JOURNAL OF HAZARDOUS MATERIALS
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2016
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IF 4.836
Wen-Yuan Yan,Qi Zhou,Xing Chen,Yong Yang,Yong Zhang,Xing-Jiu Huang,Yu-Cheng Wu
Photocatalytic degradation is one of the most promising methods for removal of fulvic acids (FA), which is a typical category of natural organic contamination in groundwater. In this paper, TiO 2 /graphene nanocomposites (N-RGO/TiO 2 ) were prepared via simple chemical functionalization and one-step hydrothermal method for efficient photodegradation of FA under illumination of a xenon lamp as light source. Here, p -phenylenediamine was used as not only the linkage chemical agent between TiO 2 nanocrystals and graphene, but also the nitrogen dopant for TiO 2 nanocrystals and graphene. During the hydrothermal process, facets of TiO 2 nanocrystals were modulated with addition of HF, and sizes of TiO 2 nanocrystals were controlled by the contents of graphene oxide functionalized with p -phenylenediamine (RGO-NH 2 ). The obtained N-RGO/TiO 2 nanocomposites exhibited a much higher photocatalytic activity and stability for degradation of methyl blue (MB) and FA compared with other TiO 2 samples under xenon lamp irradiation. For the third cycle, the 10wt%N-RGO/TiO 2 catalyst maintains high photoactivity (87%) for the degradation of FA, which is much better than the TiO 2 -N/F (61%) in 3 h. This approach supplies a new strategy to design and synthesize metal oxide and graphene oxide nanocomposites with highly efficient photocatalytic performance.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
Scientific Reports
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2014
·Vol. 4
·期 1
·1-7
·
IF 5.078
Xin Ling,Liu Yong,Li Baojun,Zhou Xiang,Shen Hui,Zhao Wenxia,Liang Chaolun
Here, we report a facile hydrothermal approach for synthesizing anatase TiO 2 hierarchical mesoporous submicrotubes (ATHMSs) with the aid of long-chain polymer as soft template. The TiO 2 nanocrystals, with sizes of 6–8 nm, are well interconnected with each other to build tubular architectures with diameters of 0.3–1.5 μm and lengths of 10–25 μm. Such highly porous structures give rise to very large specific surface area of 201.9 m 2 g −1 and 136.8 m 2 g −1 for the as-prepared and annealed samples, respectively. By using structurally stable ATHMSs as anode materials for lithium-ion batteries, they exhibited high reversible capacity, long cycling life and excellent cycling stability. Even after 1000 cycles, such ATHMS electrodes retained a reversible discharge capacity as high as 150 mAh g −1 at the current density of 1700 mA g −1 , maintaining 92% of the initial discharge capacity (163 mAh g −1 ).
研究领域:
材料科学
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能源技术
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DOI
PubMed
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2022
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IF 4.644
Zhun Zhou,Xiaozhong Li,Jinjun Li,Zhixiong You
In the present study, CO 2 methanation with Ru nanoparticles loaded onto three TiO 2 nanocrystal supports (TiO 2 anatase with both exposed (001) facets and oxygen vacancies , TiO 2 anatase with exposed (001) facets and general TiO 2 anatase) was demonstrated. The three samples were denoted as Ar700-R, 700-R and Ana-R, respectively. XRD results confirmed that Ar700-R and 700-R sample exposed (001) facets, XPS and EPR results demonstrated the presence of oxygen vacancies on the surface of Ar700-R. In tests of CO 2 methanation activity, Ar700-R showed the highest CO 2 conversion efficiency of 75% and CH 4 formation rate of 18.84 μmol•g −1 •s −1 (GHSV = was 21600 ml•h −1 •g −1 ) at 400 °C. The enhanced CO 2 methanation activity of Ar700-R was attributed to the co-activity achieved by exposing (001) facets and oxygen vacancies on the surfaces of TiO 2 nanocrystal supports.
研究领域:
化学工程
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材料科学
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Chenzheng Hua,Guangzhong Yuan,Ziqiang Cheng,Hong Jiang,Gang Xu,Yong Liu,Gaorong Han
TiO 2 nanocrystals embedded amorphous WO 3 electrochromic films have been successfully fabricated with a facile one-step solution process. The structure and electrochromic properties of composite films were studied by transmission electron microscope, scanning electron microscope, X-ray diffraction, Raman spectroscopy, and electrochemical methods. The results show that anatase TiO 2 nanocrystals with a size of about 5–10 nm were homogeneously embedded in the amorphous WO 3 matrix (TiO 2 @WO 3 ). Compared with pure WO 3 film, the electrochromic performances of TiO 2 @WO 3 are evidently enhanced. The further electrochemical analysis indicates that the enhancement may be mainly ascribed to the reconstruction of amorphous WO 3 matrix with the emerging interfaces between nanocrystals and amorphous matrix. And the extremely high value of the coloration/bleaching reversibility is associated with the suppressing effect of TiO 2 nanocrystals upon the Li + trapping in WO 3 matrix.
研究领域:
材料科学
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电化学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2016
·Vol. 27
·期 12
·13161-13170
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IF 1.798
Qin Tianxiu,Zhang Shuxia,Chen Pei,Zhao Fengqi,Gao Hongxu,Chen Xinbing,An Zhongwei
TiO 2 nanocrystals are inserted in the pores of monodispersed mesoporous SiO 2 nanospheres with 20–35 nm diameter by a facile two-step method involving vacuum-rotary evaporation and subsequent calcination. Characterization by XRD, TEM, EDX, FT-IR and N 2 sorption techniques suggests that, the pores of the mesoporous SiO 2 nanosphere can effectively stabilize the anatase phase of TiO 2 nanocrystals with size about 6 nm even at high temperature of 750 °C. The photocatalytic activities of the samples with different TiO 2 loading amount were evaluated by the degradation of Rhodamine B dye in aqueous solution under UV-light irradiation. It is found that photocatalytic efficiencies of these materials are much better than commercial P25. Where the sample with TiO 2 loading of 43 % exhibits the highest photocatalytic efficiencies with complete degradation of Rhodamine B within 32 min, which is attributed to the balance between high surface area and suitable TiO 2 loading amount.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2022
·Vol. 169
·期 12
·126505
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IF 4.386
Yaqi Liu,Kaidong Zhan,Zhili Shi,Wenjing Lv,Pujia Cheng,Xuecheng Ren,Fan Wu
CuO nanoarrays were synthesized by using a hydrothermal method, and TiO2 nanocrystals were deposited on the surface of CuO nanoarrays to form bulk heterostructure photoelectrodes. The current-time curve revealed that TiO2 nanocrystals can enhance the photocurrent of CuO nanoarrays, resulting from the higher charge separation efficiency and transfer rate. In addition, the effects of small biases (–0.1 and 0.1 V) on the photocurrent and photogenerated charge dynamics in the aforementioned photoelectrodes were evaluated. A small bias was found to not influence the macroscopic dynamical process during charging and discharging of the CuO photoelectrode, but it was more correlated with the microscopic dynamics. Additionally, the built-in electric field in the CuO nanoarray/TiO2 heterojunction could be affected by a small external bias, thereby influencing the charge separation and charge diffusion concentration, which, subsequently, influenced the charge diffusion length, L. In contrast, L in the pristine CuO nanoarray was not improved under a small reverse bias, because the small reverse bias could not efficiently improve the diffusion concentration owing to the lack of a built-in electric field to dissociate electron-hole pairs. These kinetic mechanisms are helpful in understanding the photoelectric conversion process in heterogeneous photoelectrodes.
研究领域:
材料科学
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物理化学
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DOI
高影响因子
RSC Advances
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2014
·Vol. 4
·期 63
·33408-33415
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IF 3.708
Fang Cui,Linxu Xu,Tieyu Cui,Tongjie Yao,Jing Yu,Xiao Zhang,Kening Sun
In this paper, we demonstrate a facile and scalable route to the preparation of composites containing ultrasmall TiO2 nanocrystals and porous carbon matrix. In this method, the titanium ions are covalently introduced to polymer chains and transformed into TiO2 nanocrystals directly in solid matrices, which allows the generation of well dispersed TiO2 nanocrystals with small size in the entire carbon matrix. To our knowledge, this is the first time that ultrasmall TiO2 nanocrystals are incorporated into a bulk porous carbon matrix. In comparison with pure TiO2 particles, the composites exhibit significant improvement in photocatalytic degradation of methyl blue under visible light irradiation, which might be attributed to the ultrasmall size of TiO2 nanocrystals as well as the high separation efficiency of photogenerated electrons and holes based on the synergistic effect between TiO2 nanocrystals and carbon matrices. Furthermore, the composites could be easily recycled without obvious activity loss.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
LUMINESCENCE
·
2014
·Vol. 30
·期 1
·98-101
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IF 1.675
Xuan Liu,Nianyue Wang,Wei Zhao,Hui Jiang
This work reports for the first time a potential-based nano-electrochemiluminescent (ECL) pH sensor, using anatase TiO 2 nanocrystals (NCs) as the ECL probe. The first ECL peak potential of the TiO 2 NCs shifted negatively with increasing pH, showing a linear range from −0.47 V (vs Ag/AgCl) at pH 3 to −1.06 V at pH 10. This phenomenon was attributed to the absorption of ‘potential-determining ions’ of OH − on the surface of TiO 2 NCs, leading to larger impedance of the electron injection. Other common ‘potential-determining ions’, such as phosphate, induced a slight potential shift of 0.03 V at a concentration of 0.1 M. Using urease as an enzyme model, a urea biosensor was developed by the simultaneous modification of urease and TiO 2 NCs on indium–tin oxide (ITO) electrodes. The biosensor, measured on the basis of the pH increase caused by the enzyme catalysis reaction, had a linear range of 0.01–2.0 mM, with a potential shift of 0.175 V. The as-prepared pH sensor, which has simple construction procedures and acceptable sensitivity and selectivity, may provide new avenues for the construction of ECL bioanalytical methodologies. Copyright © 2014 John Wiley & Sons, Ltd.
研究领域:
分析化学
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生物传感技术
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PubMed
高影响因子
ACS Applied Materials & Interfaces
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2016
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IF 7.145
Ruifeng Tong,Chang Liu,Zhenkai Xu,Qin Kuang,Zhaoxiong Xie,Lansun Zheng
Integrating wide bandgap semiconductor photocatalysts with visible-light-active inorganic nanoparticles (such as Au and CdS) as sensitizers is one of the most efficient methods to improve their photocatalytic activity in the visible light region. However, as for all such composite photocatalysts, a rational design and precise control over their architecture is often required to achieve optimal performance. Herein, a new TiO2-based ternary composite photocatalyst with superior visible light activity was designed and synthesized. In this composite photocatalyst, the location of the visible light sensitizers was engineered according to the intrinsic facet-induced effect of well-faceted TiO2 nanocrystals on the spatial separation of photogenerated carriers. Experimentally, core–shell structured Au@CdS nanoparticles acting as visible light sensitizers were selectively deposited onto photoreductive {101} facets of well-faceted anatase TiO2 nanocrystals through a two-step in situ photodeposition route. Because the combination of Au@CdS and specific {101} facets of TiO2 nanocrystals facilitates the transport of charges photogenerated under visible light irradiation, this well-designed ternary composite photocatalyst exhibited superior activity in visible-light-driven photocatalytic H2 evolution, as expected.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 8
·9795-9803
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IF 2.478
Wei Song,Miao Juhong,Shi Qiuwei,Shao Shaofeng,Zhang Lei
In order to obtain improvement in efficiency and stability of quantum dot light-emitting diodes (QLEDs), it is essential to seek carrier transport layer with higher carrier transport efficiency and better air stability. In terms of the high-performance carrier transport layer, solution-processed inorganic metal oxides show promise for efficient QLEDs because of their suitable energy band, high carrier mobility, especially their outstanding air stability. In this study, we employed high-quality oleic acid-capped TiO 2 nanocrystals as the electron transportation layer to fabricate air-stable inverted QLEDs. These TiO 2 nanocrystals have narrow size distribution, outstanding crystalline property, especially excellent air stability. To improve the interfacial carrier transportation performance of oleic acid-capped TiO 2 nanocrystals, we introduce a thionyl chloride (SOCl 2 ) post-ligand exchange process that replaces organic long-chain ligands with single inorganic ligands efficiently. The stability of oleic acid-capped TiO 2 -based QLEDs were evaluated by comparing with the traditional ZnO-based QLEDs. As a result, oleic acid-capped TiO 2 nanoparticles show excellent long-term air stability. This study offers an alternative strategy to deal with the stability issue of optoelectronic devices.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 108
·88973-88978
·
IF 3.84
Di Li,Yanli Chen,Peng Du,Zhao Zhao,Haifeng Zhao,Yuejia Ma,Zaicheng Sun
Anatase TiO2 film, which is traditionally fabricated by high-temperature annealing of TiOx precursors, has been widely used as an electron collection layer in photovoltaics. In order to avoid the undesired high temperature treatment, in this work, we developed a convenient and moderate procedure to fabricate anatase TiO2 nanocrystal films at room temperature. Ultrafine, clean and high-quality anatase TiO2 nanocrystals have been pre-prepared in a simple solvothermal route and subsequent spin-coating of the nanocrystal dispersion provides a well formed TiO2 nanocrystal film without any further thermal treatment. The characteristics of the TiO2 nanocrystal film, in terms of crystallization phase, film morphology, optical and electronic properties, have been carefully studied, and then a typical [ITO/TiO2/P3HT:PCBM/MoO3/Ag] inverted photovoltaic device using TiO2 nanocrystals as the ECL has been fabricated and exhibits a comparable power conversion efficiency (PCE) of 3.35% to that of the conventional device (3.39% PCE).
研究领域:
材料科学
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能源技术
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光电化学
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
W.W. Yan,Y.F. Yuan,J.Y. Xiang,Y. Wu,T.Y. Zhang,S.M. Yin,S.Y. Guo
Triple-layered sandwich nanotubes of carbon@mesoporous TiO 2 nanocrystalline@carbon were prepared through coating hydrous titania and resorcinol-formaldehyde resin on carbon nanotubes followed by controllable crystallization and carbonization . Material characterization indicated that TiO 2 nanocrystalline with the size of 5–6 nm was uniformly assembled to the mesoporous sandwich layer of carbon nanotube-in-nanotube, leading to large specific surface area of 465.4 m 2 g −1 and large pore volume of 0.695 ml g −1 . As anode material for lithium ion batteries , triple-layered sandwich nanotubes exhibited high lithium storage capacity (244 mAh g −1 at 0.1C), good rate capability (115 mAh g −1 at 5C), and excellent cycling stability (191 mAh g −1 with coulombic efficiency of 100.2% was retained after 200 cycles at 0.2C, presenting 79% of capacity retention ratio). The superior lithium storage properties should be attributed to synergistic superiorities of TiO 2 nanocrystalline, the mesoporous sandwich layer structure and carbon nanotube-in-nanotube. These unique structural characteristics effectively reduce Li + diffusion length; enhances intercalation storage capability and pseudocapacitive interfacial storage capability of TiO 2 ; provides sufficient space to accommodate volume variation of TiO 2 nanocrystalline; increases electron conductivity and structure stability of TiO 2 . It is anticipated that the present triple-layered sandwich nanotube provides a unique carbon-based hybrid structure for other energy storage materials.
研究领域:
材料科学
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纳米技术
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能源存储
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DOI
高影响因子
危险品化学品经营许可证（带存储）