JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 5
·3613-3628
·
IF 4.682
Guo Zijiao,Li Yue,Lu Zan,Chao Yunfeng,Liu Wei
Abstract As interest in smart textiles grows, fiber-based supercapacitors are gaining attention as promising devices for powering wearable electronics. Herein, we have demonstrated a two-step manufactured hybrid fiber with excellent energy storage properties. Anhydrous MXene (Ti 3 C 2 T x ) sheets are primarily spun in synergy with liquid crystal carbon nanotubes (CNTs) to produce a continuous fiber as a promising electrode material, which solves the problem of poor rate capability owing to the sheet re-stacking of MXene. MnO 2 @MXene/CNT fibers are subsequently prepared by electrochemical deposition with controlled time. The optimal content of MXene (10 wt%) and a perfect thickness of the MnO 2 layer (4 μm) are testified to achieve an excellent capacitance of 371.1 F cm −3 in three-electrode system, which is about 200% and 1800% higher than that of 10 wt%-MXene/CNT and CNT fiber electrode, respectively. Symmetric fiber supercapacitor is assembled by paralleling two fibers with LiCl/PVA gel electrolyte, manifesting a superior cycling stability of 86.3% after 10000 cycles. Graphical Abstract Anhydrous MXene nanosheets and CNTs are incorporated by a high yield spinning technique to prepare continuous hybrid fibers as a conductive framework for MnO2 deposition, exhibiting stable and outstanding energy storage properties in supercapacitor.
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CHEMICAL PAPERS
·
2017
·Vol. 72
·期 1
·51-56
·
IF 1.258
Wei Mengyi,Qian Chao,Chen Xinzhi
Based on the recycling of NO
x
, the Cu(I)- and HNO 3 -catalyzed oxidation of 2-chloro-4-(methylsulfonyl)toluene to 2-chloro-4-(methylsulfonyl)benzoic acid has been developed with an excellent yield of 84.2% and a purity of 99.7%. The optimized reaction conditions (160 °C, oxygen pressure 1.5 MPa, HNO 3 concentration 25 wt%, HNO 3 : substrate 0.5:1) use 1.0 mol% CuI as catalyst. The dosage of HNO 3 in the new process is only 25% of the stoichiometric amount and 12.5% of the amount of the traditional process. The NO
x
emission is 5% amount of the traditional process. The oxidation of several additional toluene derivatives with comparable yields demonstrates the generality to these reaction conditions.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2016
·Vol. 18
·期 9
·1-11
·
IF 2.101
Feng Lu,Jiang Heng,Zou Mingming,Xiong Fengqiang,Ganeshraja Ayyakannu Sundaram,Pervaiz Erum,Liu Yinan,Zou Shunying,Yang Minghui
Abstract Manganese- and nitrogen-co-doped mesoporous TiO 2 microsphere photocatalysts are prepared by a simple sol–gel method with controllable sizes in the range of 400–500 nm and high surface area of 112 m 2 g −1 . Manganous acetate is the Mn source, and ammonia gas is the nitrogen source used. The dopants are found to be uniformly distributed in the TiO 2 matrix. Interestingly, in (Mn,N)-co-doped TiO 2 , we observe an effective indirect band gap of ~2.58 eV. (Mn,N)-co-doped mesoporous TiO 2 microspheres show higher photocatalytic activity than Mn–TiO 2 microspheres under visible light irradiation. Among the samples reported in this work, 0.2 at.% Mn doping and 500 °C 2-h nitriding condition give the highest photocatalytic activity. The observed photocatalytic activity in the (Mn,N)-co-doped TiO 2 is attributed to the contribution from improved absorption due to trap levels of Mn, oxygen vacancies and N doping. Graphical Abstract Manganese- and nitrogen-co-doped mesoporous TiO 2 microspheres containing substitutional N, interstitial N and O vacancies show high visible light photocatalytic activity.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 17
·14167-14177
·
IF 2.779
Zheng YaQian,Hou YaFei,Tan YiNa,Lin Qian,Du Peng,Luo LaiHui,Li WeiPing
Interfacial polarizations might provide important contributions to increase the dielectric constant/polarization of polymer-based nanocomposites, however, with the enhanced interfacial polarization, the insulation (interfacial barriers) and charge–discharge energy efficiency of nanocomposites might be greatly reduced. Therefore, how to balance the coupling effects of interfacial polarizations and interfacial barriers needs to be systematically investigated for optimizing the energy storage performances of nanocomposites. In this study, hierarchical x wt% BT@ST nanofibers with various weight fraction of BaTiO 3 nanoparticles are designed and prepared. Through regulating the weight fraction of BaTiO 3 nanoparticles, the coupling effects of internal interfacial polarizations and interfacial barriers have been explored and optimized, achieving an excellent energy storage performance. For example, the 2 wt% BT@ST/P(VDF-HFP) nanocomposite provides the highest discharged energy density of 17.4 J/cm 3 and charge–discharge energy efficiency of 66% at 453 MV/m due to the simultaneously improved polarization and breakdown strength. The regulation of internal interfacial polarizations and interfacial barriers of hierarchical fillers provide a new approach to design and prepare polymer-based nanocomposites with satisfactory energy storage performances at low filler fraction.
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Journal of Inorganic and Organometallic Polymers and Materials
·
2021
·Vol. 31
·期 3
·1231-1240
·
IF 3.543
Chen Ding,Cao Yucheng,Chen Nini,Feng Pengfei
The cobalt metal–organic frameworks (Co-MOFs) were efficiently prepared by ultrasonic-assisted ball milling with low cost, utilizing 1, 3, 5-benzenetricarboxylic acid and cobalt (II) acetate tetrahydrate. The structural characteristics were carried out by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetry (TGA), and BET surface areas method. The adsorption of Co-MOFs to Congo Red (CR) was analyzed by Langmuir adsorption isotherm and pseudo-second-order kinetic model. The results showed that the maximum adsorption performance (fitted by Langmuir adsorption isotherm) of the Co-MOFs (with 30 min’s synthesis time and 1:1 molar ratio of the raw material) to CR reached 1.76 × 10 3 mg/g, which is much higher than previous reports. The adsorption experiment reached equilibrium in 30 min. Electrostatic attractions, π–π stacking interactions and pH are considered to play a significant role in the adsorption of Co-MOFs to CR. The adsorption rate of Co-MOFs to CR remains 34% even after it is recycled for the third time. In this paper, the absorption results indicated that Co-MOFs prepared by ultrasonic-assisted ball milling presents a great prospect in the field of CR adsorption.
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TRIBOLOGY LETTERS
·
2022
·Vol. 70
·期 4
·1-11
·
IF 3.327
Liu Sisi,Deng Yuxing,Sun He,Jiang Shengqiang,Liu Jingang
A modified carbon nanotube composite film was designed and prepared by self-assembled molecular film technology. The carbon nanotubes modified by 3-glycidoxypropyltrimethoxy-silane (KH560) were grafted onto a silicon substrate by using N-3-(trimethoxysilyl)propylethyl-enediamine (DA) molecules as an intermediate connecting layer. Compared with the silicon surface, the surface wettability of the modified carbon nanotube composite thin film changes from super-hydrophilic to hydrophobic. At the nanoscale, the surface adhesion and friction forces decreased by nearly 91% and 87%, respectively, and at the microscale, the friction coefficient was reduced by 84%. The anti-wear lifetime is prolonged to 72 min under an applied load of 1 N, which is over 35 times longer than that of silicon. Due to the great wear-resistant properties of modified carbon nanotubes, they are expected to be widely used in micro/nanoelectromechanical systems.
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Nanoscale Research Letters
·
2021
·Vol. 16
·期 1
·1-12
·
IF 4.703
Ma Xiao Li,Fei Guang Tao,Xu Shao Hui
Abstract In this study, polyaniline (PANI) is prepared by means of chemical oxidization polymerization and directly loaded on the modified fiber ball (m-FB) to obtain macroscale polyaniline/modified fiber ball (PANI/m-FB) composite, and then its removal ability of Cr(VI) is investigated. The effects of different parameters such as contact time, pH value and initial concentration on Cr(VI) removal efficiency are discussed. The experimental results illustrate that the favorable pH value is 5.0 and the maximum removal capacity is measured to be 293.13 mg g −1 . Besides, PANI/m-FB composites can be regenerated and reused after being treated with strong acid. The kinetic study indicates that the adsorption procedure is mainly controlled by chemical adsorption. More importantly, the macroscale of composites can avoid secondary pollution efficiently. Benefiting from the low cost, easy preparation in large scale, environmentally friendly, excellent recycling performance as well as high removal ability, PANI/m-FB composites exhibit a potential possibility to remove Cr(VI) from industrial waste water. Graphic Abstract The polyaniline (PANI) was coated on modified fiber ball (m-FB) to remove Cr(VI) in waste water, and this kind of PANI/m-FB composites can avoid secondary pollution efficiently due to its macrostructure. Furthermore, the removal capacity can reach to 291.13 mg/g and can be multiple reused.
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Journal of Coatings Technology and Research
·
2021
·Vol. 18
·期 4
·1065-1073
·
IF 2.382
Liu Haitao,Cao Hailin,Huang Yudong,Shao Pengcong,Yan Yiwu
An ambient-curable hybrid resin (ACHR) terminated with trimethoxysilane functional groups, synthesized through a simple ring-opening reaction between 3-glycidyloxypropyltrimethoxysilane (KH560) and 4,4′-methylenebis (cyclohexylamine) (PACM), was applied to the surface of a transparent organic polymer to produce a robust, flexible, and transparent protective hybrid film, moisture cured at room temperature. The structure, morphology, and optical, mechanical, and thermal properties of the obtained hybrid film were evaluated. The hybrid film allowed the transmittance of more than 87% of visible light (at 600 nm), maintaining almost the same high transparency as bare PET film. The unique flexible segments and rigid segments in the inorganic–organic hybrid structure of the film realized superior resistance to bending and scratching. The hybrid film-coated PET demonstrated excellent flexibility, with an extremely low bending radius, illustrated by wrapping around a 1-mm mandrel bar without cracking. In addition, the hybrid film exhibited superior pencil hardness (of 2H) and excellent wear durability, i.e., no scratching after being subjected to 200 abrasion cycles using #0000 steel wool under a 19.6 kPa load. The robust, flexible, and transparent protective film developed here, and its simple and efficient preparation method, should have extensive application prospects.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 24
·28605-28617
·
IF 2.478
Wang Zexing,Guo Biao,Xu Dong,Li Jiamao
We report a successful fabrication of 0.6Ca 0.61 Nd 0.26 TiO 3 –0.4Nd(Zn 0.5 Ti 0.5 )O 3 (hereinafter abbreviated as 6CNT–4NCT) microwave ceramics with good sintering activity and desired dielectric properties from EDTA-gel combustion synthesized powders in this paper. The as-synthesized nanopowders have been characterized by X–ray diffraction (XRD), Fourier transformation infrared (FT–IR), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) techniques, respectively. The sintering behavior and dielectric performance have been evaluated on the sintered ceramics. The as-obtained product with amorphous structure could be directly crystallized and produced pure 6CNT–4NCT solid solution phase with orthorhombic perovskite structure at a relatively low temperature of 700 °C, without formation of any intermediate phase. TEM images revealed that homogeneous and well dispersed spherical-shaped nanostructure with an average particle size of 23.8 nm was formed at 800 °C. Well-dense 6CNT–4NCT bulk ceramics with 98.8% relative density were obtained at a relatively low sintering temperature of 1225 °C due to high sintering activity of nanopowders. Moreover, the bulk ceramics exhibited a higher quality factor ( Q × f ) value than those prepared via the conventional solid-state reaction method. Desired microwave dielectric properties were achieved at 1200 °C: dielectric constant ε r = 57.2, Q × f = 59,360 GHz, and temperature coefficient of resonant frequency τ f = + 1.95 ppm/°C. This study indicates that the EDTA-gel combustion route is a convenient, low-cost, and interesting route to fabricate high-quality microwave ceramics for practical applications.
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Science China-Materials
·
2021
·Vol. 64
·期 10
·2421-2429
·
IF 8.273
Zhou Ziren,Qiao Hong Wei,Li Xiaolong,Lin Chen,Xie Jin,Shi Yiheng,Lin Zeqing,Ge Bing,Chen Mengjiong,Jin Yi Zheng,Yang Shuang,Hou Yu,Yang Hua Gui
Inorganic perovskite absorbers are promising candidates for next-generation photovoltaics due to their good thermal and light stabilities. Halide-mixed CsPbI x Br 3 − x reach a compromise between its structural tolerance and absorption edge, yet the power conversion efficiencies (PCEs) of the asfabricated cells can be considerably limited by the nonideal quality of solution-processed films. Here we demonstrated a fumigation strategy on colloidal perovskite films using dual- O -donor ethyl acetate (EA). By in-situ monitoring this stage with grazing-incidence wide-angle X-ray scattering technology, we reveal that EA fumigation would impose ripening barrier on colloidal inorganic perovskites and hence slow down the nucleation rate, leading to an intermediate state for processing high-crystallinity and oriented perovskite films with improved photophysical properties. An optimized PCE of 16.6% was finally yielded upon wide-bandgap (1.9 eV) perovskite absorber.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2022
·Vol. 26
·期 11
·2585-2593
·
IF 2.747
Sun Wanzhou,Xu Lu,Zhu Aiping
In this paper, nanocarbon-isolated nano-sheet silicon(Si) electrode Si@CNT/C has been developed by pyrolysis of the compound of Si and polyaniline (PANI)/CNT nanocomposite. The results suggest that CNT content in electrode plays a decisive role in the specific capacity, rate capability, and long-term cycle stability of the battery. Si@CNT(M)/C/graphite(G) electrode with high (10.8wt%) CNT content demonstrates the specific capacity of 1201 mAh·g −1 at 100 mA·g −1 current density, which is much better than 491 mAh·g −1 for the Si@CNT(S)/C/G with low (1.3wt%) CNT content. After 500 cycles, the Si@CNT(M)/C/G electrode still remains 700 mAh·g −1 specific capacity, while the Si@CNT(S)/C/G electrode decreases to 200 mAh·g −1 . This is caused by CNT conductive network in the electrode, which can maintain not only the structural stability of the Si but also the conductivity throughout the cell cycles.
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JOURNAL OF THERMAL SPRAY TECHNOLOGY
·
2024
·Vol. 33
·期 5
·1694-1708
·
IF 3.2
Zhang Lu-lu,Ma Wen-chao,Liu Yan-cai,Cao Hong-wei,An Ya-qiong,Huang Hai-fan,Zhang Hao-lin,Qiao Jiang-hao,Li Xiao-wei,Liu Hong-tao
In this paper, as-received Zn powder and as-prepared Zn@(ZnWO 4 /ZnO) core–shell powder were used as feedstocks for plasma spraying to prepare Zn-based composite coatings and nano-ZnO was co-deposited by chemical vapor deposition induced by plasma spraying. The composition and morphology were controllable within certain range by plasma spraying power. The photocatalytic activities of the coatings were analyzed by the degradation efficiency of methyl orange (MO) solution. It was found the photocatalytic activity can be improved with ZnWO 4 decoration. The Zn/ZnO/ZnWO 4 coating which presented tremella-like surface morphology was testified to have the best photocatalytic activity under UV light irradiation among all coatings. On the other hand, the chemical surface modification with 1H,1H,1H,2H-perfluorodecyltriethoxysilane (FAS-17) was implemented to produce superhydrophobic coatings. Among all modified coatings, the ZnWO 4 -containing coating with tremella-like surface structure presented the best superhydrophobicity. By the cyclic wetting and tape adhesion experiments, the tremella-like structure was proved to make a great improvement on the robustness of the Zn-based superhydrophobic coatings. The superhydrophobic and photocatalytic properties provide the possibility for the application of the coating in the fields of antifouling, antibacterial, and photocatalytic degradation of organics. Graphical Abstract
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