Journal of Advanced Ceramics
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2022
·Vol. 11
·期 9
·1491-1497
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IF 11.534
Liu Yi,Wang Chuangye,Luo Wei,Bai Liang,Xu Yang,Hao Xiaodong,Zhu Jianfeng,Guo Shouwu
The microstructure and morphology of Ti 3 AlC 2 powders not only affect the preparation of Ti 3 C 2 MXene but also have a great influence on their potential applications, such as microwave absorbers, alloy additives, or catalytic supports. However, the synthesis of Ti 3 AlC 2 powders with desired microstructure and morphology remains a challenge. Herein, hollow Ti 3 AlC 2 microrods were prepared for the first time in NaCl/KCl molten salts by using titanium, aluminum, and short carbon fibers as starting materials. It was found that the short carbon fibers not only performed as carbon source but also acted as sacrificial template. Furthermore, it was revealed that TiC and Ti 2 AlC were initially formed on the surface of carbon fibers. The subsequent reactions between the outer Ti, Al and the inner carbon were dominated by the Kirkendall effect which gave rise to the formation of a hollow structure. Based on this mechanism, hollow Ti 3 AlC 2 microspheres and a series of hollow TiC, Ti 2 AlC, and V 2 AlC powders were also successfully fabricated. This work provides a facile route to synthesize hollow MAX phases and may give enlightenment on preparing other hollow carbide powders via the Kirkendall effect in the molten salts.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 4
·1823
·
IF 4.6
Jingjie Lv,Haibo Ren,Ziyan Cheng,Sang Woo Joo,Jiarui Huang
To solve the slow kinetics of polysulfide conversion reaction in Li-S battery, many transition metal nitrides were developed for sulfur hosts. Herein, novel polyaniline-coated porous vanadium nitride (VN) microrods were synthesized via a calcination, washing and polyaniline-coating process, which served as sulfur host for Li-S battery exhibited high electrochemical performance. The porous VN microrods with high specific surface area provided enough interspace to overcome the volume change of the cathode. The outer layer of polyaniline as a conductive shell enhanced the cathode conductivity, effectively blocked the shuttle effect of polysulfides, thus improving the cycling capacity of Li-S battery. The cathode exhibited an initial capacity of 1007 mAh g−1at 0.5 A g−1, and the reversible capacity remained at 735 mAh g−1over 150 cycles.Keywords:VN;microrods;sulfur host;cathode;lithium–sulfur battery
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBON
·
2019
·
IF 7.466
Fuming Wu,Jianping Gao,Xiangang Zhai,Minhui Xie,Yu Sun,Huiying Kang,Qiang Tian,Haixia Qiu
In this work, we report the successful synthesis of hierarchical porous carbon microrods via a one-step pyrolysis and activation treatment at different temperatures. The optimized porous carbon microrods have many advantages, including high specific area (2757.63 m 2 g −1 ) with a total pore volume (1.47 cm 3 g −1 ), high self-doping N contents, and unique porous microrod structure. As a result, the optimized porous carbon microrods show a fairly high specific capacitance of 406 F g −1 at 0.5 A g −1 (335 F g −1 at 10 A g −1 ) in 6 M KOH electrolyte and a good rate capability of 86.1%. Furthermore, the symmetric supercapacitor of porous carbon. microrods with 1 M Na 2 SO 4 electrolyte exhibits a high energy density of 26.3 W h kg −1 at a power density of 429 W kg −1 . The symmetric supercapacitor also shows excellent cycle ability with a capacitance retention of 94% over 10,000 cycles. This study provides a valuable approach for preparation of electrode materials for energy storage systems by using abundant biomass.
研究领域:
材料科学
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能源存储
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生物质利用
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2015
·
IF 2.605
Jie Chen,Ye Sheng,Xiuqing Zhou,Fei Gao,Chunming Lin,Zhan Shi,Xuechun Xu,Haifeng Zou
SiO 2 and Eu 3+ -doped SiO 2 submicron rods were conveniently fabricated via a sol–gel process at room temperature. In this process, citric acid served as a unique structural modifier through hydrolysis of TEOS at alkaline condition to obtain the silica submicron rods. The morphology of the products was sensitive to the conditions, such as stirring, gelation time and the dropping speed of NH 4 OH. By sampling the products at different reaction times, we discussed the formation and growing mechanism of SiO 2 :Eu 3+ submicron rods in detail. The weak interactions between ammonium citrate crystals and silica species may be the reasons of the rods formation. The obtained silica submicron rods were 5–6 μm in length and 650–750 nm in width and there was no obvious change after doping. Under UV light excitation, the undoped silica submicron rods exhibited blue emission, which may be associated with defect centers in the structures of the products. The Eu 3+ -doped silica submicron rods exhibited red emission, which was due to the 4f→4f transition of Eu 3+ . The effect of different doping concentrations of Eu 3+ ions on the luminescence was investigated. The samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectrum (FT-IR), Thermo-gravimetry Analysis (TGA), Scanning electron microscope (SEM), Transmission electron microscope (TEM), Energy-dispersive spectroscopy (EDS) and Photoluminescence spectrum.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Nanomaterials
·
2018
·
IF 2.207
Zhenguang Shen,Zengying Zhao,Jian Wen,Jingwen Qian,Zhijian Peng,Xiuli Fu
Tungsten oxide (WO3−x) crystalline nano/microrods with identical morphology but different contents of oxygen vacancies were prepared by thermally evaporating fixed amount of WO3 powder in reductive atmosphere from different amounts of S power at 1150°C in a vacuum tube furnace, in which both sources were loaded in separate ceramic boat. With increasing amount of S powder, a series of tungsten oxides, WO3, WO2.90, W19O55 (WO2.89), and W18O49 (WO2.72), could be obtained. And devices were fabricated by screen-printing the obtained WO3−x crystals on ceramic substrates with Ag-Pd interdigital electrodes. With increasing content of oxygen vacancies, the devices fabricated with WO3−x crystals present a negative to positive resistance response to relative humidity. Under dry atmosphere, for the devices with increasing , the strong response to light changed from short to long wavelength; under light irradiation, the conducting ability of the devices was enhanced, due to the more efficient separation and transportation of the photogenerated carriers; and under simulated solar irradiation, the photocurrent intensity of the W18O49 device was roughly 8 times, about 500 times, and even 1000 times larger than that of the W19O55, WO2.90, and WO3 one, respectively. With the versatile optoelectrochemical properties, the obtained WO3−x crystals have the great potential to prepare various humidity sensors and optoelectrical devices.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
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2023
·
IF 6.4
Bo Dong,Chengji Deng,Jinghui Di,Jun Ding,Qingyou Zhu,Hao Liu,Hongxi Zhu,Chao Yu
The non-isothermal and isothermal oxidation behavior of Al 3 BC 3 powders at 800–1400 °C in the air was studied. The results revealed that the oxidation resistance of Al 3 BC 3 powders was better than that of “Al 8 B 4 C 7 ” powders. At 800–1100 °C, the sintering accelerated the adhesion between the aluminum borate layer and the Al 3 BC 3 core. No micro-crack was observed on both surface and cross-section, thus effectively blocking the diffusion of oxygen and volatilization of reactant gases. The oxidation behavior changed due to the oxidation products growing into a rod shape higher than 1200 °C. The interlocking structure of Al 18 B 4 O 33 micro-rods made the surface of oxidized powder porous. Therefore, the oxygen diffused quickly into Al 3 BC 3 through the porous structure on its surface, leading to rapid oxidation. Jander model could deal with oxidation kinetics and be in good agreement with the experimental data. The calculated apparent activation energy of Al 3 BC 3 powder was equal to 212.76 kJ/mol at 800–1100 °C.
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2019
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IF 6.393
Shuangming Wang,Jing Cao,Wen Cui,Longlong Fan,Xifei Li,Dejun Li,Tong Zhang
One dimensional porous Co 3 O 4 rectangular microrods (MR) are designed and successfully prepared by a distinctive electrospun precursor-hydrothermal regulation-annealing treatment strategy while Co 3 O 4 nanofibers (NF) are also synthesized for comparison by directly calcining precursors without hydrothermal treatment. The hydrothermal treatment before annealing process results in morphology and structure transition of Co 3 O 4 products from compact solid nanofibers to porous rods. When applied as a gas sensing material, Co 3 O 4 porous rods based sensors exhibit enhanced gas sensing properties in terms of rapid response time (3 s), recovery time (5 s), good selectivity and stability towards 100 ppm acetone gas at a relatively low working temperature of 200 °C. Meanwhile, the response of Co 3 O 4 porous rods toward 100 ppm acetone reaches approximately 5 times higher than that of solid Co 3 O 4 nanofibers. The enhanced acetone gas sensing properties of Co 3 O 4 rectangular porous rods are believed to originate from its porous structure and large surface area, facilitating gas adsorption and surface reaction and causing significant change in the thickness of holes accumulation layer (HAL). Feasible morphology-adjusting strategy and enhanced acetone gas sensing performances further highlight the advantage of as-prepared Co 3 O 4 porous rods in future acetone real-time monitoring.
研究领域:
材料科学
·
传感器技术
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 45
·14188-14197
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IF 6.641
Xiaohua Cheng,Ye Yuan,Lin Jing,Tianliang Zhou,Zhengxiao Li,Zhiwei Peng,Qing Yao,Jie Zhang,Jianxu Ding
There has been great interest in the use of cesium lead bromide (CsPbBr3), which is one of the most important members of the all-inorganic perovskite family, due to its superior optoelectronic performance and higher stability. Recently, it has been demonstrated that it is advantageous to use CsPbBr3 microrods and nanowires in photodetectors because of their higher crystallinity, low amount of defects, and easy control of carrier transport along a specific direction as compared to their counterparts of single crystals and thin films. However, there is a shortage of adequate investigations that describe how to control the growth of CsPbBr3 microrods and nanowires so that they retain the optoelectronic performance of single CsPbBr3 microrods. Therefore, we are reporting how to control the growth of orientated dispersive super-long CsPbBr3 microrod single crystals (CsPbBr3 MSCs) via a simple anti-solvent method. The crucial factor in controlling the growth of dispersive super-long CsPbBr3 MSCs is the regulation of the rapid nucleation rate and slowing of the growth rate via controlling the diffusion velocity of anti-solvent methanol. We also reveal the growth mechanism of CsPbBr3 MSCs as layer-by-layer growth that originates from the 2D nucleus. The CsPbBr3 MSCs are revealed grew in the direction of [010], with the (101) facet exposed. Moreover, photodetectors based on one CsPbBr3 MSC were fabricated, and the detectivity (D) and the on/off ratio were as high as 3.67 × 1012 Jones and 988, respectively, suggesting a very strong optoelectronic response as photodetectors. The mechanism that the Cs ions and Cs vacancies use to move to negative and positive electrodes along the channels constructed by [PbBr6]4− in the [010] direction of the CsPbBr3 MSC (101) facet was revealed, after activation by the applied electrical field, which is beneficial to enhance the optoelectronic response but does not reduce the device stability.
研究领域:
材料科学
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光电材料
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纳米技术
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产品关联
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2015
·Vol. 31
·期 6
·899-903
·
IF 0.875
Xiao Yi,Chen Fang,Zhu Xixi,Qin Hongling,Huang Hongmei,Zhang Youyu,Yin Dulin,He Xiaoxiao,Wang Kemin
New lanthanide metal-organic framework(MOF) nano/microrods, [C 4 mim]Cl-Eu-MOF, [C 8 mim]Cl-Eu- MOF and [C 12 mim]Cl-Eu-MOF, were conveniently synthesized via an ionic liquid-assisted hydrothermal method and characterized by means of powder X-ray diffraction(XRD), Fourier transform infrared spectroscopy(FTIR), thermogravimetric analysis(TG) and transmission electron microscopy(TEM). The obtained nano/microrods with low surface areas were efficient for the removal of Congo red(CR) from aqueous solutions. Under the optimum conditions, [C 4 mim]Cl-Eu-MOF with a specific surface area of 5.1 m 2 /g exhibited an ultrahigh adsorption capacity of 2606 mg/g toward CR. Notably, the adsorption efficiency of [C 4 mim]Cl-Eu-MOF for CR via nano/microscale stacking can be directly demonstrated by TEM. In-depth understanding of CR removal by [C 4 mim]Cl-Eu-MOF nano/microrods was also supported by FTIR, Raman spectroscopy and zeta potential analyses.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2020
·
IF 4.3
Zhao Zhao,Changning Bai,Lulu An,Xiaofang Zhang,Fan Wang,Yin Huang,Mengnan Qu,Yuanlie Yu
Wastewater treatment and separation technologies are critical to meet global challenges of insufficient water supply and inadequate resources. However, simple adsorption can no longer satisfy these demands, and thus more and more water recovery technologies have attracted attention. Here, we report a novel kind of porous BN nano/microrods with excellent features including high surface area of 1109.11 m²/g, large pore volume of 0.454 cm³/g and small pore size of 2.60 nm. These unique properties make the as-obtained porous BN nano/microrods show an ultrafast adsorption rate for the cationic dye methylene blue (MB + ), and they can also be able to selectively adsorb cationic dyes from the mixtures of anionic and cationic dyes. The corresponding selective adsorption mechanism is also proposed based on the microstructure and surface property of the as-obtained porous BN nano/microrods. Furthermore, the cytotoxicity test was performed and the results show that the as-obtained porous BN nano/microrods have good biocompatibility with the cell survival rate of 80 % after a test period of 5 days, and this result is much higher than that of commercial BN. This finding provides a new application field for BN nanomaterials to selectively adsorb/separate anionic and cationic dyes in organic dye-containing wastewater treatment.
研究领域:
材料科学
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环境科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2015
·Vol. 163
·期 3
·G26
·
IF 3.266
Binbin Huang,Jie Chen,Shuzhong Zhan,Jianshan Ye
Here we report a novel approach to synthesize Schiff base metal complex with different shape and size on conductive substrate by electrochemical deposition. Deposition can be microrod clusters or octahedral particles or spherical particles through different electrolytic experimental conditions. UV–visible spectroscopy and cyclic voltammetry were used to study the mechanism of the electrodeposited process. The deposition was characterized by scanning electron microscopy (SEM), high resolution mass spectrometer (HRMS), infrared spectroscopy, UV–visible spectroscopy and X-ray photoelectron spectroscopy (XPS). The microrod clusters and octahedral particles/spherical particles are confirmed to be Schiff base cobalt complexes corresponding to CoL and H2CoL2, respectively (H2L: Bis[Salicylydene]-1,2-Iminophenylenediamine). A probably two-step mechanism of the electrodeposited process had been established and a three-dimensional nucleation model is proposed.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Nanophotonics
·
2022
·Vol. 11
·期 5
·979-986
·
IF 7.923
Hairegu Tuxun,Zefeng Cai,Min Ji,Baobao Zhang,Chengyun Zhang,Jinping Li,Xudong Yu,Zhengkun Fu,Zhenglong Zhang,Hairong Zheng
Understanding how plasmonic nanostructures generate heat upon exposure to light, and thus increase the local temperature of the surrounding medium is important for many applications. Reliable temperature manipulation requires analyzing the local temperature distribution as a function of laser density. In this work, an optical heating system containing silver nano-islands (Ag NIs) is designed to enable heat generation at the micro/nanometer scale and the local temperature can reach 1458 K. The heat generation by Ag NIs exposed to near-IR laser light, and the temperature distribution, are detected in situ via the fluorescence intensity ratio technique. It was found that the temperature of the system can be controlled by changing the excitation power. Furthermore, the temperature-dependent UCL of a single Y 2 O 3 :Yb 3+ /Er 3+ microrod is studied by taking advantage of the controllable local temperature in the optical heating system. It was found that the color of the upconversion luminescence can be tuned by managing the local temperature, and conversely, the local temperature at the optical heater can be monitored by observing the color change of the rare-earth microrod. The real-time manipulation of plasmonic heating offers an opportunity to control outcomes of thermo-plasmonic effects, which then enables a myriad of practical applications.
研究领域:
纳米技术
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光学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）