CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2014
·Vol. 30
·期 3
·362-367
·
IF 1.119
Cao Li,Jia Chunman,Zhang Qi,Chen Da,Zhang Chunyan,Qian Yaao
A fluorescent probe with a coumarin moiety bound to rhodamine 6G hydrazide( 1 ) was synthesized. Its sensing behavior toward various metal ions was investigated with fluorescence methods. Compound 1 displays different fluorescence emission responses to Al 3+ and Ca 2+ at the same excitation wavelength in the visible light region, while no changes occur after the addition of other metal ions. The binding ratios of the complexs of 1 -Al 3+ and 1 -Ca 2+ are both 2:1 according to the Job plot and high resolution mass spectrometer(HRMS) experiments. Moreover, emission spectrum of 1 -Ca 2+ complex and absorption spectrum of the rhodamine dyes overlap largely. When Al 3+ was added to the 1 -Ca 2+ system, calcium in complex 1 -Ca 2+ can be displaced by Al 3+ , resulting in the output of another ratiometric sensing signal, which demonstrates that the 1 -Ca 2+ complex can be served as a new and effective fluorescence resonance energy transfer(FRET) donor for rhodamine derivatives.
研究领域:
化学传感器
·
荧光共振能量转移
✓ 已验证
产品关联
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2021
·Vol. 4
·期 3
·733-742
·
IF 5.693
Huang Jinping,Chen Qing,Chen Shuaifeng,Luo Lijie,Li Jianbao,Lin Chunfu,Chen Yongjun
FeNb 11 O 29 has a high theoretical capacity as a potential anode material for lithium-ion batteries; however, the practical capacity of FeNb 11 O 29 reported was unsatisfactory. In this study, a simple and efficient Al 3+ -doping technique was demonstrated to improve the electrochemical performance of FeNb 11 O 29 successfully. The influences of the Al 3+ doping amount were investigated. It was found that the crystal structure of FeNb 11 O 29 could be preserved when a suitable amount of Al 3+ was added, and that Al 0.2 Fe 0.8 Nb 11 O 29 demonstrated better electrochemical performance than FeNb 11 O 29 because the structure of Al 0.2 Fe 0.8 Nb 11 O 29 is more stable. At 0.1C, Al 0.2 Fe 0.8 Nb 11 O 29 possessed a high reversible capacity of 318 mAh g −1 with an initial-cycle Coulombic efficiency of 95.0%. Al 0.2 Fe 0.8 Nb 11 O 29 exhibited outstanding cycling stability with capacity retention of 92.9% at 10C over after 1000 cycles. Moreover, A LiFePO 4 /Al 0.2 Fe 0.8 Nb 11 O 29 full cell was prepared successfully with a discharge capacity of 206 mAh g −1 . The full cell exhibited good cycling stability showing the capacity retention of 84.2% over after 200 cycles at 1C and 89.8% over after 1000 cycles at 5C, respectively. This work suggests that Al 0.2 Fe 0.8 Nb 11 O 29 has great application prospects in lithium-ion batteries. Graphical abstract A suitable amount of Al 3+ doping in FeNb 11 O 29 significantly improves the electrochemical performance (especially the reversible capacity) of FeNb 11 O 29 .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Yue Leng,Shengde Dong,Zhan Chen,Yanxia Sun,Qi Xu,Luxiang Ma,Xin He,Chunxi Hai,Yuan Zhou
In this study, we addressed the poor cycling and rate performance of LiNiO2, a material with ultrahigh nickel content considered a strong contender for high-energy-density lithium-ion battery cathodes. We introduced nano-Al2O3 during the lithiation process to achieve dual modified material through bulk phase element doping and in situ LiAlO2 coating. Comparison revealed notable improvements in the modified materials. In particular, LiNi0.99Al0.01O2 maintained a capacity retention rate of 73.1% after 300 cycles in a long-cycle test at 0.5C current density, outperforming the undoped material. In rate performance tests, the doped samples consistently exhibited higher discharge-specific capacities than that of the undoped counterpart. Notably, at a high current density of 5C, LiNi0.99Al0.01O2 exhibited a discharge-specific capacity of 101.75 mAh g–1. The results indicate that an appropriate amount of Al doping can effectively stabilize the layered structure of the cathode material and delay the irreversible phase transition from H2 to H3. Further, Al doping facilitates the formation of a LiAlO2 coating on the surface of the particles. This coating acts as a fast-ion conductor, enhancing the transport of lithium ions and reducing the erosion of the active material by the electrolyte.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Xingling Zhao,Xue Zhou,Wanyan Xing,Zhimin Yuan,Kaili Wang,Qihang Zhang,Yulong Shan,Jiani Liu,Lin Ju,Zaiyong Jiang,Hong He
CO is a ubiquitous air pollutant, frequently encountered in the fields of automotive exhaust purification, especial in the cold-start-emission stage. Pt based catalysts are widely used to purify CO into CO 2 owing to their exceptional performance. But they can be few excited to exhibit reasonable catalytic activity due to the low temperature at the cold-start-emission stage. In exhaust gas purification catalysts used by fossil fuel-based vehicles, Al 2 O 3 is used frequently. But there are rarely reports of Pt loaded Al 2 O 3 catalysts achieving feasible activity of CO oxidation at room temperature. Herein, we prepared Cu x Pt y alloy/Al 2 O 3 catalysts (with high penta-coordinated Al 3+ (Al V )), Al V centers as binding sites for Cu 3 Pt 1 alloys on Al 2 O 3 enable the high dispersion and stability of Cu 3 Pt 1 alloy. The adsorption capacity of O 2 and CO molecules on Cu 3 Pt 1 surface are stronger than the case on Pt surface, which may make O 2 and CO molecules more easily activated, making the CO oxidation reaction easier. In addition, the desorption of CO 2 from Cu x Pt y surface is easier compared to that on Pt surface, increasing the frequency of use of active sites there. Therefore, this Cu 3 Pt 1 /Al 2 O 3 catalyst exhibits 100 % conversion of CO with a GHSV of 6×10 3 mL·g −1 cat ·h −1 at room temperature. This work provides a feasible guideline for the design and synthesis of Pt loaded Al 2 O 3 catalysts toward room temperature CO oxidation.
研究领域:
材料科学
·
催化化学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Yao Yang,Yanli Shi,Junjing Duan,Kailei Lu,Gang Cheng,Yiding Zhao,Zhangyi Huang,Peitong Li,Nian Wei,Xinghua Zhu,Jianqi Qi,Tiecheng Lu
The exploration of new red phosphors is important for the development of white light-emitting diodes (w-LEDs), as existing red phosphors exhibit low efficiency and low performance. This work aims to enhance the photoluminescence characteristics of a red-emitting Gd 2 Zr 2 O 7 :Eu 3+ phosphor by co-doping with Al 3+ . Eu 3+ single-doped and Eu 3+ and Al 3+ co-doped Gd 2 Zr 2 O 7 nanophosphors that could be efficiently pumped by commercial near-UV LED chips were prepared by a modified liquid–solid–solution phase-transfer method. X-ray diffraction data revealed that the synthesized phosphors were well crystallized with single-phase fluorite structure. Scanning electron microscopy images showed that the particle size ranges from 15 to 25 nm. In addition, the optical performance of the samples was characterized by fluorescence spectroscopy and lifetime spectroscopy. The effect of Al 3+ on the luminescence performance of the Eu 3+ -doped Gd 2 Zr 2 O 7 phosphor was studied in detail. The emission intensity of the Gd 1.93 Zr 1 · 97 O 7 :Eu 3+ 0.07 Al 3+ 0.03 phosphor was found to be 620% stronger than that of the single-doped Eu 3+ phosphor. These results unambiguously show that the Gd 1.93 Zr 2- x O 7 :Eu 3+ 0.07 Al 3+ x phosphors are promising candidates for application in w-LEDs.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2012
·Vol. 22
·期 31
·15887-15893
·
IF 5.968
Hongde Luo,Jie Liu,Xiao Zheng,Lixian Han,Kuaixia Ren,Xibin Yu
Trivalent ions B3+, Al3+ and Ga3+ have been introduced into Sr3SiO5:Ce3+ in this study. Among these ions, Al3+ and Ga3+ act as charge compensators and significantly enhance the maximum emission of Ce3+ by about 100% and 90%, respectively. Then, Al3+, Eu2+ co-doped Sr3SiO5:Ce3+ phosphors have been researched, which indicate that the emission spectra can be tuned from 530 to 575 nm by changing the concentration of Eu2+. The CIE chromaticity coordinates of the phosphors were calculated from (0.342, 0.518) to (0.442, 0.479). This indicates a potential for applications in daylight LEDs or warm-white LEDs.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Cheng Liu,Huiling Chen,Qi Chen,Jinhong Bi,Jimmy C. Yu,Ling Wu
A series of Al 3+ -doped UiO-66(Ce) MOFs (U(Ce x Al 1−x )) was developed to reveal the roles of metal doping on active site formation and substrate activation in photocatalytic selective transformation of amines to imines. Al 3+ doping induced crystal structure distortion to form coordinately unsaturated metal (Al, Ce) sites as Lewis acid sites to chemisorb and activate benzylamine (BA). In situ FTIR revealed that the Al site with stronger acid strength facilitated BA activation. The activation degree of N–H bonds in BA was evaluated by changes of calculated force constant. The intermediate products were confirmed through time-dependent in situ FTIR. The Al 3+ -doped sample U(Ce 0.90 Al 0.10 ), the optimal catalyst, showed a significantly increased BA conversion (97.6 %) than that (47.5 %) of undoped sample, which was attributed to enough active sites and the optimal charge mobility. Finally, the present study proposes a synergistic photocatalytic mechanism associated with molecular activation to demonstrate selective oxidation pathways at the molecular level.
研究领域:
材料科学
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化学工程
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2014
·
IF 2.367
Xing-Pei Ye,Shao-bo Sun,Ying-dong Li,Li-hua Zhi,Wei-na Wu,Yuan Wang
A new o -aminophenol-based fluorogenic chemosensor methyl 3,5-bis(( E )-(2-hydroxyphenylimino)methyl)-4-hydroxybenzoate 1 have been synthesized by Schiff base condensation of methyl 3,5-diformyl-4-hydroxybenzoate with o -aminophenol, which exhibits high selectivity and sensitivity toward Al 3+ . Fluorescence titration studies of receptors 1 with different metal cations in CH 3 OH medium showed highly selective and sensitive towards Al 3+ ions even in the presence of other commonly coexisting metal ions. The detection limit of Al 3+ ions is at the parts per billion level. Interestingly, the Al(III) complex of 1 offered a large Stokes shift (>120 nm), which can miximize the selfquenching effect. In addition, possible utilization of this receptor as bio-imaging fluorescent probe to detect Al 3+ in human cervical HeLa cancer cell lines was also investigated by confocal fluorescence microscopy .
研究领域:
生物化学
·
分析化学
·
细胞生物学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Nian Zhang,Fujian Li,Kaibo Hu,Zhongzhi Wang,Haiyang Xue,Bangyu Fan,Xiangping Zhang,Haifeng Dong
As the associated element of ion-adsorbed type rare earth ores, aluminum ion (Al 3+ ) has a great influence on the purification of gadolinium ion (Gd 3+ ). In this paper, six carboxylic ionic liquids were synthesized with methyltrioctylammonium ([N1888] + ) as cation and carboxyl group as anion, and optimized for selective separation of Al 3+ /Gd 3+ . The extraction capability, separation factor, stripping property and recycling stability of the ionic liquid on the separation of Al 3+ and Gd 3+ were systematically investigated. In addition, the loaded Al 3+ can be totally stripped by 0.08 mol‧L −1 HCl solution. A particularly high separation factor of 923 can be obtained for removing Al 3+ from industrial GdCl 3 feed solution (762 mg‧L −1 Al 3+ and 146 g‧L −1 Gd 3+ ). The removal rate of Al 3+ was up to 98.69% and the recovery rate of Gd 3+ achieved at 92.47% by carboxylic ionic liquid ([N1888][C 7 H 11 O 2 ]) in one-step extraction. After 0.6 mol‧L −1 HCl solution stripping and 0.5 mol‧L −1 NaOH solution regenerating, the extraction efficiency of Al 3+ was only reduced by 3% after 5 cycles of organic phase. With the low acid and base concentration, it greatly reduced the chemical consumption and significantly the emission of high ammonia–nitrogen wastewater in industry. This work provides a low-carbon process for efficient removal of Al 3+ from industrial GdCl 3 feed by carboxylic ionic liquids.
研究领域:
化学工程
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Optical Materials
·
2024
·
IF 0
Xunsheng Zhou,Binqing Zhao,Lu Yao,Wanting Gui,Longfei Chen,Chao Li,Shi Zhang,Cai Lin Wang
Eutectic scintillators with 6Li-containing thermal neutron absorbers are capable of efficient thermal neutron detection due to lamellar or rod-like optical waveguide structures formed by directional solidification. However, developing stable and bright eutectic scintillators with excellent neutron imaging capability remains a challenge. Here, the performance parameters for the scintillator have been substantially improved by the Al3+ codoping strategy in the LiF-CaF2:Eu2+ system. Due to the Al3+ codoping, the photoluminescence quantum yield (PLQY) is enhanced from 55% to 80%, the light yield is increased from 11,000 to 16,000 photons/thermal neutron, and the scintillation decay time is shortened by about 30 ns. It was shown that Al3+ codoping can effectively reduce the low-frequency shallow-energy level traps. Furthermore, large-sized (50 × 50 × 1.5 mm) translucent LiF-CaF2:Eu2+, Al3+ eutectic ceramics have been fabricated for an Anger-logic position-sensitive detector to realize two-dimensional (2D) thermal neutron detection. A codoped LiF-CaF2 eutectic scintillator provides a ∼1 mm spatial resolution and thermal neutron detection efficiency 16% higher than that of a commercial GS20 scintillator. This research paves the way for the application of large-area eutectic scintillators for efficient thermal neutron detection.
研究领域:
材料科学
·
核物理
·
光学
✓ 已验证
DOI
INTEGRATED FERROELECTRICS
·
2023
·
IF 0.7
Kang-Qiang Liu,Chuan-Bao Wu,Si-Yu Zhou
ABSRACTFor achieving a uniform and stable suspension of CeO2 nanoparticles in aqueous medium, Al3+ was doped into the lattice of CeO2 by hydrothermal treatment. Although the doping will increase the probability of adhesion of primary particles with the size of 7 nm, it can effectively prevent the agglomeration between CeO2 particles, greatly improve the dispersion uniformity and suspension stability of particles, greatly narrow the particle size distribution of secondary particles, and make the degree of particle agglomeration controllable. Meantime, the UV absorption property of the product was improved and the absorption peak was red shifted after Al3+ doping.
研究领域:
材料科学
·
纳米技术
·
化学工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zhiwei Xia,Yuhan Wang,Rujun Yang,Mengdi Xu,Cunjian Lin,Zhongyuan Li,Ying Lv,Xiaopeng Chi,Shihai You
The interstitial site engineering that purposely creates interstitial luminescent centers in suitable hosts has become an intriguing strategy in designing novel inorganic phosphors. However, effectively tuning the photoluminescence of interstitial activators remains tough challenging at this stage. Here, we demonstrate the effective modulation of interstitial luminescence in inorganic phosphor. In detail, the blue emission band ( λ em = 446 nm) of interstitial Eu 2+ doped α -cristobalite (SiO 2 :Eu 2+ ) is largely enhanced and broadened via a partial, aliovalent substitution of Si 4+ by Al 3+ . After introducing Al 3+ ions into SiO 2 lattice, the full width at half maximum of the blue emission band increase from 59 to 76 nm with a triple growth in quantum efficiency (10.82% → 35.56%). Moreover, the thermal stability improves significantly with a high emission retention of 60% at 325 °C (SiO 2 :0.06Al 3+ ,0.005Eu 2+ ), far higher than that of the parent SiO 2 :0.005Eu 2+ (30%). Encapsulating blue-emitting SiO 2 :Al 3+ ,Eu 2+ along with two commercial green and red phosphors on an ultraviolet LED chip ( λ em = 375 nm), a white LED device with high color rendering index (Ra > 90) was successful fabricated, showing the great potential of this phosphor for achieving high-quality white LED lighting. This study not only provides a promising bule emitter but also sheds light on modulating interstitial luminescence properties in inorganic phosphors.
研究领域:
材料科学
·
光学工程
✓ 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）