IONICS
·
2020
·Vol. 26
·期 4
·1787-1795
·
IF 2.394
Ge Zhi,Li Jie,Liu Jin
A flexible PEO-NaCF 3 SO 3 -MIL-53(Al) solid electrolyte is fabricated for all-solid-state sodium-sulfur batteries (ASSBs). When the mole ratio of EO (ethylene oxide of PEO):Na (sodium ion of NaCF 3 SO 3 ) is 20 and MIL-53(Al) is 3.24 wt%, high ionic conductivities of 6.87 × 10 −5 S cm −1 at 60 °C and 6.52 × 10 −4 S cm −1 at 100 °C are achieved. And the sodium ion transference number is significantly increased to 0.40 from 0.13 compared to the PEO-NaCF 3 SO 3 solid electrolyte without MIL-53(Al). When it is assembled to ASSBs, the batteries obtain high capacity retention and reversible current-rate capability. At 0.1 C and 60 °C, the solid-state battery delivers the first discharge capacity of 897.7 mAh g −1 and 674.9 mAh g −1 after 50 cycles with a coulombic efficiency near 100%. The enhanced electrochemical performances of the solid electrolyte, as well as ASSBs, are benefited from MIL-53(Al) filler.
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ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY
·
2016
·Vol. 23
·期 1
·113-120
·
IF 1.87
Chen Hongyin,Ding Jing,Wang Weilong,Wei Xiaolan,Lu Jianfeng
Post modification methods were used to synthesis MCM-41 with different pore sizes, modified by Al grafting and cation doping. Water adsorption characteristics were measured by dynamic water vapor adsorption and analyzed regarding equilibrium and kinetics. Results showed that Al grafting and cations doping modifications on MCM-41 changed water adsorption characteristics. Doped cations strengthened the water adsorption capacity at low RH following the order of Al–C12–Mg > Al–C12–Li > Al–C12–Na. Kinetics analysis indicated that capillary condensation process developed slowly due to low diffusion constant. But the adsorption transient uptake rates in capillary condensation sections were larger compared to other sections, Larger RH step not only resulted in larger uptake rate, but also promoted capillary condensation. Instead of calculating or measuring isotherms and diffusion coefficients respectively, parameters like transient uptake rate corresponding to the effects of both transport ability and adsorption capacity should be considered.
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JOURNAL OF APPLIED PHYSICS
·
2021
·Vol. 129
·期 5
·
IF 2.546
Jiao Yan,Guo Mengting,Wang Renle,Shao Chongyun,Hu Lili
In this study, Er 3+ /Al 3+ co-doped silica glasses with various Al/Er ratios ranging from 0 to 200 and a constant Er 2 O 3 amount were prepared using the sol-gel method combined with high-temperature vacuum sintering. The absorption, emission spectra, and fluorescence lifetime of Er 3+ ions were recorded and the absorption and emission cross sections were calculated. Using Raman, 27 Al and 29 Si magic angle spinning nuclear magnetic resonance (MAS-NMR), 27 Al triple-quantum (TQ)-MAS-NMR, and electron paramagnetic resonance (EPR) spectroscopies, the physical and optical properties were correlated with the glass structural modifications due to the Al/Er ratio change. With the increase in the Al/Er ratio, the content of Al 3+ ions around the Er 3+ ions gradually increased. Meanwhile, the AlO 5 and AlO 6 polyhedrons increased at the expense of the AlO 4 and SiO 4 tetrahedrons, which resulted in an improved symmetry and better ionic Er–O bonds. These structural changes led to the site-to-site variations in the Er 3+ local environment and the changes in the ligand field strength of the Er–O bonds. This, in turn, resulted in the inhomogeneous broadening of the absorption and emission spectra, with a blue shift of both absorption and emission peaks and a decrease in both absorption and emission at 1.53 μ m. With the increase in Al/Er ratio, the full width at half maximum (FWHM) of the emission increased from 27.2 to 54.3 nm. The FWHM × emission cross section ( σ e m i ) parameter for evaluating broadband amplification behavior was 30.1 × 10 −20 cm 2 · nm. This work reveals the close relationship between the glass structure and the spectroscopic properties of Er 3+ ions and provides an important reference for the design of broadband amplifier materials in the field of optical communication.
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ACS Applied Energy Materials
·
2022
·
IF 6.959
Bo Zhang,Yongsheng Li,Yongji Chen,Haibiao Chen,Chen Zhu,Jian Liu,Yuan Lin,Feng Pan
The efficiency of silicon solar cells is largely affected by the quality of the front and back metallic contacts. In this work, MoO3 is added to the Al paste for the back contact of crystalline silicon solar cells. The MoO3 additive lowers the series resistance of the solar cell from 4.1 to 3.5 mΩ and increases the photoelectric conversion efficiency from 19.26 to 19.54%. We identify that the thermite reaction between MoO3 and Al takes place at about 800 °C and metallic Mo diffuses into the Al–Si solid layer, decreasing the barrier height between Al and Si and lowering the contact resistance. This work demonstrates an approach by optimizing the aluminum-back surface field (Al-BSF) in the back metallic contact of crystalline silicon solar cells to enhance the performance of the cell.
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Nano Research
·
2021
·Vol. 15
·期 2
·1310-1318
·
IF 8.897
Ullah Sami,Liu Yu,Hasan Maria,Zeng Wenwen,Shi Qitao,Yang Xiaoqin,Fu Lei,Ta Huy Q.,Lian Xueyu,Sun Jingyu,Yang Ruizhi,Liu Lijun,Rümmeli Mark H.
Graphene doping continues to gather momentum because it enables graphene properties to be tuned, thereby affording new properties to, improve the performance of, and expand the application potential of graphene. Graphene can be chemically doped using various methods such as surface functionalization, hybrid composites (e.g., nanoparticle decoration), and substitution doping, wherein C atoms are replaced by foreign ones in the graphene lattice. Theoretical works have predicted that graphene could be substitutionally doped by aluminum (Al) atoms, which could hold promise for exciting applications, including hydrogen storage and evolution, and supercapacitors. Other theoretical predictions suggest that Al substitutionally doped graphene (AlG) could serve as a material for gas sensors and the catalytic decomposition of undesirable materials. However, fabricating Al substitutionally doped graphene has proven challenging until now. Herein, we demonstrate how controlled-flow chemical vapor deposition (CVD) implementing a simple solid precursor can yield high-quality and large-area monolayer AlG, and this synthesis is unequivocally confirmed using various characterization methods including local electron energy-loss spectroscopy (EELS). Detailed high-resolution transmission electron microscopy (HRTEM) shows numerous bonding configurations between the Al atoms and the graphene lattice, some of which are not theoretically predicted. Furthermore, the produced AlG shows a CO 2 capturability superior to those of other substitutionally doped graphenes.
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ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Qi Zou,Qichi Le,Xingrui Chen,Yonghui Jia,Chunyan Ban,Tong Wang,Henan Wang,Ruizhen Guo,Liang Ren,Andrej Atrens
This paper investigates the microstructure, corrosion, electrochemical behavior, and the discharge performance of Gallium (Ga) alloyed Mg-Al-Zn alloys using the gravimetric method, electrochemical measurements, and battery test. The average grain size of AZ80–2.5Ga (Mg-8Al-0.5Zn-2.5Ga alloy) is 36% smaller than that of AZ80 (Mg-8Al-0.5 Zn alloy). The number and size of the Mg 17 Al 12 phase particles are smaller and more homogeneously distributed. Ga reduces the self-corrosion rate, increases the electrochemical activity and the discharge performance. The grain refinement generates many grain boundaries on the surface and promotes discharge performance. The decrease of the self-corrosion rate is attributed to the suppression of the protective film that inhibits the anode consumption. The AZ80–2.5Ga anode has the optimal discharge capacity of 1437 mAh g − 1 and anode efficiency of 61% at 50 mA cm −2 , which are 25% and 29% higher than for the AZ80 anode.
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PROGRESS IN ORGANIC COATINGS
·
2022
·
IF 6.206
Xinchen Han,Ning Li,Bo Wu,Deyu Li,Qinmin Pan,Rui Wang
Chromate-phosphate/water-soluble resin composite conversion coatings (CP/RC) were prepared on the aluminum surface through a non-washing, dip coating-baking chemical conversion treatment method. Chromate-phosphate conversion film (CP) and water-soluble resin conversion film (RC) were also prepared for comparison studies. The CP/RC surface was found to be the most homogeneous, with the strongest protection against aluminum , and was not corroded during a 20-day neutral salt spray (NSS) test and a 3.5 wt% NaCl immersion test. The analysis shows that CP/RC is mainly composed of three parts: the outermost covering layer with the resin as the main body (polymer, AlPO 4 , CrO 3 and Cr 2 O 3 ); the internal composite conversion layer composed of resin and inorganic skeleton (Al 2 O 3 , Cr 2 O 3 , CrO 3 , AlPO 4 , CrPO 4 , Al, AlF and polymer); the surface layer of aluminum substrate (Al, Al 2 O 3 and AlPO 4 ). XPS also shows that Cr 6+ reacts with resin to form related compounds, which proves that the resin component and inorganic component in the coating are compounded.
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ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Yupeng Wang,Xiangyuan Yu,Shulong Wen,Yihu Sun,Huibin Wei
The effective and economical removal of heavy metal-organic complexes remain an urgent challenge in the field of industrial wastewater treatment. In this study, Ca-doped ferrihydrite composites and Ca/Al co-doped ferrihydrite composites were synthesized via a simple one-step co-precipitation method and applied for the oxidative removal of EDTA-Cu in a hypochlorite system. The incorporation of Al significantly enhanced the material's stability. The Fe-Ca-Al composite exhibited a catalytic degradation efficiency of 97 % after 4 reaction cycles, representing a 32 % improvement compared to the Ca-doped ferrihydrite (Fe-Ca). Mechanistic studies revealed that the Fe-Ca-Al composite demonstrated strong selective adsorption of the organic moieties in EDTA-Cu over a broad pH range. Moreover, the oxygen vacancies (Ov) induced by Ca and Al co-doping played a crucial role in the enhanced catalytic performance and efficient removal of EDTA-Cu. These abundant Ov promoted electron transfer and provided numerous surface adsorption sites, facilitating the conversion of O 2 · - to 1 O 2 . Given that 1 O 2 can rapidly degrade organic compounds containing amino and carboxyl groups, it shows excellent potential for the treatment of EDTA-Cu. This study presents a highly active and reusable catalyst based on a Ca-Al doping strategy, offering a promising approach for the removal of organic-heavy metal complexes.
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yuxuan Zhou,Keer Ouyang,Yongqi Da,Lingyan Shen,Zhengwu Dong,Zhuotao Song,Jingjie Wang,Xiaoxue Tan,Xiaohong Jiang,Xuran Xu,A.V. Rogachev,D.G. Piliptsou,A.A. Rogachev,M.A. Yarmolenko,Jianbing Xu,Yinghua Ye,Ruiqi Shen
Energetic interfacial films represent a promising encapsulation material for micro- thruster arrays in near-Earth orbit, where their combustion performance under low- pressure or vacuum conditions is critical for practical application. Herein, a uniformly dispersed layered energetic composite film suitable for scalable array encapsulation has been designed via electrospinning technology. The ternary composite energetic film consists of interwoven polyvinylidene fluoride/aluminum/copper oxide (PVDF/Al/CuO) nanofibers. Morphological analysis confirms the effective loading of nanoparticles (Al and CuO) onto the fibers. Energetic films fabricated by this method significantly suppress particle agglomeration. Thermal analysis reveals atmosphere-dependent exothermic pathways. Constant-volume combustion experiments demonstrate that energy release is modulated by film thickness. The evolution of the film ablation flow field has been investigated. Crucially, transient resistance thermometry has for the first time reported the phenomenon of increasing ignition temperature of energetic materials with decreasing pressure under low-pressure conditions. At 1 kPa, the ignition temperature is significantly elevated compared to that at atmospheric pressure. Propagation velocity characterization uncovered a counterintuitive phenomenon: below 10 kPa, 610 μm-thick films exhibit a 42% lower propagation velocity than 270 μm-thick films, a phenomenon termed the thickness-compensation failure effect. An asymmetric heat transfer-dissipation theory is proposed to explain this inversion through geometric thermal management. This work provides crucial experimental evidence and a theoretical foundation for guiding the design of energetic films for vacuum-operating micro-thruster array encapsulation.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Wenting Zhou,Yongkang Huang,Xiaofeng Gao,Zixuan Ma,Ziyu Song,Lili Lin,Ding Ma,Siyu Yao
Pt/α-MoC catalysts, synthesized by supporting platinum on α-phase molybdenum carbide (α-MoC), have emerged as promising candidates for the low-temperature water–gas shift reaction (WGSR) due to their high catalytic activity. However, their performance is often limited by insufficient density of active Pt–Mo interfacial sites and inadequate stability under reaction conditions. In this study, a ternary Pt/α-MoC/MFI catalyst was constructed by incorporating MFI-type zeolites with varying Si/Al ratios as a support component. Comprehensive characterization revealed that modulating the Si/Al ratio of the zeolite support alters the carburization process, with silica-rich supports promoting the formation of a more optimal molybdenum carbide structure and effectively suppressing carbon deposition during reaction. In addition, the use of high-silica supports increased the number of active Pt–Mo interfacial sites and enhanced key steps such as water dissociation and –OH group conversion. Consequently, the Pt/α-MoC/S-1 catalyst─synthesized using purely siliceous S-1 zeolite as the support─exhibited the highest intrinsic activity of 7.4 molCO/molPt/s at 523 K, outperforming all other zeolite-supported Pt/α-MoC catalysts as well as the bulk Pt/α-MoC catalyst.
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Catalysts
·
2021
·Vol. 11
·期 2
·162
·
IF 4.146
Huayin Li,Yuan Tan,Xingkun Chen,Wenshao Yang,Chuanqi Huang,Jie Li,Yunjie Ding
Methyl methacrylate (MMA) is an important monomer in fine chemicals. The synthesis of MMA by one-step oxidative esterification from methacrolein with methanol over a heterogeneous catalyst with high activity, selectivity and stability is highly desirable. Herein, Zn-Al-hydrotalcites (HTs)-supported atomically precise Au25nanoclusters with different molar ratios of Zn2+/Al3+were prepared and used as the precursors for this reaction. They exhibited good performances in comparison with the gold catalysts prepared by the deposition precipitation method. The structural and electronic properties were evaluated by various characterization technologies, including X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), in situ diffuse reflectance infrared Fourier-transform spectroscopy (DRIFTS) of CO adsorption, X-ray photoelectron spectroscopy (XPS), and CO2temperature-programmed desorption (TPD). The combined characterization results suggested that the adsorption property of gold and the basicity of the catalyst contributes to their high activities. Substrates extended experiments and stability tests implied the potential application of Zn-Al-mixed oxides supported gold catalysts, which paves a new way for supported gold catalyst in the one-step oxidation esterification reaction.Keywords:gold cluster;hydrotalcite;methacrolein;methyl methacrylate;oxidative esterification
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CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Lilong Zhang,Keli Chen,Liang He
A strategy to realize a reinforced photothermal stability cellulose nanofibrils (CNFs) films was reported. The LDHs were dispersed homogeneously onto the active site of CNFs surface by electrostatic self-assembly and the Mg/Al LDHs armour-type nanofibrils were prepared. After simple vacuum filtration, this kind nanofibrils can fabricate highly ordered multilayer film. Suitable amount of additive can bring outstanding photo-thermal property. The visible-light transmittance of the composite films can reach to c.a 80.0% when addition was 0.1% wt. and folding strength of the films contained 0.5% wt LDHs can increased by 15 times. The strength and the light transmittancevery of composite films was also higher than the pure nanocellulose film with the photothermal radiometry for about 30 h under 60 °C drying condition. The production is simple and highly repeatable process could be a good reference for preparation of high photothermal stability and transparent CNFs-based thin films.
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