JOURNAL OF ALLOYS AND COMPOUNDS
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2018
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IF 3.779
Xinhua Li,Xin Wen,Huanhuan Zhao,Zongqing Ma,Liming Yu,Chong Li,Chenxi Liu,Qianying Guo,Yongchang Liu
The microstructure and phase evolution in Nb-Al system during MA are systemically studied. The existence of Nb-Al amorphous layer surrounding Nb nano-grains after short-time ball milling was confirmed by the HRTEM observation as well as the crystallization behavior in the annealing experiment. It was also found that after short time milling, only very little Al can enter the crystal lattice of Nb and substitute for Nb, whereas most of Al mainly concentrate in this amorphous layer surrounding Nb nano-grains. What's more, interface thermodynamic analysis and calculation were employed to investigate the phase formation and evolution of this amorphous layer in Nb-Al binary system during MA process. Accordingly, positive driving force (≡-ΔG) definitely exists for the formation of the amorphous layer {NbAl} surrounding Nb nano-grains. Thus, these amorphous layers can form and exist stably in the short-time milled Nb-Al system. With the milling time prolonging, this amorphous layer becomes unstable and can crystallize into Nb(Al) ss solid solution when its thickness increases beyond a critical thickness. The critical thickness of this amorphous layer is also predicted by the interface thermodynamics calculation and the corresponding calculated value (approximately 1.9 nm) is consistent with the observed thickness (about 2.2 nm) by the HRTEM within the error range. More importantly, the solubility of Al in the lattice of Nb can be significantly increased resulting from the crystallization of this amorphous layer {NbAl}. Our work provides a new and rational perspective to well understand the complicated microstructure and phase evolution in various nano-sized systems during MA process.
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高影响因子
INTEGRATED FERROELECTRICS
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2018
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IF 0.367
Tao Yan,Hui Ren,Qingjie Jiao,Lan Yu,Yaru Li
Nano-aluminum/nitrocellulose microspheres were fabricated using electrospray technique. Effects of solvent composition, nitrocellulose content and precursor concentration on the morphology and size distribution of the microspheres were investigated. The modified materials parameters were selected to generate RDX/nano-aluminum/nitrocellulose core-shell microspheres by electrospray with a coaxial needle. The morphology of core-shell microsphere was dependent on the relative ratio between the inner and outer flow rate as well as the applied voltage. For a system with a constant inner flow rate, there is an optimal range for the outer flow rate and the applied voltage.
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高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 33
·16196-16204
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IF 9.931
Jianqiu Zhao,Yawei Yang,Chenhui Yang,Yapeng Tian,Yan Han,Jie Liu,Xingtian Yin,Wenxiu Que
Solar steam generation is a renewable, environmentally friendly and low-cost technology for seawater desalination and wastewater remediation. Highly efficient solar evaporation from pure water has been achieved using advanced artificial architectures and hydrophilic light absorption materials, while the long-term steady work for high salinity water desalination becomes a non-negligible problem when it comes to practical use. In terms of this issue, a hydrophobic MXene membrane, which contains a salt-blocking delaminated Ti3C2 nanosheet layer with trimethoxy(1H,1H,2H,2H-perfluorodecyl)silane modification for sunlight harvesting and a piece of commercial filter membrane for water supply, is proposed in this work. With high light utilization, high stability, abundant evaporating channels, rapid water transport through the filter membrane and salt-blocking on the MXene membrane, the as-fabricated self-floatable device achieves a solar evaporation rate of 1.31 kg m−2 h−1 and a solar steam conversion efficiency of 71%, and stability under high salinity conditions under one sun over 200 hours, ensuring the highly efficient and long-term stable photothermal transduction for water purification from seawater and wastewater containing organic dyes and heavy metals. The hydrophobic surface enabled salt-blocking MXene membrane is proved to be an effective, efficient and stable photothermal material for solar desalination.
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高影响因子
CHEMISTRY OF MATERIALS
·
2018
·
IF 9.89
Zhen Ge,Honghui Chen,Yuxin Ren,Peishuang Xiao,Yang Yang,Tengfei Zhang,Yanfeng Ma,Yongsheng Chen
Inorganic porous materials have found a great many applications in fields such as filtration, catalysis, and so forth. However, most of these materials have been prepared using complicated template and foaming methods and furthermore in many cases suffer from low electrical and thermal conductivity. Herein, we developed a universal and simple method for the synthesis of dual network reduced graphene oxide–ceramic/metal foam materials from commercial powders directly with graphene oxide as a 2D dispersant following a two-step process (solvothermal and partial sintering). This approach leads to the formation of a three-dimensional and interpenetrating dual network of both reduced graphene oxide and inorganic material. Importantly, this method not only is rather scalable but can also be applied universally for various ceramic materials, such as Al2O3 and TiO2, and even metals such as Al and Cu. Furthermore, the material’s porosity can be controlled by varying sintering temperatures and using different sizes of starting materials, ranging from several nanometers to a dozen micrometers. Because of the dual network architecture of both reduced graphene oxide and inorganic components, these materials exhibit multiple functions such as high porosity, improved electrical conductivity, and so forth. These results thus offer a general platform from various commercial inorganic powder materials directly for preparing porous but mechanically stable bulk materials, which are in high demand for catalysis, filtration, conductive ceramic, and porous electrode materials.
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高影响因子
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN
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2018
·Vol. 126
·期 11
·900-905
·
IF 0.887
Shuai LU,Xiaoqiang LI,Youfu ZHOU,Wentao XU,Junrong LING,Wei PAN
TiB2/Ti2AlN composites with different proportions were successfully fabricated through solid state reaction of Ti/Al/AlN/BN powders and subsequent hot pressing sintering. The reaction mechanism, microstructures and mechanical properties of the composites were investigated. The Vickers hardness of the samples ascended with increases in the TiB2 content and reached the highest value of 11.32 ± 0.12 GPa at a TiB2/Ti2AlN mole ratio of 1:2 (M2T1). TiB2/Ti2AlN composites with a mole ratio of 1:3 (M3T1) and 1:4 (M4T1) exhibited the maximum flexural strength of 497 ± 15 MPa and the highest fracture toughness of 9.52 ± 0.14 MPa·m1/2, respectively, which are 1.3 times and 1.8 times that of pure Ti2AlN (MT0) ceramic.
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高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Ruixiang Deng,Bingbing Chen,Haogeng Li,Ke Zhang,Tao Zhang,Yun Yu,Lixin Song
Microwave absorbers serve the purpose to ensure the transmission efficiency and accuracy in 5G telecommunications. Two-dimensional MXene has great potential in absorbing microwave. In this study, MXene(Ti 3 C 2 T x )/Co 3 O 4 composites are successfully fabricated by a facile and stable hydrothermal treatment in concentrated strong base and Argon environment, followed by a one-step annealing process. Phase composition , chemical state of elements, morphology and structure of the new composite materials are studied by systematical characterization. It is revealed that adsorbed Na + ions and terminations, which are generated at the interface during hydrothermal treatment in concentrated NaOH solution, can protect the Ti 3 C 2 T x from being decomposed. The synthesis mechanism is also proposed for stable fabrication of other MXene-based composite materials. The MXene/Co 3 O 4 composite is able to perform single-band absorption, multiband absorption and even broadband absorption in 2–18 GHz band by tuning its composition and thickness. Particularly, better than 90% absorption in a wide range of 10.8–17 GHz can be achieved with a thickness of just 2 mm. Enhanced wideband absorption originates from the multilayer structure , the surface defects , the conductivity of Ti 3 C 2 T x and the capacitance structure of Co 3 O 4 . Ultrathin and broadband high absorption features make the material a promising candidate for future application.
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高影响因子
IONICS
·
2019
·Vol. 25
·期 10
·4739-4749
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IF 2.289
Han Tao,Han Jia-Jun,Ma Hui,Zhang Ning,Sun Dan-Dan
Graphene oxide (GO) was synthesized by the modified Hummers method and then reduced with NaBH 4 to form RGO with a regular layered structure. The graphene oxide is benzenesulfonated to obtain a functionalized graphene material (RGO-BS). The benzenesulfonated polyaniline/RGO composite (PANI/RGO-BS) was prepared by adsorption double oxidation method using RGO as template. Some physical characterization methods (X-ray diffraction, Fourier-transform infrared spectroscopy, and scanning electron microscopy) were used to analyze the morphology and crystallinity of the composite. The electrochemical properties were characterized by cyclic voltammetry, impedance spectroscopy, galvanostatic charge/discharge, and rate capability. The initial discharge specific capacities of oxidized PANI/RGO-BS and reduced PANI/RGO-BS were 165.4 and 176 mAh/g. After 100 cycles, the capacity retention rates were 92.6% and 96%, the coulombic efficiency of the battery is close to 100%. These results indicate functionalized composite has exciting potentials for the cathode material of lithium-ion battery.
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2019
·Vol. 43
·期 22
·8613-8619
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IF 3.069
Zizheng Ai,Bin Chang,Chengwei Xu,Baibiao Huang,Yongzhong Wu,Xiaopeng Hao,Yongliang Shao
Electrocatalysts with the advantages of stability, high efficiency, and noble-metal-free features are in urgent need for water splitting. Herein, for the first time, based on the interface engineering, a novel BNNS@Ti3C2 intercalation electrocatalyst was prepared via a controllable synthesis strategy. The rich active sites of Ti3C2 were better protected as well as were able to serve as a bridge to connect the different layers of BNNS. Furthermore, combining the first-principles calculations, the nature of the interface proved the transformation from semiconducting properties to metallicity in this unique intercalation structure. The as-obtained composite possessed improved conductivity and abundant catalytic active sites, exhibiting a low onset potential of 23 mV and overpotential of 52 mV (vs. RHE) at 10 mA cm−2 with outstanding stability. BNNS@Ti3C2 was used as an electrocatalyst for the first time without noble-metal assistance. This study demonstrates that the layered materials can serve as a promising electrocatalyst by interfacing with the intercalation structure.
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高影响因子
RSC Advances
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2018
·Vol. 8
·期 69
·39742-39748
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IF 2.936
Jinfeng Yan,Yanan Ma,Chuankun Zhang,Xingxing Li,Weizhi Liu,Xinyu Yao,Shuai Yao,Shijun Luo
Recently, more and more researchers have devoted their efforts to developing flexible electrochemical energy storage devices to meet the development of portable and wearable electronics. Among them, supercapacitors (SCs) have been widely studied due to their high specific capacitance and power density. However, most flexible SCs often use traditional carbon materials and transition metal oxides as electrode materials. In this paper, we used an easy and low-cost way to fabricate a flexible supercapacitor based on a new type of two-dimensional material, transition metal carbides, nitrides, or carbonitrides (MXenes). By taking full advantage of the hydrophilicity and metal conductivity of MXene nanosheets, an extremely simple “dipping and drying” method was used to achieve conductive textile electrodes with a specific capacitance of 182.70 F g−1, which is higher than reported for carbon nanotubes (CNTs) and active carbon. To further improve the capacitive performance of the MXene-based electrode and avoid the poor oxygen oxidation of MXene, polypyrrole (PPy) was electrochemically deposited on the surface of MXene textiles, thus producing a PPy–MXene coated textile electrode with a specific capacitance of 343.20 F g−1. In addition, a symmetrical solid-state supercapacitor based on MXene–PPy textiles was assembled, which achieved an energy density of 1.30 mW h g−1 (power density = 41.1 mW g−1). This work introduces a new type of MXene-based textile SC, which provides a promising candidate for flexible and wearable energy storage devices.
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PubMed
高影响因子
ANALYTICA CHIMICA ACTA
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2018
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IF 5.123
Yang Li,Qingfen Niu,Tao Wei,Tianduo Li
A novel bifunctional thiophene-based Schiff base TS as a colorimetric and fluorescent turn-on sensor for rapid and simultaneous detection of Al 3+ and Zn 2+ ions with high selectivity and sensitivity has been developed. The sensor shows remarkable fluorescence enhancement response for Al 3+ and Zn 2+ over a broad pH range with good anti-interference capability, which accompanied with an obvious color change easily detected by naked eyes. Sensor TS can detect as low as 3.7 × 10 −9 M for Al 3+ and 3.0 × 10 −8 M for Zn 2+ , whereas respective association constants are 1.16 × 10 4 M −1 and 2.08 × 10 4 M −1 . With the help of fluorescence titration and Job's plot, the stoichiometric ratio of TS with Al 3+ /Zn 2+ was determined to be 1:1. The sensing mechanism of sensor TS with Al 3+ /Zn 2+ based on the chelation-enhanced fluorescence (CHEF) was analyzed in detail through 1 H NMR titration, FTIR, HRMS and DFT studies . Moreover, sensor TS has been applied to the detection of Al 3+ and Zn 2+ in real environmental water and food samples as well as the filter paper-based test strips. Furthermore, sensor TS has good cell-permeability and can be used to selectively sense intracellular Al 3+ and Zn 2+ by bioimaging.
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PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2018
·
IF 2.829
Yaqian Dan,Chengquan Zhong,Huanwen Zhu,Jun Wang
For surface-enhanced Raman spectroscopy (SERS) substrates, complexity of the fabrication process, sensitivity and stability are factors that need to be considered. We report a simple and novel method for preparing an effective substrate that greatly enhances SERS signals. The SERS substrate is fabricated by selectively electroless deposition of Ag nanoparticles in the highly ordered porous anodized aluminum oxide (AAO) template and then etching it to form Ag nanorod bundles structure, so that the Raman enhancement occurs in the gap between the nanorods and the top of the nanorod bundle, which is verified by finite element analysis . A peculiarity of this method is that this is the first time to synthesize Ag nanorod arrays structure by using it. The results indicated that this prepared substrate has special micro-nano structure and when rhodamine 6 G is selected as the detection reagent, the detection limit is as low as 10 −16 M with excellent recyclability. This outstanding array structure has a promising practical application in SERS field.
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高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Yajing Wang,Jiankang Wang,Guokang Han,Chunyu Du,Qihuang Deng,Yunzhi Gao,Geping Yin,Ying Song
Carbon support used in commercial Pt/C commonly suffers from corrosion under harsh electrooxidation environment endowed by anodic potential. An alternative support with superior electric conductivity and stable structure should be developed. Herein, Ti 3 C 2 MXene was synthesized as support to immobilize Pt nanoparticles due to its fascinating stable layered structure, and metallic property. Used as electrocatalyst for methanol oxidation reaction (MOR) and hydrogen evolution reaction (HER) for the first time, as-prepared Pt/Ti 3 C 2 MXene showed much enhanced electrocatalytic activity for methanol oxidation, as unraveled by its peak current density of 1.137 mA/cm 2 , nearly three times larger than that of Pt/C (0.388 mA/cm 2 ). Moreover, it also exhibited long-term stability even running for 2 h. In addition, Pt/Ti 3 C 2 MXene was able to catalyze electrochemical hydrogen evolution reaction (HER) in 0.5 M H 2 SO 4 solution with only 7 mV overpotential at − 10 mA/cm 2 , obviously lower than that of Pt/C (17 mV). The improved MOR and HER activity of Pt/Ti 3 C 2 MXene could be assigned to the unique stable 2D nanosheet structure, excellent electric conductivity, strong binding strength as well as electronic effect between Pt and Ti 3 C 2 MXene. This work widens the application of Ti 3 C 2 MXene in the field of methanol oxidation and hydrogen evolution reaction.
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高影响因子
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