JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Fang Wang,Xiao-Ni Yao,Yao Guo,Liguo Yang,Yi-Gang Chen,Xian-Ming Zhang
Two new metal aluminium phosphate millimetre-crystals NaBa 2 Al(P 2 O 7 ) 2 and NaBaAl(PO 4 ) 2 were successfully grown by using high-temperature molten method. The crystals NaBa 2 Al(P 2 O 7 ) 2 and NaBaAl(PO 4 ) 2 are located in space groups P ¯1 and P 2 1 /c, respectively. NaBa 2 Al(P 2 O 7 ) 2 displays a [Al(P 2 O 7 ) 2 ] 1D chain structure constructed from corner-sharing linkage of novel AlP 4 O 16 9− anion groups, and the AlP 4 O 16 9− group is formed by edge-sharing connection of two P 2 O 7 dimers and one AlO 6 octahedron . However, NaBaAl(PO 4 ) 2 exhibits a new [Al(PO 4 ) 2 ] 2D layer structure composed of AlP 2 O 10 7− anion groups via corner-sharing, and the AlP 2 O 10 7− group is generated by alternate linkages of corner-sharing PO 4 and AlO 4 tetrahedra. Analysis based on Pauling's electrostatic rule and Brown's bond valence model finds that structural feature of the two anion groups is mainly responsible for their different dimension structures in addition to structure-directed role of large Ba 2+ . The two crystals manifest a deep-UV optical transparency below 190 nm and good thermal stability, making them a potential optical window material. First-principles calculations reveal that the optical bandgaps of both crystals are determined by the Ba–O groups, rather than Al–O and P–O common groups.
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Qing Zhou,Kaiyu Lin,Yongxin Liu,Guohan Sun,Shumei Wang,Haiyun Zhai
A novel nonenzymatic electrochemical sensor with high sensitivity for detecting organic phosphate (OPS) in medicinal herbs was fabricated based on a Mg-Al layered double hydroxide (Mg-Al LDH) nanocomposite glassy carbon electrode (GCE) modified with a poly-m-amino-benzenesulfonic acid (p-m-ABSA) film. Depositing Mg-Al LDH nanocomposites onto the surface of the p-m-ABSA composite resulted in an effective electrical response by increasing the electrode surface area and enhancing the electron transfer process, so the electrocatalytic activity was significantly enhanced. The research illustrated that the fabricated sensor (Mg-Al LDH/p-m-ABSA/GCE) exhibited strong affinity, high sensitivity, and selectivity towards methyl parathion (MP) and fenitrothion (FNT). Scanning electron microscopy (SEM) was used to characterize the surface morphology of the modified electrode and showed that the p-m-ABSA film and a few p-m-ABSA nanoparticles were coated on the surface. The surface area of the electrode was further enlarged by Mg-Al LDH owing to their layered nanostructure. Under optimal conditions, the anodic current had a linear relation equal to 0.1∼20.0 µM MP and 0.01∼50.0 µM FNT, with detection limits (S/ N = 3) of 33.0 nM MP and 3.5 nM FNT, respectively. Furthermore, Mg-Al LDH/p-m-ABSA/GCE was successfully used for the detection of MP and FNT in Astragalus and Magnolia medicinal herb samples.
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产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 18
·4582-4593
·
IF 7.779
Xiaoxiao Niu,Meixiang Wang,Mengyu Zhang,Rui Cao,Zhaodi Liu,Fuying Hao,Liangquan Sheng,Huajie Xu
In this work, two novel fluorescent nanoprobes for detecting the anthrax biomarker 2,6-dipicolinic acid (DPA) have been developed based on a well-designed anionic sulphonated naphthalene derivative (L) by intercalating and coordinating Mg-Al-Ln-LDHs (Ln = Tb, Eu). The nanosensors exhibited good photostability and high reference fluorescence intensity due to a strong coordination interaction between the L and Al3+ ions of Mg-Al-Ln-LDH layers. Meanwhile, attributed to the antenna action of DPA in triggering the characteristic fluorescence emissions of Tb3+ and Eu3+ through energy transfer, the L-anchored Mg-Al-Ln-LDH nanoparticles exhibited high sensitivity and selectivity and remarkably stable ratiometric fluorescent detection of anthrax spore biomarkers in aqueous solutions, serum and actual spores. Benefiting from the intercalation and coordination of L into Mg-Al-Ln-LDHs, the obtained L@Mg-Al-Ln-LDHs can provide a reliable and stable reference signal for the fluorescence ratiometric detection of DPA with a limit of detection (LOD) of 11.6 nM and 3.56 × 103 spores per mL. More prominently, combining L@Mg-Al-Ln-LDH-based detection test strips with a smartphone demonstrates a reliable, rapid and simple method for real-time monitoring of anthrax biomarkers.
研究领域:
分析化学
·
生物医学
·
材料科学
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 35
·期 1
·1-13
·
IF 2.8
Sun Qin,Yang Wanchun,Hu Zhongyu,Jia Gaozhi,Wang Yangyang
Copper pastes are widely used in metallization of ceramic surfaces but are limited by poor oxidation resistance, high resistivity, and low bonding strength. In this work, the 30Bi 2 O 3 –55B 2 O 3 –15ZnO glass powder was prepared by the melt-quenching method. A copper paste containing the glass powder and formic acid-treated copper microparticles was used for metallization of α -Al 2 O 3 ceramic surface. The copper thick films were obtained by low-temperature sintering after screen printing. The effects of the glass powder contents on resistivities and shear strengths of the copper films on α -Al 2 O 3 ceramic substrate were analyzed. The microstructures of the copper thick films and the interfacial bonding mechanism on the α -Al 2 O 3 ceramic surface were investigated in detail. The copper thick film with 10-wt% 30Bi 2 O 3 –55B 2 O 3 –15ZnO glass and sintered at 650 °C for 20 min exhibited a low resistivity (3.38 ± 0.94 µΩ cm) and a high shear strength (35.24 ± 1.2 MPa). ZnAl 2 O 4 and Bi 2 B 4 O 9 were detected on the edges of the copper film near the interface, which enhanced interfacial binding between the copper thick films and the α -Al 2 O 3 ceramic substrate. These results demonstrated that the low-temperature sintering copper paste containing 30Bi 2 O 3 –55B 2 O 3 –15ZnO glass was effective for α -Al 2 O 3 ceramic surface metallization.
研究领域:
材料科学
·
陶瓷
·
冶金学
·
电子封装
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DOI
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 9
·0950a8
·
IF 1.449
She Jia,Zhengjun Yao,Shasha Zhang,Zelei Zhang,Xuewei Tao,Yingying Liu,Linchao Sun
Graphene (Gr) has attracted much attention due to its excellent performance. There are various studies about Gr composite materials; however, the influence of Gr on anticorrosion mechanism was not explored widely. In this paper, the Gr was prepared by oxidation-reduction method and was modified with 3-aminopropyl triethoxysilane for better dispersion. Fourier Transform Infrared Spectroscopy (FT-IR) and Scanning Electron Micrograph (SEM) were utilized to characterize the microstructure of coating and the modification of Gr. X-Ray Diffraction (XRD) was employed to analyse the phase composition of the coating. The anticorrosion performance of coating was investigated by employing polarization curves and electrochemical impedance spectroscopy (EIS). The results showed that the uniformly dispersed Gr nanosheets in Zn-Al-Gr/waterborne epoxy enhanced the protection property of the composite coating. Furthermore, the corrosion resistance properties of the composite coating were optimized by tuning the concentration of the added Gr.
研究领域:
材料科学
·
腐蚀与防护
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Cong Chen,Minjie Shi,Yue Zhao,Cheng Yang,Liping Zhao,Chao Yan
Although manganese dioxide (MnO 2 ) is of great promise as the cathode material for aqueous Zn-ion batteries (ZIBs), its capacity decreases sharply during cycles due to the irreversible phase transition and Mn dissolution, consequently hindering the large-scale practical application. Herein, for the first time, a novel Al-intercalation engineering of MnO 2 cathode has been proposed for aqueous ZIBs, in which the structural regulation and Zn 2+ storage performance of Al-intercalated MnO 2 (denoted as AMO) cathode are deeply investigated. Electrochemical testing results indicate significant improvement in specific capacity (401.7 mAh g −1 ) and cycling retention (~94.5% over 2000 cycles) of the AMO cathode, which is owing to the effective Al-intercalation that result in the formation of strong Al-O bonds in tunnel-type MnO 2 framework. This reasonable configuration not only optimizes charge/ion state and electronic bandgap, but also ensures reversible phase transition and alleviates the Mn dissolution of AMO cathode, which are further demonstrated by the density functional theory (DFT) calculations and in-situ Raman investigation upon charging-discharging. As a proof of concept, coin-type and flexible aqueous ZIBs based on such AMO cathode are effectively fabricated, and they both achieve excellent electrochemical behaviors, revealing the great potential applications in energy technologies and portable/wearable electronics.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 104
·60025-60033
·
IF 3.708
Juan Chen,Lihua Jia,Xiangfeng Guo,Lijun Xiang,Shengfeng Lou
A series of KF-modified Ca–Al hydrotalcite (xKF/HTL-M) solid base catalysts was prepared in methanol, and characterized by thermogravimetry analysis (TG-DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM) and carbon dioxide temperature-programmed desorption (CO2-TPD). The catalytic activity was investigated in the transesterification of ethylene glycol monomethyl ether (EGME) with methyl laurate (ML) to produce a novel biodiesel of ethylene glycol monomethyl ether monolaurate (EGMEML). The effect of the mass content of KF and the main reaction parameters such as EGME to ML molar ratio, amount of catalyst, reaction time and temperature on the yield of EGMEML were examined. The results indicate that a new phase of KCaF3 formed in xKF/HTL-M, and acted as the main active sites for the transesterification. In addition, xKF/HTL-M has excellent catalytic performance in the production of EGMEML. The highest yield of 97.7% was obtained over 24.7KF/HTL-M at EGME/ML molar ratio of 3.0, catalyst amount of 5 wt%, and reaction time of 4 h at 120 °C. Moreover, the catalyst displays a good stability and reutilization. A satisfactory yield of 90% was obtained after use for five consecutive cycles without significant deactivation. Finally, the activation energy (Ea) of the reaction of EGME with ML over 24.7KF/HTL-M was obtained as 27.11 kJ mol−1.
研究领域:
化学工程
·
催化材料
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 8
·3768-3789
·
IF 4.5
Dai Guixin,Wu Shiping,Huang Xixi,Wang Mingjie,Wu Ruizhi
According to the design concept of hollow metallic microlattices, the quality of the coating has a considerable influence on the performance of the material. To avoid the effect of by-products in the coatings, we have chosen the Al-induced electroless plating method to respond to the composition design of this material. In this paper, the coatings formation process of Al-induced electroless plating on the metallic surface is systematically investigated. The coatings created by Al-induced electroless plating were characterized by surface morphology, XRD patterns, and electrochemical potential. Subsequently, the deposition process of elements on the metallic substrate was simulated by molecular dynamics. Finally, the surface morphology changes of coatings were observed at different plating times to verify the simulation results. The results indicate that the four kinds of coatings are each composed of a single metal element (copper, cobalt, nickel, and iron) with no by-products. Based on the results of morphology changes of the coatings and the deposition simulation, the overall formation process of Al-induced electroless plating is described. The deposition of coatings has the characteristics of preferential growth and aggregate growth. The metal atoms that are generated from the reaction of the reducing electrons with the target metallic ions in the solutions are deposited on the substrate surface as the primary cores. The reducing electrons are provided by the dissolution of Al foil. With the increase in the number of generated metal atoms, multiple atomic clusters form in the areas of the primary cores. These clusters develop at various scales on the substrate surface, forming irregular particles. Eventually, coatings are formed completely with uniform particle sizes.
研究领域:
材料科学
·
表面工程
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DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 15
·D882
·
IF 3.12
Da-Wei Yang,Ke-Ke Chang,Xiao-Fei Hu,Ya-Lan Liu,Tai-Qi Yin,Shi-Lin Jiang,Mei Li,Wei Han,Zhi-Fang Chai,Wei-Qun Shi
The objective of this work is to explore the electrochemical and electrodeposition behaviors of Eu (III) cation at the liquid binary Al-Ga alloy cathode. In addition, the co-reduction behaviors of Eu (III), Al (III) and Ga (III) were also systematically studied on a W electrode. The results indicated that Eu (III) can be reduced on the binary Al-Ga alloy cathode, and Eu (III), Al (III) and Ga (III) also can be co-reduced on the W electrode to form Al-Eu/Ga-Eu intermetallic compounds. At the same time, the isothermal section phase diagram of the Al-Ga-Eu ternary system at 773 K was also calculated. In addition, Al-Eu and Ga-Eu alloys were prepared by potentiostatic and galvanostatic electrolyses in the LiCl-KCl-EuCl3 melt. Finally, the electrodeposition products were characterized by X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM) coupled with Energy Dispersive Spectroscopy (EDS).
研究领域:
材料科学
·
电化学
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DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Jie Tuo,Jilong Wang,Xianchen Gong,Chengwei Zhai,Hao Xu,Teng Xue,Jingang Jiang,Yejun Guan,Peng Wu
Enriching Al atoms in T2 and T4 sites of FER zeolite is decisive for achieving high catalytic activity in the carbonylation reaction of dimethyl ether (DME). Regulating the spatial position of Al atoms in targeted framework sites remains to be a great challenge during the synthesis of FER zeolite. The FER nanosheets with preferential Al-sitting in T2 and T4 sites were successfully synthesized with the assistance of cetyltrimethylammonium bromide (CTAB). The effect of CTAB on the morphology and Al distribution has been investigated in detail. CTAB mostly adsorbed on external surface serving as growth inhibitors, which resulted in nanosheet morphology and changed the length ratio along the b -axis to c -axis of the crystals. A minor portion of CTAB located in the channels may favor the spatial Al location in T2 and T4 sites, indicated by the results from 27 Al MAS NMR spectra. The FER nanosheets exhibited improved DME conversion, stability, space–time yield (STY), and lifetime compared to conventional FER in DME carbonylation reaction.
研究领域:
催化化学
·
材料科学
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DOI
高影响因子
Waste and Biomass Valorization
·
2016
·Vol. 8
·期 4
·1371-1378
·
IF 0.915
Zhao Wenfeng,Yang Tingting,Li Hu,Lu Yemin,He Jian,Liu Yanxiu,Yang Song
A series of hydroxylated mesoporous aluminum–boron catalysts with different Al/B molar ratios were synthesized through a sol–gel method, and were characterized by XRD, FT-IR, NH 3 -TPD, SEM and N 2 adsorption–desorption techniques. It was demonstrated that hydroxylated Al 2 B 3 containing more Lewis acidity showed superior activity to the other Al – B catalysts in dehydration of glucose to 5-hydroxymethylfurfural (HMF) with a high yield of up to 39.9 % and glucose conversion of 92.1 % at 140 °C for 2 h. The synergistic effect of Lewis and Bronsted acid sites in Al 2 B 3 catalyst was demonstrated to be crucial for efficient conversion of glucose to HMF.
研究领域:
催化化学
·
生物质转化
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DOI
高影响因子
ACS Applied Energy Materials
·
2020
·
IF 4.473
Chao Chen,Yao Sun,Linchun He,Masashi Kotobuki,Emil Hanc,Yu Chen,Kaiyang Zeng,Li Lu
The Garnet-type solid electrolyte Li7La3Zr2O12 (LLZO) showing high ionic conductivity and a wide electrochemical potential window is considered as one of the most promising candidates for solid-state batteries. Among various doping derivatives, the Al- and Ga-doped LLZO electrolytes are intensively studied because of their ability to enhance the stability of the cubic structure and to promote good sinter ability as well. Despite showing great similarities in site preference and sintering behavior, the Al and Ga doping derivatives differ by 1 order of magnitude in total ionic conductivity. Therefore, a comparative study on the doping characteristics of Al and Ga with respect to ionic conductivity and sintering behavior is necessary. Herein, we simultaneously introduced Al and Ga into Li sites (AlxGa0.25–x-LLZO) to study their influences on the microstructure and electrochemical properties of LLZO. The results show that Ga doping enables a higher conductivity than Al doping and largely promotes sinter ability at the same time. Compared to Al single doping (Al0.25), Ga-contained compositions (x < 0.25) show significant grain growth. Moreover, a slight inclusion of Ga (Al0.20Ga0.05) not only modifies the sintering behavior that results in a microstructure transition from fine grains of Al0.25 (5–20 μm) to abnormally large grains (several hundred micrometers) but also greatly enhances the conductivity, yielding a value that is 3 times higher. However, further increases in Ga ratio in AlxGa0.25–x results in marginal increases in conductivity. The total conductivity reaches a maximum of 1.19 × 10–3 S cm–1 for Ga single doping (Ga0.25) at room temperature. In addition, Al0.25 also shows fast ion conducting behavior along the grain boundaries with a conductivity of 8.30 × 10–4 S cm–1. Consequently, this study sheds lights on the different doping characteristics between Al and Ga, providing guidance for fine composition engineering of these two promising dopants.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）