JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 12
·7587-7597
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IF 4.22
Liu Linqing,Zhong Xia,Li Mingqi
Abstract In order to investigate the synergistic effect of TiO 2 and TiN on the electrochemical performance of SiO as anodes for lithium ion battery, a series of SiO/TiO 2 -TiN hybrid materials with different compositions are synthesized through simple high-energy mechanical ball milling using SiO, nano-TiO 2 and nano-TiN as raw materials. Compared with TiO 2 or TiN alone, the combination of TiO 2 and TiN can significantly improve the utilization and cycle stability of SiO. Among them, the 65%SiO/35%(TiO 2 -TiN(8:2)) hybrid exhibits the best comprehensive electrochemical performance. Even at a relatively high mass loading and compaction density, the stable discharge capacity of the electrode is about 920 mAh g −1 at 100 mA g −1 . At 500 mA g −1 , the stable discharge capacity is kept at about 760 mAh g −1 until 250 cycles. When the current density increases to 1600 mA g −1 , the stable capacity is still as high as 480 mAh g −1 . The improved electrochemical performance is attributed to the synergistic effect of TiO 2 and TiN in buffering the volume effect of Si and improving the conductivity of SiO. Different from the previous report, it is found that although the crystal structure of TiN is not destroyed during cycling, its initial reversible pseudocapacitance capacity reaches 80 mAh g −1 at 500 mA g −1 . Graphical abstract
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2020
·
IF 4.192
Jianlin Li,Tingting Cai,Wei Li,Weiwei Li,Laicui Song,Qianjin Li,Guangping Lv,Jialong Sun,Saisai Jiao,Siwei Wang,Yu Jin,Tiesong Zheng
A new protein microarray method for multiplex mycotoxin detection in parallel has been established on a stable TiO2-modified porous silicon (PSi) surface. A typical competitive immunoassay microarray protocol has been developed for simultaneous detection of multiplex mycotoxins including aflatoxin B1 (AFB1), ochratoxin A (OTA), and fumonisin B1 (FB1) on the TiO2-PSi surface. The epoxy groups were selected to modify the surface of a TiO2-PSi wafer for the immobilization of artificial antigens of mycotoxins because of their high signal-to-noise ratios. Under optimal conditions, the developed method showed wide linear detection ranges of 0.01–1 ng/mL for OTA, 0.001–1 ng/mL for AFB1, and 0.01–1 ng/mL for FB1 and low limit of detections (LODs) of 0.433 ng/mL for OTA, 0.243 ng/mL for AFB1, and 0.093 ng/mL for FB1. The microarray method can specifically identify the three mycotoxins and their analogues. The recovery rates in real samples were within 75–120%, which were in agreement with that of the classical ELISA method. The new method has great application potential for rapid, sensitive, and high-throughput screening of multiplex mycotoxins and other target molecules.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Xuesong Liu,Peng Jiang,Yong Chen,Yaoguang Wang,Qiaoling Ding,Zhiming Sui,Hongfeng Chen,Zhongyun Shen,Xiaodong Wu
Two Ce-W-Ti mixed oxide catalysts were prepared by wet impregnation (CeW/Ti-I) and mechanical mixing (Ce/W/Ti-M) methods. CeW/Ti-I catalyst exhibits over 80% NO x conversion and nearly 100% N 2 selectivity at 200–550 °C. The superior catalytic performance is associated with the high dispersion of active CeO 2 and acidic WO 3 on TiO 2 and the synergistic effects among different components. The X-ray Diffraction, Raman spectroscopy, Nitrogen physisorption, X-ray photoelectron spectroscopy, H 2 temperature-programmed reduction, temperature-programmed desorption of ammonia and infrared spectroscopy were performed. It is found that the formation of solid solutions, as well as the high specific surface area, would increase the amounts of Ce 3+ , oxygen vacancies and acid sites in the catalyst. These broaden the operating temperature window of NH 3 -SCR reaction and enhance the N 2 selectivity by facilitating “fast SCR” reaction at low temperatures and inhibiting the unselective oxidation of NH 3 at high temperatures.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Wenliang Liu,Su Chang,Dong Liu,Fushan Wen
Three-dimensional ordered macroporous (3DOM) materials have been widely concerned due to the unique structure. Herein, pure TiO 2 , pristine g-C 3 N 4 , 3D-Ti (TiO 2 with 3DOM structure) and 3D-xCN/Ti (x = 25 and 35 wt %) (3DOM materials with a certain ratio of TiO 2 and g-C 3 N 4 as the pore walls) were prepared. The morphologies of the samples were characterized by SEM, TEM and HRTEM, and the physical and chemical properties of the samples were explored by FT-IR, XPS, BET and UV–vis DRS. The 3D-25CN/Ti, with the structure of 3DOM and the couple of g-C 3 N 4 and TiO 2 , extended the light spectral responsive range, and exhibited an excellent hydrogen evolution rate (14.1 mmol g −1 h -1 ) , which was 28 times that of pure TiO 2 (0.55 mmol g −1 h -1 ) under simulated sunlight. The high hydrogen evolution rate is attributed to the synergistic effect of the great separation and transfer capability of charge carriers and the larger specific area, which originate from the g-C 3 N 4 /TiO 2 heterojunction and the 3DOM structure, respectively. The effective separation of the carriers was further confirmed through the photoluminescent spectroscopies and a series of photoelectrochemical experiments: Tafel, transient photocurrent response, electrochemical impedance. Finally, the mechanism of the photocatalytic hydrogen evolution was briefly discussed. These investigations reveal an important new strategy for improving the efficiency of photocatalytic hydrogen evolution.
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CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Jingjing Xu,Wenting Li,Zhenhao Cao,Yapei Jiao,Xue Li
In this work, a poly(ethylene glycol)-b-poly(1H,1H,7H-dodecafluoroheptyl methacrylate) (PEG- b -PDFMA) block copolymer was first synthesized by the reversible addition−fragmentation chain transfer (RAFT) polymerization. Then a novel facile approach was developed to fabricate oval cuboid TiO 2 particles with mesoporous structure by using the PEG- b -PDFMA block copolymer as a template and titanium tetrabutoxide (TBOT) as a precursor, followed by evaporation-induced self-assembly (EISA) process and calcination process. The results show that the PEG- b -PDFMA block copolymer can control the oriented assembly of nanoparticles and act as templates for the formation of a mesopore. It is found that the mass ratio of TBOT/PEG- b -PDFMA and water content in the solution have a significant influence on the morphology of TiO 2 particles. When the mass ratio of TBOT/PEG- b -PDFMA is 0.25/1, oval cuboid TiO 2 particles with mesopores are obtained, which exhibits a high photocatalytic activity for the degradation of methylene blue (MB) dye under UV light irradiation.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Qiong Sun,Songhao Wu,Kaijing Li,Bing Han,Yingjie Chen,Beili Pang,Liyan Yu,Lifeng Dong
The improved photocatalytic activity of TiO 2 with the addition of spinel CoFe 2 O 4 as an effective catalyst for O 2 reduction reaction (ORR) is studied and proved in this study. CoFe 2 O 4 -TiO 2 heterostructure nanoparticles are prepared by a reflux condensation and two-step hydrolysis-hydrothermal method. The addition of trace CoFe 2 O 4 onto TiO 2 can improve its affinity to O 2 , generate a faster transportation of photo-induced carriers, but hardly affect band structure. With an appropriate amount of CoFe 2 O 4 to TiO 2 , a remarkable acceleration occurs in photocatalytic decolorization of dye wastewater, and the calculated apparent kinetic constant ( k app ) of the composite (0.020 min −1 ) is 2.4 and 5.6 times of pure TiO 2 (0.0085 min −1 ) and CoFe 2 O 4 (0.0036 min −1 ), respectively. Quenching experiments with different radical scavengers show that O 2 –∙ is the key oxidative radical in all photocatalytical reactions. Meanwhile, the rapid growth of O 2 –∙ production by CoFe 2 O 4 -TiO 2 is proved to be a major cause for photocatalytic performance improvement. Furthermore, an improved electrochemical ORR catalytic ability by CoFe 2 O 4 -TiO 2 is verified and the 2-plus-2 electron route generates the same product (H 2 O 2 ) as the photocatalytic process. Therefore, the synergistic operation of photocatalytic and catalytic ORR process by CoFe 2 O 4 -TiO 2 resulted in a rapid degradation of dye wastewater.
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Fanyu Meng,Lina Guo,Haocheng Zou,Boming Zhu,Fayang Zhou,Yiqing Zeng,Jiayou Han,Jun Yang,Shule Zhang,Qin Zhong
To achieve high NO oxidation efficiency, excessive O 3 must be used, which would lead to the high cost and escape of ozone. Herein, we adopted low cost and environmental-friendly TiO 2 as the catalyst of low concentration O 3 and H 2 O 2 system for high-efficiency NO x oxidation. The Ti sites on TiO 2 were the deprotonation sites of H 2 O 2 and H 2 O into Ti-OOH and Ti-OH species, respectively. We found that the surface of rutile phase TiO 2 had a low concentration Ti-OOH component but a large amount of Ti-OH after contacting with H 2 O 2 solution, thus lots of ·OH and a few O 2 − radicals formed with introducing O 3 molecules. H 2 O 2 solution induced the formation of a large amount of Ti-OOH and Ti-OH species on the anatase phase TiO 2 surface, thus lots of O 2 − generated in the O 3 /H 2 O 2 system. O 2 − and O H radicals could efficiently oxidize NO, in which O 2 − radicals could oxidize NO to NO 3 − in one step with high selectively. Therefore, anatase TiO 2 had better performance in NO x oxidation than rutile phase TiO 2 . The effect of temperature and SO 2 concentration on NO oxidation was also investigated, the results showed that TiO 2 -A/O 3 /H 2 O 2 system promoted NO oxidation at a low temperature and a low concentration of SO 2 .
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SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Yongshan Xu,Lingli Zheng,Chen Yang,Wei Zheng,Xianghong Liu,Jun Zhang
Constructing heterostructures with efficient modulation of electron transfer at the heterointerface affords great opportunity for electronic devices. Herein, a high performance nanosensor based on core-shell ZnO@TiO 2 nanorods is successfully realized for n-butanol detection. The n-n heterointerface formed between TiO 2 and ZnO allows for vast variation of conductivity due to electron confinement induced by their different works functions and enhances the response on exposure to gaseous molecules. Studies reveals that the shell thickness of TiO 2 has a great impact on the sensor performances, and the sensor based on ZnO@TiO 2 nanorods with 6.4 nm-thick TiO 2 shell delivers outstanding gas sensing properties in terms of high sensitivity, low detection limit (133 ppb), fast response-recovery, and excellent selectivity towards n-butanol detection. The mechanism for the improved gas sensing function is ascribed to the heterojunctions of core-shell nanostructure, the enhanced oxygen adsorption due to the TiO 2 shell and the fully electron-depleted TiO 2 shell layer with a thickness comparable to the Debye length. The strategy presented here is generally applicable and can provide some hints to design efficient electronic sensors with optimized performances.
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Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 24
·8206-8212
·
IF 7.059
Chunxiu Zang,Hui Wang,Shihao Liu,Wenbin Guo,Letian Zhang,Wenfa Xie
TiO2 is widely used in optoelectronic devices especially organic solar cells due to its excellent optical and electrical properties. However, its application in organic light-emitting devices (OLEDs) as an electron injection layer (EIL) usually suffers from insufficient electron injection and serious interfacial quenching, leading to low efficiency. In this work, efficiency enhancement of inverted OLEDs (IOLEDs) based on a TiO2 EIL by introducing various interlayers (ILs) is reported. Polyethylenimine (PEI), 10,10′-[5-(6-[1,1′-biphenyl]-4-yl-2-phenyl-4-pyrimidinyl)-1,3-phenylene] bis[9,10-dihydro-9,9-dimethyl-acridine] (DMAC-BPP) and 2,2′,2′′-(1,3,5-benzinetriyl)-tris(1-phenyl-1-H-benzimidazole) (TPBI) are adopted as ILs to reduce quenching, improve electron injection by achieving stepped energy levels and achieve efficient exciton confinement. Compared with devices using PEI/TPBI interlayers, over 40% enhancement of the maximum external quantum efficiency (EQEmax) for TiO2-based IOLEDs by introducing DMAC-BPP interlayers is achieved. Furthermore, efficient carrier confinement and more balanced carrier injection are achieved by inserting a thin TPBI between DMAC-BPP and the emitting layer (EML), and then, the EQEmax is improved to 17.68%, which is the highest record for TiO2-based IOLEDs.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Zhuang Wang,Asad Mahmood,Xiaofeng Xie,Xiao Wang,Hanxun Qiu,Jing Sun
For the oxide-based photocatalysts, polyoxylic acid modification can affect their adsorption/desorption properties and further regulate photocatalytic reaction pathway, which is crucial for enhancing photocatalytic activity and selectivity. Herein, phosphoric acid modified TiO 2 was synthesized by a facile impregnation-calcination method for photocatalytic degradation of gaseous o-xylene. According to FTIR, XPS, and EDS analysis, phosphoric acid was anchored on the surface of TiO 2 successfully. The surface P atomic percentages for PT1 was 2.45%. The as-prepared phosphoric acid modified TiO 2 (PTx) had a photocatalytic performance superior to that of commercial TiO 2 and unmodified TiO 2 (PT0), with increasing by 2.2 times at most. Interestingly, the phosphoric acid molecules strongly adsorbed on anatase TiO 2 surface by forming H–O 2C and =O–Ti 5C chemical bonds according to the first principle calculations, which changed TiO 2 surface properties (specific surface area and surface negative electrostatic field) and further improved adsorption and charge carrier separation and transfer, thus improving the photocatalytic activity. Additionally, according to the intermediates results, the relative abundance of intermediates shows obvious difference. Acetone was detected as the most abundant intermediates during o-xylene degradation for PT0, whereas that was o-methyl benzaldehyde for PT1, which could be ascribed to the difference of surface adsorption configuration of o-xylene. According to the temperature-programmed desorption (TPD) results, the surface modified by phosphoric acid could change the o-xylene adsorption configuration to favor its methyl oxidation (standing configuration), whereas the unmodified surface could be more favorable to the benzene ring-open reaction (lying configuration). This work will deepen the understanding of the relevance of surface modification and surface photocatalytic reaction, which also provides a feasible strategy to improve photocatalytic selectivity.
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Catalysts
·
2020
·Vol. 10
·期 5
·539
·
IF 3.52
Lan Luo,Tingting Zhang,Xin Zhang,Rongping Yun,Yanjun Lin,Bing Zhang,Xu Xiang
Hydrogen production by photoreforming of biomass-derived ethanol is a renewable way of obtaining clean fuel. We developed a site-specific deposition strategy to construct supported Au catalysts by rationally constructing Ti3+defects inTiO2nanorods and Cu2O-TiO2p-n junction across the interface of two components. The Au nanoparticles (~2.5 nm) were selectively anchored onto either TiO2nanorods (Au@TiO2/Cu2O) or Cu2O nanocubes (Au@Cu2O/TiO2) or both TiO2and Cu2O (Au@TiO2/Cu2O@Au) with the same Au loading. The electronic structure of supported Au species was changed by forming Au@TiO2interface due to the adjacent Ti3+defects and the associated oxygen vacancies while unchanged in Au@Cu2O/TiO2catalyst. The p-n junction of TiO2/Cu2O promoted charge separation and transfer across the junction. During ethanol photoreforming, Au@TiO2/Cu2O catalyst possessing both the Au@TiO2interface and the p-n junction showed the highest H2production rate of 8548 μmol gcat−1h−1under simulated solar light, apparently superior to both Au@TiO2and Au@Cu2O/TiO2catalyst. The acetaldehyde was produced in liquid phase at an almost stoichiometric rate, and C−C cleavage of ethanol molecules to form CH4or CO2was greatly inhibited. Extensive spectroscopic results support the claim that Au adjacent to surface Ti3+defects could be active sites for H2production and p-n junction of TiO2/Cu2O facilitates photo-generated charge transfer and further dehydrogenation of ethanol to acetaldehyde during the photoreforming.Keywords:ethanol reforming;hydrogen production;Au catalyst;Ti3+defect;site-specific deposition
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2020
·Vol. 412
·期 23
·5779-5787
·
IF 3.637
Dai Panpan,Ke Jiajun,Xie Chenggen,Wei Liyun,Zhang Ying,He Yong,Chen Lijuan,Jin Juncheng
A sensitive electrochemiluminescence (ECL) assay for microRNAs (miRNAs) based on a semiconductor nanomaterial sensitized with noble-metal Au nanoparticles (NPs) is successfully developed. TiO 2 nanotubes (NTs) were equipped with Au NPs to obtain an enhanced ECL emitter. Then, an ECL assay for miRNA-21 was fabricated, which was based on the use of probe 2 DNA–functionalized Pt/PAMAM nanocomposites (NCs) assembled on the surface of Au/TiO 2 NT conjugate via DNA hybridization between probe 1 DNA and capture DNA. The Pt/PAMAM NCs act as an ECL quencher of Au/TiO 2 NTs via resonance energy transfer. After the binding of target miRNA-21 and the capture DNA, the Pt/PAMAM NCs were released and the ECL signal was recovered. An “off–on” ECL assay was achieved with a linear response from 0.01 to 10,000 pM. Finally, this method has been validated to be sensitive and specific for miRNAs in human serum samples. The ECL enhancement strategy opens a new way for fabricating various sensitive biosensors.
A sensitive “off–on” electrochemiluminescence analysis method was developed, which combined Au NP–enhanced ECL emission of TiO 2 nanotubes and an efficient energy-transfer system between Au/TiO 2 nanotubes and Pt/PAMAM nanocomposites
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