JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Peijun Yang,Zhidan Diao,Hui Jin,Shaohua Shen
Sodium-ion batteries (SIBs) have attracted much attention for their high energy densities and low cost. However, the unstable solid-liquid interphase seriously restricts the development and application of SIBs. Herein, Ca(ClO 4 ) 2 as a new-type electrolyte additive is developed to engineer the solid-liquid interphase of carbon-coated anodes. In the electrolyte with an appropriate concentration of Ca(ClO 4 ) 2 , Ca 2+ can insert into the carbon coating and form a passivation layer during the first cycle, reducing the irreversible sodium-ion capture in the carbon coating and the electrolyte decomposition at the solid-liquid interface. Thus, the carbon-coated anode with a thin and stable solid electrolyte interphase (SEI) layer formed realizes the superior sodium storage performance with enhanced sodium-ion diffusion kinetics. Specifically, after adding 0.015 M Ca(ClO 4 ) 2 into the electrolyte, the reversible capacity of carbon-coated TiO 2 anode could be greatly improved from 271.2 mAh g −1 to 335.1 mAh g −1 at 50 mA g −1 , with the initial coulombic efficiency increasing from 41.2 % to 48.7 %. This study provides an alternative strategy to optimizing the SEI layer of carbon-coated TiO 2 anode for superior sodium storage property, which also can be applied to other carbon-coated anodes for SIBs.
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ChemCatChem
·
2019
·Vol. 11
·期 16
·3919-3926
·
IF 4.495
Ke Liu,Zhenbo Zhao,Weiwei Lin,Qiang Liu,Qifan Wu,Ruhui Shi,Chao Zhang,Haiyang Cheng,Masahiko Arai,Fengyu Zhao
Graphical Another drop of copper : A non-noble metal catalyst of Cu/TiO 2 is effective for the heterogeneous N -methylation of N -methylaniline with CO 2 and H 2 , in which CHO* is formed as methyl reagent, and it reacts with N -methylaniline to produce intermediate N -methylformanilide followed by its hydrogenation to N,N -dimethylaniline. A non-noble heterogeneous catalyst of Cu/TiO 2 was prepared for N -methylation of N -methylaniline (MA) with CO 2 and H 2 . 5 wt.–% Cu loaded TiO 2 (P25) catalyst exhibited a high performance, with 82 % MA conversion and 98 % N,N -dimethylaniline (DMA) selectivity under the reaction conditions used (4 MPa H 2 , 2 MPa CO 2 , 180 °C, 36 h). The Cu/TiO 2 catalyst was more effective with respective to the total conversion and the DMA selectivity as compared to 5 wt.–% Cu loaded catalysts on CeO 2 , ZnO and activated carbon materials. The possible active species of Cu/TiO 2 catalyst should be both Cu + and Cu 0 which contributed to the high activity as the reaction conversion increased linearly with them exposed on the surface of catalyst. Moreover, the reaction pathways involved were studied; it was likely that the reaction took place via an intermediate of formaldehyde that was formed from CO 2 and H 2 , as confirmed by in situ diffuse reflectance Fourier-transform infrared spectroscopy, then it reacted with MA to give N -methylformanilide (MFA), and finally MFA was hydrogenated to DMA.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Minghua Wang,Yongkang Liu,Longyu Yang,Kuan Tian,Linghao He,Zhihong Zhang,Qiaojuan Jia,Yingpan Song,Shaoming Fang
A series of composites comprising FeO x and TiO 2 nanoparticles uniformly distributed throughout a mesoporous carbon matrix (hereafter denoted as FeO x /TiO 2 @mC nanocomposites) was synthesized by the direct pyrolysis of a bimetallic Fe/Ti-based metal–organic framework at high temperatures (500, 700, and 900 °C). It shows that the as-prepared FeO x /TiO 2 @mC nanocomposites exhibit large specific surface areas and hierarchically micro/mesoporous hybrid structures, further leading to high electron transfer rate. Combining the highly electrocatalytic activity of TiO 2 and FeO x and the good charge-transfer capability of mesoporous carbon, the caused synergism enables the construction of novel and platforms for sensitively detecting 4-nitrophenol (4-NP). After the optimization of sensitive layers and detection conditions, FeO x /TiO 2 @mC 700 (calcined at 700 °C) is found to exhibit high detection ability toward 4-NP owing to its excellent electrochemical performance and electrocatalytic activity. The FeO x /TiO 2 @mC 700 -based electrochemical sensor shows a low limit of detection of 0.183 μM (S/N = 3) within the linear range of 5–310 μM as determined using amperometry toward 4-NP. The proposed method also displays good anti-interference ability, stability, and applicability toward 4-NP determination in environmental water samples. All these results suggest that the components of the MOF-derived binary metal oxide/mesoporous carbon electrocatalyst can function as a novel electrocatalyst for more endeavors into the development of a promising sensing platform for hazardous compounds in the environment.
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TALANTA
·
2018
·
IF 4.244
Yue Wang,Xue Li,Geoffrey I.N. Waterhouse,Yunlei Zhou,Huanshun Yin,Shiyun Ai
In this work, a novel and sensitive photoelectrochemical (PEC) strategy was designed for protein kinase A (PKA) detection, comprising carbon microsphere (CMS) modified ITO electrode, TiO 2 as the phosphate group recognition material and graphite-carbon nitride (g-C 3 N 4 ) as photoactive material. For the first time, gold nanoparticle decorated zeolitic imidazolate frameworks (Au-ZIF-8) was employed to fabricate biosensor for PKA activity assay with the function of substrate peptide immobilization and signal amplification. Firstly, substrate peptides were assembled on the Au-ZIF-8/CMS/ITO surface through the covalent bonding between the gold nanoparticles (AuNPs) and sulfydryl groups of the peptides. Then, in the presence of ATP , phosphorylation of the substrate peptide was achieved under PKA catalysis. Finally, TiO 2 -g-C 3 N 4 composites were further modified on the electrode surface based on bonding between TiO 2 and phosphate groups created via phosphorylation of the peptide (yielding TiO 2 -g-C 3 N 4 /P-peptide/Au-ZIF-8/CMS/ITO), which is different with our previous work by directly immobilizing g-C 3 N 4 composite on electrode surface. The developed method showed a wide linear range from 0.05–50 U mL −1 . The detection limit was 0.02 U mL −1 (S/N = 3). The constructed biosensor exhibited high detection specificity for PKA. In addition, the wide applicability of this biosensor was demonstrated by evaluating the inhibition ability of ellagic acid towards PKA.
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SURFACE & COATINGS TECHNOLOGY
·
2019
·
IF 3.192
Yutang Kang,Shihui Jiao,Yue Zhao,Zhenwei Zhang,Boran Wang,Guangsheng Pang
A stainless steel mesh supported TiO 2 nanowires membrane is prepared by heating hydrogen titanate nanowires deposited on stainless steel mesh. The stainless steel mesh supported TiO 2 nanowires membrane exhibits superhydrophilic and underwater superoleophobic property. The water contact angles in air of the stainless steel mesh supported TiO 2 nanowires membrane is 0° and the underwater oil contact angles (gasoline, n-hexadecane, hexamethylene and methylbenzene) are >150°. Both of surfactant-free oil-in-water mixtures and surfactant-stabilized emulsions are separated with a high permeation flux of >10 6 L m − 2 h − 1 bar − 1 and a separation efficiency of >99.1%. The stainless steel mesh supported TiO 2 nanowires membrane exhibits good resistant to fouling, and the possible organic pollutants are easy to be removed by heat treatment and the superhydrophilic and underwater superoleophobic property is recovered.
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Nanoscale
·
2019
·Vol. 11
·期 15
·7424-7432
·
IF 6.97
Shumeng Bi,Ling Zhang,Chunzhong Li
High-performance packaging materials featuring a superior gas barrier and UV resistance as well as excellent mechanical properties are highly desirable but are still encountering serious challenges in the food, pharmaceutical and electronic industries. Here, a multifunctional film based on a modified titanium dioxide@graphene oxide/poly(vinyl alcohol) (TiO2@GO/PVA) nanocomposite with a multilayer nano-brick wall structure is rationally designed and fabricated by a facile solution casting approach. The modified TiO2 nanoparticles, assembled on the surface and edges of GO, are employed as bridges to construct the GO edge-to-edge alignment. Then, they tightly combine with PVA chains, acting as the mortar, to form a multilayer compact film. Therefore, the oxygen permeability of the nanocomposite film decreases to 0.119 × 10−17 cm3·cm (cm2·s·Pa)−1 with the addition of 1.0 wt% GO and 1.2 wt% modified TiO2, reduced by 93% compared with pure PVA film. More impressively, it is increased by only 5.9% after 9 h of ultraviolet light irradiation, which shows its exceptional UV resistance ability. In addition, the mechanical performance, thermal stability and water resistance are substantially improved. The developed modified TiO2@GO/PVA nanocomposite films with outstanding performance can be perceived as a green biodegradable material for a wide range of packaging industries.
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CHEMICAL PAPERS
·
2019
·Vol. 73
·期 8
·1971-1978
·
IF 1.246
Liu Xiue,Sun Chen,Yue Yundi,Yan Tingjiang,He Yuanchun,Yu Yang,Li Wenjuan,Wang Wenliang,Zhu Kunlei,Jing Zhihong
Three-dimensional (3D) AgBr/TiO 2 microspheres with remarkable sea urchin-like architectures were prepared by a solvothermal-hydrothermal two-step process. The products have been characterized through XRD, SEM, HRTEM and Nitrogen adsorption–desorption analysis. The antibacterial activity of the 3D AgBr/TiO 2 microspheres against Escherichia coli ( E. coli ) was investigated quantitatively by microcalorimetric method for the first time. Meanwhile, the visible-light photocatalytic performance of the 3D AgBr/TiO 2 microspheres was also evaluated for the degradation of rhodamine B (RhB). As a contrast, the same tests were carried out for the conventional AgBr/P25 (TiO 2 ). The results show that the 3D AgBr/TiO 2 microspheres prevent better antibacterial and visible-light photoctalytic performance than the conventional AgBr/P25. It revealed that unique morphology effect, the extraordinary visible-light responses of AgBr and various oxidative radicals produced by visible light irradiated 3D AgBr/TiO 2 microspheres are responsible for improved antibacterial and photocatalytic performance.
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Catalysis Science & Technology
·
2018
·Vol. 9
·期 2
·336-346
·
IF 5.365
Jinjin Lin,Jiangshan Hu,Chengwei Qiu,Huijuan Huang,Lu Chen,Yanyu Xie,Zizhong Zhang,Huaxiang Lin,Xuxu Wang
Solar-driven carbon dioxide (CO2) reduction with water is an important and attractive approach for converting CO2 to fuel and chemicals. Developing intimate heterostructure photocatalysts is essential for efficient solar energy conversion. Here, we fabricated an efficient CaTiO3/TiO2 heterostructure composite by simple in situ hydrothermal etching of {001} facet-exposed TiO2 nanosheets with saturated calcium hydroxide solution. CaTiO3/TiO2 not only possesses an intimate contact heterostructure due to its matching band structures and similar crystal structures but also has enhanced-surface basicity to facilitate CO2 adsorption and activation for the CO2 conversion. Under irradiation, the CaTiO3/TiO2 sample greatly enhances photocatalytic CO2 reduction and shows CO production (11.72 μmol g−1 h−1) 5.6 times higher than that of bare TiO2 nanosheets. The excellent photocatalytic performance of the CaTiO3/TiO2 heterostructures is attributed to the intimate construction of CaTiO3 on TiO2 nanosheets to facilitate the separation of photogenerated charges and the basicity of CaTiO3 to provide more abundant active sites for CO2 adsorption. This study provides fundamental guidance for the rational design of efficient heterostructure photocatalysts for an outstanding photocatalytic CO2 reduction performance.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
·
IF 14.229
Jingju Cai,Minghua Zhou,Yuwei Pan,Xuedong Du,Xiaoye Lu
Efficient anode materials are essential to electrochemical advanced oxidation processes (EAOPs) for organic wastewater treatment. In this regard, blue TiO 2 nanotube arrays (Blue-TNA) anode was prepared for the first time in formic acid electrolyte by electrochemical self-doping and applied for electrochemical degradation of contaminants. Characterized by XPS, Raman and Mott-Schottky curves, the formation of Ti 3+ on Blue-TNA was confirmed. This anode was more efficient and had a higher hydroxyl radical production activity (1.7 × 10 −14 M) than BDD (9.8 × 10 -15 M), inducing a higher TOC and COD removal of 100 mg/L phenol with a lower energy consumption of 9.9 kW h/(kg COD) at current density 2.5 mA/cm 2 , pH 5 in 0.1 M Na 2 SO 4 , account for the lower accumulation of degradation intermediates. Both • OH and SO 4 •- were responsible for the degradation on Blue-TNA anode, while their contributions differed greatly with that of BDD, and could be affected and regulated by the operating parameters like current density, initial pH and Na 2 SO 4 concentration. Blue-TNA anode represented a relative stable performance for 5 cycles degradation of 100 mg/L phenol for each cycle of 300 min, and such an oxidation capacity could be easily regenerated by electrochemical reduction in formic acid. Blue-TNA anode had an excellent performance on the TOC removal and MCE especially at low current density of 2.5 mA/cm 2 when compared with other anodes. Therefore, Blue-TNA anode is hopeful a promising and cost-effective anode for electrochemical oxidation.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 12
·11108-11116
·
IF 2.195
Jiang Xishun,He Wenjun,Zheng Shaokang,Shi Yonghua,Sun Zhaoqi
A series of TiO 2 nanostructures with rutile phase were synthesized on arbitrary substrates of conductive transparent fluorine-doped tin oxide (FTO), tin-doped indium oxide (ITO), and glass at the low temperature of 150 °C by the hydrothermal method. The samples were characterized by XRD, SEM, TEM, XPS, UV–Vis absorption, and micro-Raman spectroscopy. The effects of growth substrates on the morphologies and optical properties of nanostructures were investigated. TiO 2 nanorods were grown on the FTO substrate, while TiO 2 nanoflowers were grown on the ITO and glass substrates, and the growth mechanism for these different nanostructures is discussed in detail. The results show that the TiO 2 nanorods can improve photocatalytic properties and photoelctrochemical (PEC) performance for its unique structure and optical properties. The TiO 2 nanorods exhibited a maximal photocatalytic rate of 4.42 min −1 and photocurrent density of 0.049 mA/cm 2 , which is about 1.52 and 3.03 times higher than those of TiO 2 nanoflowers grown on the ITO substrates, respectively. These findings are quite promising and encouraging for the use of TiO 2 nanoarrays in photocatalysis and energy applications.
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ChemSusChem
·
2019
·Vol. 12
·期 19
·4412-4420
·
IF 7.804
Da Li,Wei Zhao,Lei Cao,Yiying Gao,Yahui Liu,Weijing Wang,Tao Qi
Graphical In the mix : A mixed-surfactant-assisted synthesis of dual-phase Li 4 Ti 5 O 12 -TiO 2 hierarchical microspheres is proposed. The ratio of anionic/cationic surfactant regulates the dual-phase ratio and primary structure morphology of the final product. The optimal sample obtained has a better electrochemical performance than similar state-of-the-art materials. A mixed-surfactant-assisted method was developed to synthesize dual-phase Li 4 Ti 5 O 12 -TiO 2 hierarchical microspheres. The ratio of anionic/cationic surfactant could regulate the primary structure morphology and the dual-phase ratio of the final product, in which the primary structure morphology could be stacked nanosheets, small nanoparticles, or large nanoparticles. The sample with a primary structure morphology of small nanoparticles had the highest specific surface area of 79.38 m 2 g −1 and the best electrochemical performance because of its high Li + migration rate, low polarization, and appropriate TiO 2 content. Its capacity reached 153.5 mA h g −1 at a current rate of 40 C, and it retained nearly 100 % of its capacity after 100 cycles. A self-assembly mechanism of the mixed surfactant was highlighted to explain the formation of hierarchical microspheres. The physical and electrochemical properties of obtained material were correlated effectively.
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Materials Research Express
·
2019
·Vol. 6
·期 10
·105014
·
IF 1.449
Jianchao Zhang,Lingyun Li,Rongrong Shi,Jiaming Mei,Zhang Xiao,Wei Ma
A convenient and efficient approach for the synthesis of Fe3O4@TiO2 nanocomposites with core-shell structure has been demonstrated. It takes four steps for synthesis process. Oleic acid-coated monodisperse Fe3O4 nanoparticles are obtained firstly, and surface modified Fe3O4 nanoparticles are followed to proceed. Then Fe3O4@TiO2 core-shell nanocomposites are subsequently synthesized using tetrabutyl titanate (TBOT) as titanium source and some polar aprotic solvents used as the mixed solvents. The obtained core-shell structure is composed of a central Fe3O4 nanoparticle core with sequential TiO2 surface, whereas the outer TiO2 coating was useful for the degradation of organic contaminants. Different core-shell nanocomposites in different polar solution are obtained. Shell thickness of Fe3O4@TiO2 nanocomposites could be adjusted rationally by changing synthetic conditions. The measurements of the magnetic properties demonstrate that the Fe3O4@TiO2 core-shell nanocomposites exhibit magnetic behavior at room temperature. The degradation of methylene blue solution was also explored.
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