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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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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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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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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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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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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PubMed
高影响因子
Catalysts
·
2025
·Vol. 15
·期 11
·1032
·
IF 4
Jingmo Zhou,Chaoyue Liu,Wenke Zhao,Faizan Ahmad,Yaning Zhang
This study pioneers the application of metal-doped Fe-Al as multifunctional redox catalysts for tunable syngas production from plastics via a microwave-assisted process (CLG). We rationally designed a series of redox catalysts (Ni, Ca, Ce, Sr, Co) to unlock efficient H2-rich syngas production from (high-density polyethylene) HDPE. A class of metal-doping (Ni, Ca, Ce, Sr, and Co) Fe-Al redox catalysts was engineered, with Ni-doped Fe-Al (Ni-Fe-Al) exhibiting the excellent H2-rich syngas production (75.32 mmol/gHDPE syngas, 47.09 mmol/gHDPE H2). This is attributed to the improved redox activity, which facilitates efficient lattice oxygen transfer and catalytic reforming reactions, alongside improved microwave absorption and a porous structure that promotes reactant access. This strategic material design, coupled with process parameter optimization (800 W, redox catalyst/plastic = 2.0), developed a highly efficient HDPE-to-syngas conversion system. The process produced a high-quality syngas (90.03% H2+ CO, H2/CO ratio = 2.27) with a rapid heating rate (233.0 °C/min) and minimal energy input (3.52 kWh/molgas). This work provides not just an effective upcycling route for plastics, but a fundamental blueprint for designing advanced redox catalysts to unlock the full potential of microwave-CLG.
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MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2025
·
IF 7
Ming Yang,Zhenyu Wei,Ruifen Guo,Tong Che,Ping Shen
The performance comparison between uniformly dispersed and bioinspired architectures in metal matrix composites has long been limited by the absence of rigorously controlled experimental validation. To address this gap, this study employed a carbon fiber-assisted gelcasting method to fabricate crack-free, low-volume-fraction (31.2 vol.%) uniform SiC preforms. They were compared against laminated SiC preforms (∼30 vol.%) prepared via freeze casting, with both architectures densified by aluminum infiltration under identical conditions. The results demonstrate that the laminated structure achieves a remarkable strength–toughness synergy, with its flexural strength and fracture toughness enhanced by 7.3% and 18.2%, respectively, compared with the uniform structure. This improvement is attributed to a transition in the toughening mechanism from an intrinsic to an extrinsic mechanism dominated by crack bridging, highlighting that spatial configuration constitutes a critical performance-regulating dimension beyond traditional compositional design, and offering a new paradigm for the development of high-performance composites.
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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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SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Ruijie Xu,Xingyao Li,Xiaolun Peng,Junhui Xu,Yazhen Wang
In this paper, two Al-MOFs, named as MIL-53(Al) and NH 2 -MIL-53(Al), have been synthesized using aluminum ions as metal center and terephthalic acid, 2-aminoterepthalic acid as organic ligands in aqueous medium, respectively. Then, these two materials were utilized to construct the electrochemical sensor for the detection of neohesperidin dihydrochalcone (NHDC). The X-ray diffraction (XRD), scanning electron microscopy (SEM), fourier transformation infrared spectra (FT-IR), brunauer-emmett-teller (BET) and X-ray photoelectron spectra (XPS) were used to characterize the microstructure and morphology of two Al-MOFs materials. Compared with the MIL-53(Al) modified electrode, the NH 2 -MIL-53(Al) electrode proved a superior catalytic effect for the redox of NHDC. Thereafter, the electrochemical redox behavior and mechanism of NHDC at the NH 2 -MIL-53(Al) modified electrode were evaluated by cyclic voltammetry (CV), and the adsorption mechanism between the NH 2 -MIL-53(Al) materials and NHDC was revealed by density functional theory (DFT) calculations. Under the optimal detection conditions, a fast and sensitive strategy for detecting NHDC was constructed by differential pulse voltammetry (DPV). The linear range of NHDC based on this method was 0.08–30.0 μmol/L with R 2 = 0.9969. The low limit of detection (LOD) is 17.2 nmol/L for NHDC. Additionally, the NH 2 -MIL-53(Al) modified electrode demonstrated its applicability to the determination of NHDC in mud film samples with recoveries of 98.6–99.9 %. The consequences were in great accordance with high-performance liquid chromatography (HPLC), implying the feasibility of the proposed method for the detection of NHDC in actual samples.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Kai Fan,Shuo Liu,Ye Ma,Qinming Wu,Sen Wang,Andree Pauschinger,Andrei-Nicolae Parvulescu,Nils Bottke,Toshiyuki Yokoi,Dirk E. De Vos,Xiangju Meng,Weiping Zhang,Feng-Shou Xiao
ITR zeolites exhibited excellent performance in methanol to propylene (MTP), where an important factor was the Al distribution of the ITR zeolites. However, optimization of the Al location in ITR zeolites in the conventional synthesis is challenging. In this work, the Al distribution in the ITR zeolites was efficiently adjusted by adding boron species in the synthesis gels due to the competitive occupancy of T sites in zeolites between boron and aluminum species. The obtained ITR with different boron content zeolites displayed similar nanosheet morphology, textural parameters, and strong acidic concentration but characterizations of Al distribution showed that the addition of boron species led to more Al species distributed in a relatively small sinusoidal channel and less Al species located in an intersection cavity. As a result, the aromatic cycle would be effectively suppressed due to the steric configuration of large aromatic cycle intermediates, whereas the alkene cycle will be enhanced correspondingly. As expected, catalytic tests in the conversion of MTP showed that the new ITR zeolites exhibited enhanced propylene selectivity and catalyst lifetime with the incorporation of boron species, which was attributed to different Al distribution in these ITR zeolites.
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