BIOSENSORS & BIOELECTRONICS
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2013
·
IF 5.437
Kai Yan,Rui Wang,Jingdong Zhang
A novel photoelectrochemical (PEC) biosensing platform was constructed by assembling CdSe quantum dots (QDs) and DNA on liquid phase deposited TiO 2 (DNA–CdSe/TiO 2 ) film electrode. The transmission electron microscopy (TEM), scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis indicated that CdSe QDs were homogeneously assembled on TiO 2 film. The UV–visible diffuse reflectance spectra (DRS) showed that CdSe and DNA could effectively enhance the absorption of TiO 2 film to visible light. The obtained electrode showed a sensitive PEC response to o -aminophenol (OAP) under visible light irradiation . Due to the interaction between DNA and OAP, the response of OAP was improved by DNA immobilized on the sensing film. Under optimized conditions, the photocurrent was linearly proportional to OAP in the concentration range from 4.0×10 −7 to 2.7×10 −5 mol L −1 , with a detection limit (3 S/N) of 8.0×10 −8 mol L −1 . The novel strategy could provide a fast and sensitive method for OAP determination.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2018
·
IF 6.735
Keliang Wu,Pengcheng Wu,Junfang Zhu,Chang Liu,Xuejun Dong,Jianning Wu,Guihua Meng,Kangbo Xu,Juan Hou,Zhiyong Liu,Xuhong Guo
During the photocatalytic production of hydrogen gas, close interface with a catalyst is very important. We designed a noble-metal-free photocatalytic system that is spatially separated to produce hydrogen by high frequency visible light. We used a new type of a catalyst consisting of hollow core-shell CdS@TiO 2 /Ni 2 P structures prepared using sacrificial template method. Photocatalytic decomposition of water was tested using this catalyst. Hydrogen production yield using 420 nm light was 14.80 mmol/g after 2.5 h and using Xe lamp with AM1.5G filter was 34.78 mmol/g after 2.5 h. Hollow core shell CdS@TiO 2 /Ni 2 P particles were more stable than hollow core shell CdS@TiO 2 /Pt structures because TiO 2 protected CdS from photo-corrosion. Combination of CdS and Ni 2 P increased absorption range of TiO 2 at 720 nm. Holes and electrons produced during the photo-reaction can migrate to the CdS on the inside and to the Ni 2 P on the outside of the TiO 2 protective coating. Such design exposes more surface, thus, increases hydrogen production.
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高影响因子
SOLAR ENERGY
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2017
·
IF 4.018
Liang Chu,Wei Liu,Aiai Yu,Zhengfei Qin,Ruiyuan Hu,Huazhong Shu,Qiu-Ping Luo,Yonggang Min,Jianping Yang,Xing'ao Li
TiO 2 modification via TiCl 4 treatment has been widely used to improve the power conversion efficiency (PCE) of dye-sensitized solar cells (DSSCs), in which the effects usually attribute to the inhibition of charge recombination by barrier effect. Niobium pentoxide (Nb 2 O 5 ) is considered a promising photoelectrode material for DSSCs. Here we prepared urchin-like orthorhombic Nb 2 O 5 nanospheres consisting of ultrathin nanorods by a hydrothermal method , which were further developed as photoelectrodes for DSSCs. The TiO 2 modification on the urchin-like orthorhombic Nb 2 O 5 nanospheres increases the photocurrent and PCE of the DSSCs. However, the impedance spectroscopy showed that charge recombination was not reduced by the TiO 2 modification. The improvement in the photocurrent and PCE has been attributed to the enhanced absorption of dye molecules (N719). The results indicate that the enhancement of dye absorption for orthorhombic Nb 2 O 5 photoelectrodes is the desirable approach to improve the performance of orthorhombic Nb 2 O 5 -based DSSCs.
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高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Jiangtao Zhao,Peng Zhang,Jiajie Fan,Junhua Hu,Guosheng Shao
Advanced materials for photoelectrochemical H 2 production are important to the field of renewable energy. Despite great efforts have been made, the present challenge in materials science is to explore highly active photocatalysts for splitting of water at low cost. In this work, we report a new composite material consisting of 2D layered MoS 2 nanosheets grown on the presence of TiO 2 /WO 3 nanofibers (TW) as a high-performance photocatalyst for H 2 evolution. This composite material was prepared by a two-step simple process of electrospinning and hydrothermal. We found that the as-prepared TiO 2 /WO 3 @MoS 2 (TWM) hybrid exhibited superior photocatalytic activity in the hydrogen evolution reaction (HER) even without the noble metal-cocatalyst. Importantly, the TiO 2 /WO 3 @MoS 2 heterostructure with 60 wt% of MoS 2 exhibits the highest hydrogen production rate. This great improvement is attributed to the positive synergetic effect between the WO 3 and MoS 2 components in this hybrid cocatalyst, which serve as hole collector and electron collector, respectively. Moreover, the effective charge separation was directly proved by ultraviolet photoelectron spectroscopy, electrochemical impedance spectroscopy, and photocurrent analysis.
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2024
·
IF 11.2
Huanmin Liu,Chao Wu,Kangle Lv,Dingguo Tang,Qin Li
Photogenerated charge separation is a challenging step in semiconductor-based photosynthesis. Though numerous efforts have been devoted to developing multi-component photocatalyst heterostructures for improving charge separation efficiency, the short distance between electrons and holes-aggregated regions still leads to undesirable charge recombination. Herein, a facile and commercial in-situ synthesis method was designed to directly prepare a three-component Au–carbon–TiO 2 photocatalyst from Ti 3 C 2 MXene , air, CO 2 , and HAuCl 4 , in which the carbon layer bridged Au and TiO 2 nanoparticles for stable and efficient photocatalytic hydrogen production. Kelvin probe measurements and density functional theory (DFT) calculations demonstrated that a multi-interfacial charge transmission network was successfully constructed to achieve a directional and long-distance spatial charge separation/transfer channel between TiO 2 and Au through carbon layer, desirably inhibiting the recombination of photogenerated charge carriers. The hydrogen production rate of the formed three-component Au/C–TiO 2 (CTA) photocatalyst was demonstrated to be 27 times higher than that of Au–TiO 2 , which also surpassed many reported Ti 3 C 2 MXene-derived carbon–TiO 2 photocatalysts. This work sheds light on the ingenious use of 2D MXene to form a well-behaved TiO 2 -based photocatalytic system and helps to propose future design principles in accelerating charge transfer.
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高影响因子
CARBOHYDRATE POLYMERS
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2019
·
IF 6.044
Jinping Ren,Furong Tao,Libin Liu,Xia Wang,Yuezhi Cui
Intelligent responsive materials with switchable wettability surfaces are of great importance in the field of oil/water separation. Here, a distinctive pH-responsive bio-based oil/water separation material was prepared. A low-cost titanium dioxide (TiO 2 ) and environmentally friendly chitosan (CS) were used to combine with stearic acid (SA) to form the superhydrophobic TiO 2 @SA/CS coating. The coated materials (cotton fabric, sponge and filter paper) can be converted from superhydrophobicity to superhydrophilicity under ammonia treatment, and the superhydrophobicity can be restored again after heating treatment. The stimuli-responsive surface of the material was applied for the separation of oil/water/oil ternary mixtures and for the effective separation of various surfactant-stabilized water-in-oil emulsions and oil-in-water emulsions before and after wettability conversion. These results may provide a new prospect for the development of intelligent responsive oil/water separation materials with controllable wettability.
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高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
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2022
·Vol. 128
·期 2
·1-8
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IF 2.983
Song Lixin,Qi Xueyang,Jing Wanru,Ke Huizhen,Chen Wei-Hsiang,Xiong Jie
The flexible nitrogen (N) doped TiO 2 /C nanofibrous film (NTC f ) was fabricated by a combination of electrospinning and annealing treatment. The BET surface area of the NTC f increases, reaches largest value, and then decreases slightly with increasing of N. And the NTC f -20 has a maximum BET surface area of 175.60 m 2 ·g −1 . These are beneficial to the absorption of dye by the photocatalyst. At the same time, the N doping could increase the light absorption of TiO 2 and is favorable to the charges transfer of the carbon nanofibers, resulting in improving the photocatalytic activity of NTC f under visible light. As a result, all the NTC f showed excellent photocatalytic performance. Moreover, with the increase of N concentration, the photocatalytic activity of the NTC f increased, reaching the largest value before decreasing. And the highest photocatalytic degradation efficiency of Rhodamine B (RhB) was about 99.1% for 1 h by using NTC f -20. After that, the NTC f film was stuck on organza fabric to form a photocatalytic fabric by hot pressing. And the photocatalytic fabric with degradation efficiency of 98.5% was easily separated from the dye solution and possessed excellent reusability. It has huge potential application in pollutant disposal in flowing water.
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高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2022
·
IF 4.644
Hengtao Xu,Zhe Hao,Weihua Feng,Ting Wang,Xiaohang Fu
To effectively treat organic pollutants in seawater , this study fabricated different floating photocatalytic spheres by loading TiO 2 -based photocatalysts to degrade tetracycline in simulated seawater. In photodegradation for tetracycline, the content of the active TiO 2 component in the powder photocatalyst played a major role in degrading the performance of the material. A polyurethane porous sponge with a large specific surface area was used as a carrier in loading the powder photocatalyst to avoid the interference of salt ions in seawater for photodegradation. The adsorption ability and performance in tetracycline photodegradation of the PU sponge-filled photocatalytic spheres were significantly higher than those of PMMA photocatalytic spheres under the same conditions. The Pt-deposited P25-A (Pt–P25-A) powder photocatalyst with the strongest visible light response exhibited the highest performance. The rate removal for tetracycline in the simulated seawater by the PU sponge-filled spheres loaded with Pt–P25-A exceeded 80% after 20 h.
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高影响因子
MATERIALS LETTERS
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2021
·
IF 3.423
Bingbing Pan,Zhouqiao Zhao,Pu Hu,Zhanhui Zhang,Zhiliang Huang
Li 4 Ti 5 O 12 /TiO 2 composite, pure Li 4 Ti 5 O 12 and Li 4 Ti 5 O 12 /Li 2 TiO 3 composite are synthesized through a high temperature solid-state approach by adjusting the molar ratio of Li/Ti precursors. Pure Li 4 Ti 5 O 12 can be obtained when the molar ratio of Li/Ti precursor materials is 0.80, while low and over stoichiometric ratio of Li 4 Ti 5 O 12 would lead to the formation of the second phase of rutile TiO 2 and Li 2 TiO 3 , respectively. The electrochemical performance of the obtained materials as anode materials for Li-ion batteries is tested under potential range of 0.02–2.5 V in Li half-cell. The results show that all the samples exhibit two potential plateaus at ~1.5 V and ~0.75 V at various C-rate. Among the obtained samples, Li 4 Ti 5 O 12 /TiO 2 composite exhibits the best cycling stability and rate capability. The second phase TiO 2 facilitates the diffusion of Li + and significantly enhances the rate capability.
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高影响因子
DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 16
·5652-5659
·
IF 4.099
Yong-Jun Yuan,Gaoliang Fang,Daqin Chen,Yanwei Huang,Ling-Xia Yang,Da-Peng Cao,Jingjing Wang,Zhen-Tao Yu,Zhi-Gang Zou
Expanding the photoresponse range of TiO2-based photocatalysts is of great interest for photocatalytic H2 production. Herein, noble-metal-free CuInS2 quantum dots were employed as a novel inorganic dye to expand the visible light absorption of TiO2/MoS2 for solar H2 generation. The as-prepared CuInS2/TiO2/MoS2 photocatalysts exhibit broad absorption from the ultraviolet to near-infrared region. Under visible light irradiation (λ > 420 nm), the CuInS2/TiO2/MoS2 photocatalyst with 0.6 mmol g−1 CuInS2 and 0.5 wt% MoS2 showed the highest H2 evolution rate with a value of 1034 μmol h−1 g−1. Moreover, a considerable H2 evolution rate of 141 μmol h−1 g−1 was obtained under the irradiation of the optimized CuInS2/TiO2/MoS2 photocatalyst with >500 nm light. The reaction mechanism of the CuInS2/TiO2/MoS2 photocatalyst for photocatalytic H2 evolution was investigated in detail by photoluminescence decay study, and the results showed that the photoexcited electrons of CuInS2 can be transferred efficiently through TiO2 to MoS2 and then react with the absorbed protons to generate H2. The reported sensitization strategy tremendously improves the visible light absorption capacity and the photocatalytic performance of TiO2-based photocatalysts.
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高影响因子
WATER RESEARCH
·
2019
·
IF 7.913
Yang Si,Ai-Yong Zhang,Chang Liu,Dan-Ni Pei,Han-Qing Yu
Bisphenol A (BPA) is a semi-persistent environmental endocrine disrupter and widely present in aqueous environments. Electrochemical detection is an effective method to monitor pollutants like BPA in aqueous environments. However, the electrode fouling from anodic polymeric products is one main barrier of electrochemical sensors for their practical applications. In this work, a renewable electrochemical sensor was rationally designed, constructed and tested for efficient BPA detection. The TiO 2 anodic material was surface-engineered by inorganic-framework molecular imprinting sites with tailored morphological shape, exposed facet and crystal structure. This electrode could be activated mainly as an electrochemical catalyst and partially as a photochemical catalyst. The developed TiO 2 -based sensor exhibited a good detection reliability and cyclic stability for determining BPA in water samples, with an electrochemical signal decrease of less than 5.0% in 10-run cyclic tests. By virtue of the bi-functional properties of the tailored TiO 2 anodic material, a unique photo-assisted electrochemical sensor was further developed, in which analyte digestion and analytical signal originated mainly from anodic conversion. Such a synergistic digesting mechanism distinguishes it from the reported electro-assisted photochemical TiO 2 sensors. Our work provides a robust sensor for monitoring pollutants in aqueous environments and a new opportunity to develop renewable electrode materials with good reusability .
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2013
·
IF 4.093
Qiang Xu,Jun Yang,Jiawei Dai,Yang Yang,Xiaoqiang Chen,Yong Wang
The uses of porous polypropylene (PP) membranes are limited in water-based separations because of their strong hydrophobicity . To improve the separation performances of polypropylene membranes by hydrophilization, we deposited TiO 2 on their pore surface using the atomic layer deposition strategy with and without a pretreatment to the membrane by plasma. The direct deposition without plasma pretreatment led to slightly enhanced hydrophilicity because TiO 2 was slowly deposited on the membrane as discrete particles due to the lack of active groups on the bare polypropylene surface. In contrast, after a short exposure to plasma generated in air, oxygen-containing active groups were formed on the membrane and subsequent atomic layer deposition yielded conformal thin layer of TiO 2 on the pore walls. The deposited membranes showed remarkably enhanced hydrophilicity and higher deposition cycles led to stronger hydrophilicity. As a consequence of the enhanced hydrophilicity, the permeability and retention of the deposited membrane were simultaneously improved with big amplitudes. For example, an increase in pure water flux of ~60% and a more than doubled retention ratio were obtained by deposition of TiO 2 for 150 cycles on the plasma-activated polypropylene membrane. Furthermore, the TiO 2 -deposited membranes showed improved resistance to protein fouling compared to unmodified membranes also because of the enhanced hydrophilicity. Such a hydrophilization strategy of plasma pretreatment and subsequent atomic layer deposition of metal oxides is expected to be also effective in the upgrading of performances of other membranes with inert surfaces.
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高影响因子
危险品化学品经营许可证（带存储）