ADVANCED POWDER TECHNOLOGY
·
2014
·
IF 1.642
Renping Cao,Kangbin Chen,Qianglin Hu,Wensheng Li,Hui Ao,Chunyan Cao,Tao Liang
A series of Sr (1 − x − y − z ) MoO 4 : x Eu 3+ , y Bi 3+ , z R + (R + = Li + , Na + , and K + ) phosphors are prepared through solid-state reaction method in air. Eu 3+ doped SrMoO 4 phosphor can show red emission at ∼616 nm under excitation 275 nm and 397 nm light due to the 5 D 0 → 7 F 2 transition of Eu 3+ ion, and its emission intensity can be enhanced after co-doping Bi 3+ owing to energy transfer between Bi 3+ and Eu 3+ ions. The mechanism of energy transfer is discussed by the schematic energy level diagrams of Bi 3+ and Eu 3+ ions. The optimal composition in Eu 3+ and Bi 3+ co-doped SrMoO 4 phosphors is determined to be (Sr 0.92 Eu 0.05 Bi 0.03 )MoO 4 . The emission intensity of SrMoO 4 :Eu 3+ , Bi 3+ phosphor is found to be further improved by using Li + , Na + , and K + ions as charge compensators. These experiment results in the paper are helpful to develop novel and high-efficiency phosphors for white light-emitting diodes.
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高影响因子
OPTIK
·
2013
·
IF 0.524
Zhijuan Cao,Fengxian Qiu,Qing Wang,Guorong Cao,Lin Zhuang,Qiang Shen,Xiaolong Xu,Jie Wang,Qian Chen,Dongya Yang
The azo benzothiazole polyurethane–urea (ABPUU) was synthesized from chromophore molecule 4-[(6-nitrobenzothiazole-2-yl)diazenyl]phenyl-1,3-diamine NBDPD, polyether polyol (NJ-210) and isophorone diisocyanate (IPDI). The structure, thermal property , mechanical property and physical property were characterized and investigated. The refractive index ( n ) and thermo-optic coefficient (d n /d T ) of ABPUU was determined at different temperature and wavelength (532 nm, 650 nm and 850 nm) using attenuated total reflection (ATR) technique. Using the CCD digital imaging devices, transmission loss of ABPUU was measured. A 1 × 2 Y-branched and 2 × 2 Mach–Zehnder interferometer (MZI) switch with two rib waveguides , dual driving electrodes and two critical 3-dB couplers polymeric thermo-optic switches based on thermo-optic effect of prepared ABPUU were designed and simulation. The power consumption of the Y-branched switch is less than 0.84 mW. The Y-branched and MZI switching rising and falling times obtained are 0.8 ms and 0.2 ms, respectively.
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2017
·Vol. 19
·期 6
·1-15
·
IF 2.02
Qin Xin,Shi Penghui,Liu Haolin,Fan Jinchen,Min Yulin,Xu Qunjie,Yao Weifeng
Metal nanoparticles have been combined with magnet metal–organic frameworks (MOFs) to afford new materials that demonstrate an efficient catalytic degradation, high stability, and excellent reusability in areas of catalysis because of their exceptionally high surface areas and structural diversity. Magnetic M
x
O
y
@N-C (M = Fe, Co, Mn) nanocrystals were formed on nitrogen-doped carbon surface by using 8-hydroxyquinoline as a C/N precursor. The Co@N-C, MnO@N-C, and Fe/Fe 2 O 3 @N-C catalysts were characterized by X-ray diffraction (XRD), Raman, scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), N 2 adsorption/desorption, and X-ray photoelectron spectroscopy (XPS). The catalytic performances of catalysts were thoroughly investigated in the oxidation of aniline solution based on sulfate radicals (SO 4
−. ) toward Fenton-like reaction. Magnetic M
x
O
y
@N-C exhibits an unexpectedly high catalytic activity in the degradation of aniline in water. A high magnetic M
x
O
y
@N-C catalytic activity was observed after the evaluation by aniline degradation in water. Aniline degradation was found to follow the first-order kinetics, and as a result, various metals significantly affected the structures and performances of the catalysts, and their catalytic activity followed the order of Co > Mn > Fe. The nanoparticles displayed good magnetic separation under the magnetic field.
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zhenyu Xu,Han Liu,Weiping Zhou,Wanchun Yu,Guoqiang Xiao,Di Lu,Fei Gao,Zhenzhi Cheng,Guangsheng Luo
In this study, the impact of Gd 3+ doping on the structural, magnetic and dielectric properties of BaSrCo 2 (Fe 1- x Gd x ) 11 AlO 22 ( x = 0, 0.02, 0.04, 0.06, 0.08, 0.1) ferrite ceramics synthesized by the conventional solid-state reaction method are investigated. XRD results reveal that all the samples crystallize in the R 3 ‾ m space group. With the increase of Gd content, the formation of M-type phase is effectively inhibited due to Gd 3+ ions may change the activation energy of nucleation of the grains and the formation energy of hexaferrite. SEM analysis confirms the presence of hexagonal grains in samples with homogeneous elements distribution. The XPS results verify the coexistence of ferric and ferrous ions in the ceramics. The magnetization and coercivity are suppressed by Gd 3+ substitution. The permeability increases firstly and then decreases with the substitution of Gd ions. While the dielectric constant increases with the substitution of Gd. The real and imaginary parts of the dielectric constant in the frequency range of 2–18 GHz change slightly with doping amounts variation, and all the samples exhibit prominent peaks at about 14 GHz due to natural resonance.
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Catalysts
·
2024
·Vol. 14
·期 5
·324
·
IF 3.8
Jing Wang,Lingling Feng,Zikang Zhao,Yan Wang,Ying Zhang,Shan Song,Shengwei Sun,Junshuang Zhou,Faming Gao
Given the energy crisis and escalating environmental pollution, the imperative for developing clean new energy is evident. Hydrogen has garnered significant attention owing to its clean properties, high energy density, and ease of storage and transportation. This study synthesized four types of catalysts—FeS(DI/MB), FeS(ET/MB), Fe(DI/MB), and Fe(ET/MB)—using two distinct solution systems: DI/MB and ET/MB. The FeS(DI/MB) catalyst, synthesized using the layered solution system (DI/MB), demonstrates a uniformly distributed and dense nanosheet structure, exhibiting excellent resistance to strong bases and superior catalytic properties. The FeS(DI/MB) electrode showed OER overpotentials of 460 mV and 318 mV in 1 M and 6 M, respectively, at current densities of up to 500 mA cm−2. Under industrial electrolysis test conditions, the FeS(DI/MB) electrode required only 262 mV to achieve a current density of 500 mA cm−2, operating in a high-temperature, strong alkaline environment of 6 M at 60 °C. Furthermore, the FeS(DI/MB) electrode exhibited excellent OER catalytic activity and stability, as evidenced by a 60 h stability test These findings provide valuable insights into the preparation of iron nickel sulfide-based catalysts, and further in-depth and comprehensive exploration is anticipated to yield the excellent catalytic performance of these catalysts in the realm of electrolytic water hydrogen production.
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CORROSION SCIENCE
·
2024
·
IF 7.4
Keda Xiao,Yi Zeng,Xiang Xiong,Jinrun Hu,Shiyan Chen,Tianyou Li
Si-B-Mo-Y modified SiC/SiC composites were prepared by reactive melt infiltration (RMI) process to study their high-temperature water-oxygen corrosion resistance, and to compare them with SiC/SiC composites prepared by RMI using Si. The results show that the corrosion rates of the modified composites are only 1/9, 1/10 and 1/3 of those of the comparison samples at 1200°C, 1300°C and 1400°C, respectively, which is attributed to the higher densification of the modified composites. More importantly, the modified composites were able to form borosilicates, which effectively healed the oxide film defects; meanwhile, yttrium silicate inhibited the reaction between borosilicates and water vapor.
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高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Runzi Zhang,Shunbi Xie,Xiang He,Ying Gao,Mengjun Wang,Minghang Jiang,Xiaojun Luo,Yi He
Chloramphenicol (CAP), as a broad-spectrum antibiotic, is genotoxic to humans. In this paper, a “Y-shaped” SERS biosensor based on magnetic plasmonic superstructures Fe3O4@SiO2@Ag flowers and the highly efficient isothermal amplification strategy of exponential amplification reaction (EXPAR) technology was proposed for ultrasensitive detection of CAP in milk. This was achieved by forming a stable “Y-shaped” structure on the abundant sharp tips of Fe3O4@SiO2@Ag flowers through specific three-part assembly (Probe 1 connected to the magnetic substrate, Signal Probe 2 Au@4-NTP, and the EXPAR amplification product Amplicon). When the CAP was present, the Amplicon obtained from EXPAR amplification could form a “Y-shaped” structure with the magnetic material and the signal probe. Benefiting from the abundant branching, extensive surface area, and rough surface of the magnetic Fe3O4@SiO2@Ag flower, it offers a multitude of “hot spots” for plasmonic coupling in the electromagnetic field gap region and significantly reduces the nanogap between the signal probe and the silver nanoflowers by constructing a “Y”-shaped structure, thereby maximizing the amplification of the Raman signal. Enabling the detection range of CAP to be between 10–6 and 10–13 M with a detection limit of 17.9 fM. This strategy provided an avenue for trace detection of CAP in food.
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ADVANCED MATERIALS
·
2025
·
IF 26.8
Shuhong Yi,Chenlong Gao,Qingfeng Fu,Shiru Wu,Jian-Fang Wu,Yan Duan,Menghao Yang,Jilei Liu
Solid-state potassium-ion batteries are promising options for large-scale energy storage due to their high safety and abundance of potassium resources. However, solid-state potassium-ion batteries are still in their infancy and the reported electrolyte materials are very limited, making the exploration of solid electrolytes with high ionic conductivity and physical/electrochemical stability a major challenge. Here novel triclinic K 3 LnSi 3 O 9 (Ln = Y and Gd) potassium-ion solid electrolyte is reported with low activation energy and high stability. A rational vacancy design strategy is adopted to synthesize K 3−x GdP x Si 3−x O 9 and the result of DFT calculation shows that the diffusion pathways of potassium ions on the ac plane exhibit a fish scale-like network structure. Specifically, the K 2.8 GdP 0.2 Si 2.8 O 9 delivers a high ionic conductivity of 2.9 × 10 −5 S cm −1 at 25 °C, accompanied by a stable potassium stripping/plating (a long-life cycle over 2000 h). As a result, the assembled quasi-solid-state KC/K 2.8 GdP 0.2 Si 2.8 O 9 /PB cell achieves a remarkable cycling performance at a high current density of 1 C (500 cycles, 95.9% capacity retention). These results would no doubt boost research for high-safety and high-energy-density solid-state potassium-ion batteries.
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DOI
PubMed
高影响因子
Energy Storage Materials
·
2024
·
IF 18.9
Meng Wang,Xiaolang Liu,Wen Zhang,Hongwei Niu,Leimin Xu,Jiantao Han,Yuhao Lu
For the first time, this work investigates the synergetic impact of yttrium (Y) and aluminium (Al) co-doping on the electrochemical properties of 4.6 V LiCoO 2 (LCO) cathode for high energy density lithium-ion batteries. The optimized LCO demonstrates an impressive initial discharge capacity of 208.6 mAh g −1 in the voltage range of 3–4.6 V, along with superior structural stability , retaining over 86 % of its initial capacity even after 125 cycles at the current of 100 mA g −1 that is far higher than the capacity retention of 40 % for the pristine LCO under the same condition. Thanks to the synergistic effect , Al in Co layers enhances the bonds of Al/Co-O to stabilize oxygen in the LCO crystal structure while Y serves “pillar” in Li layers, migrated from the initial Co layers during cycling process, effectively curtail the formation and expansion of interlayer cracking, which contributes to the long-term cycle stability of LCO under high voltage. Most importantly, Al/Y co-doping is a facile process compatible with the existing industrial infrastructure for LCO mass production, and thus it can be scaled up readily for commercial applications. Al/Y co-doped LCO is assembled into commercial-level pouch cells with graphite anode, achieves an extremely high energy density of 750 Wh/L, and exhibits a superior cycling stability and obtains a capacity retention of 88.2 % at 25 °C after 800 cycles with the high cutoff voltage of 4.55 V.
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RSC Advances
·
2025
·Vol. 15
·期 26
·21156
·
IF 4.6
Shaojie Hong,Fanhua Yu,Bin Guo,Xiangqian Ren,Xingfu Zhou
In recent years, “green synthesis” technology has emerged at the research forefront of the chemical industry as an environmentally friendly approach. As a new and effective chemical synthesis method, organic electrochemical synthesis technology has attracted increasing attention. In this paper, the sol–gel method is used to fabricate a Y-doped Ti/TiO 2 electrode. By adding different concentrations of Y ions, the macropore morphology of the film becomes more obvious, and substrate cracks are improved to a certain extent. EIS tests show that a 0.006-Y electrode exhibits lower charge-transfer resistance. Furthermore, linear voltammetry (LSV) analysis showed that the hydrogen evolution potential of the Y-doped Ti/TiO 2 film electrode was improved. At the optimal Y/Ti molar ratio of 0.006, hydrogen evolution potential reached −1.22 V, showing a −0.19 V shift compared with the undoped electrode, and the hydrogen evolution side reaction was effectively inhibited. Cyclic voltammetry (CV) tests show that the reduction peak current density in maleic acid solution is as high as 210 mA cm −2 , which is 1.7 times that of the undoped electrode, indicating that the addition of Y at trace concentrations improves the electrocatalytic reduction performance of the electrode. Considering that the cathode can reduce maleic acid at lower potential and has higher catalytic activity, cathode potential is controlled within the range of −0.6–1.2 V for the electrosynthesis of succinic acid. When the optimized reaction temperature is 50 °C, the electrosynthesis yield for succinic acid reaches 91%, and the current efficiency reaches 96.3%. Y-doped Ti/TiO 2 electrodes were prepared for succinic acid electrosynthesis. Y doping enhanced electrocatalytic reduction, achieving 91% yield and 96.3% current efficiency at 50 °C.
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PubMed
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ACS Omega
·
2020
·
IF 2.87
Yi Cao,Peiyuan Tang,Wenfeng Qiu,Tong Zhao
Flexible all-solid-state supercapacitors have drawn more attention owing to the rapid growth of wearable electronic equipments. Herein, we have succeeded in synthesizing a series of Y-doped lanthanum titanate flexible self-supporting films (LSF-x, 0.1 ≤ x ≤ 0.5) and investigating the change of microstructures, morphological characteristics, and lattice structures of these films affected by different Y-doping contents. To further determine the optimum Y-doping content, we have explored the electrochemical properties of working electrodes prepared by LSF-x (0.1 ≤ x ≤ 0.5) samples as the main active material. As the LSF-0.2 electrode has the best areal capacitance of 1.3 F·cm–2 at 2 mA·cm–2, we use the LSF-0.2 electrodes and PVA–Na2SO4 gel to fabricate a flexible all-solid-state supercapacitor device. This device has a high areal capacitance of 255.9 mF·cm–2 at a current density of 2 mA·cm–2 with a high cell voltage of 2.1 V, while the corresponding energy density is 156.8 μWh·cm–2 with a power density of 2.1 mW·cm–2. Moreover, it also shows a long cycling life and outstanding flexibility. Therefore, the LSF-0.2 sample can be used as an excellent energy-storage material for a wearable electronic device.
研究领域:
材料科学
·
能源技术
·
纳米科技
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Journal of Physical Chemistry C
·
2017
·
IF 4.536
Dongxu Zhu,Aiwei Tang,Qinghua Kong,Bin Zeng,Chunhe Yang,Feng Teng
Ternary alloyed Cu2–xSySe1–y nanocrystals (NCs) were synthesized by using a simple and phosphine-free colloidal approach, in which sulfur powder and 1-dodecanethiol (DDT) were used as sulfur sources. In both cases, the crystal phase transformed from cubic berzelianite to monoclinic djurleite structure together with the morphology evolution from quasi-triangular to spherical or discal with an increase of sulfur content. Accordingly, the near-infrared (NIR) localized surface plasmon resonance (LSPR) absorption of the as-obtained sulfur-rich NCs exhibited obvious red-shift of wavelength and widening of absorption width. When the sulfur powder was chosen as sulfur sources, the LSPR wavelength of the as-obtained alloyed Cu2–xSySe1–y NCs could be tuned from 975 to 1230 nm with a decrease of selenium content in the NCs. In contrast, the region of the red-shift could be up to 1250 nm for the alloyed NCs synthesized by incorporation of different DDT dosage into the reaction system. The different sulfur sources and the electron donating effects of the DDT as a ligand played an important role in the LSPR absorption tuning. This deduction could be testified by the post-treating the quasi-triangular Cu2–xSe NCs with DDT under different temperatures and over different reaction time, which exhibited a red-shift of LSPR wavelength up to 450 nm due to coordination of DDT to Cu atoms on the NC surface while incorporating some sulfur anions into the lattice. This study offers a convenient tool for tuning the LSPR absorption of copper chalcogenide NCs and makes them for application in biological and optoelectronic fields.
研究领域:
纳米材料
·
等离激元学
·
胶体化学
·
光电子学
·
材料科学
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