-Pd/TiO 2 -brookite, which might be due to the coverage of larger amount of aldehyde products on the surface.
研究领域:
化学
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材料科学
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JOURNAL OF POWER SOURCES
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2019
·
IF 7.467
Yuqing Xiao,Changlei Wang,Kiran Kumar Kondamareddy,Pei Liu,Fei Qi,Huijie Zhang,Shishang Guo,Xing-Zhong Zhao
Surface passivation of the electron transport layer in perovskite solar cells has been proven to be one crucial strategy to improve the power conversion efficiency . In this study, we introduce rutile phase titania shell to passivate anatase TiO 2 scaffold, forming anatase@rutile mixed-phase TiO 2 scaffold in hole-conductor-free carbon based perovskite solar cells . Anatase@rutile mixed phase TiO 2 films exhibit higher conductivity, faster charge extraction, lower trap density and suppressed charge recombination at the interface of TiO 2 /perovskite films in the modified devices as well, achieving a champion power conversion efficiency of 15.21% for carbon based perovskite solar cells . More importantly, benefiting from the stable and better ultraviolet light filtration properties of rutile phase TiO 2 , our devices exhibit excellent stability maintaining 92% of their initial efficiency after 200 days storage in ambient air, highlighting their merits as a potential competitor for future industrial photovoltaics .
研究领域:
材料科学
·
能源技术
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Materials
·
2022
·Vol. 15
·期 23
·8310
·
IF 3.748
Qianfang Zheng,Shanxia Xiong,Xiaowei Wu,Jianlei Kuang,Wenxiu Liu,Wenbin Cao
Infrared thermal reflective coating is an effective material to reduce building energy consumption and carbon emission. In this work, needle-shaped-rutile-shell-coated hollow glass microbeads (HGM) were prepared by surface modification of HGM and thermohydrolysis of TiCl4, and the possible shell formation mechanism was also proposed. The near infrared (NIR) reflectance of the coated HGM reached 93.3%, which could be further increased to 97.3% after the rutile shell crystallinity was improved by heat treatment. Furthermore, HGM/styrene–acrylic composite reflective coating was prepared on the surface of gypsum board by facile blending and coating methods, and the thermal insulation performance was measured by an indigenously designed experimental heat set-up. The results show that the composite coating prepared by HGM coated with rutile shell shows better NIR reflectance and thermal insulation performance than that prepared by pure organic coating and uncoated HGM. Meanwhile, it also shows better surface hydrophobicity, which is conducive to long-term and stable infrared reflection performance.Keywords:hollow glass microsphere;needle-shaped rutile;near infrared reflectance;thermal insulation coating;hydrophobic properties
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