查找使用阿拉丁产品的科研文献

Modulating Solvation Structure and Desolvation Dynamics of Hydrate Eutectic Electrolytes for Cost-Effectiveness, Ultralong Cyclability, and High Reversibility of Zn–Al Alloy Anode

Yujie Fu,Jiagui You,Quanhuan Yao,Cong Tian,Lingyu Wang,Peiyang Shi,Guilong Yan,Liujun Cao

Aqueous aluminum-ion batteries (AAIBs) hold significant promise for scalable grid energy storage because aluminum (Al) anodes offer advantages such as abundant reserves in the earth’s crust, low cost, high capacity, and environmental friendliness. However, the widespread adoption of AAIBs is currently limited by aluminum trifluoromethanesulfonate (Al(TOF)3) salt-based aqueous electrolytes, which are both expensive and environmentally problematic. To address this limitation, we introduce a novel hydrated eutectic electrolyte (HEE) composed of hydrated aluminum sulfate (Al2(SO4)3 · 18H2O) as the solute and ethylene glycol (EG) as the solvent, notably costing approximately 1/15th the price of Al(TOF)3. This HEE leverages strong coordination between EG molecules and Al3+ ions, facilitated by hydrogen bonding and solvation effects, to promote more uniform aluminum deposition and suppress dendrite formation on zinc substrates compared to conventional aqueous Al2(SO4)3 electrolytes. Consequently, the formation of anionic/cationic complex species reduces interfacial impedance, enabling a highly reversible aluminum plating/stripping process characterized by low overpotentials (∼130 mV) and an extended cycle life of up to 2000 h. Furthermore, when incorporated into a full cell using a Zn–Al anode and a phosphorus-doped V2O5 (P–V2O5) cathode, this HEE demonstrates excellent rate capability and cycling stability. This work provides new opportunities for constructing high-performance and low-cost AAIBs for practical applications.

Advantages of electrospray fabrication on the surface, microstructure and combustion characteristics of energetic composites of Al powders encapsulated in PVDF/WO₃ hybrid shells

Zhong-xuan Han,Hao Liu,Zhan-jun Yang,Yi Wu,Lin-xuan Zhu,Shu-na Zhao,Mi Li,Lin Jiang,Andrei Rotaru,Qiang Xu

Electrospray deposition was used to create concentric polyvinylidene fluoride/tungsten oxide (PVDF/WO₃) shells on aluminum (Al) powders spanning two size regimes (nano-Al, ≈ 87 nm; micro-Al, ≈ 20 μm). Transmission-electron microscopy shows that nano-Al acquires a uniform 5.5 nm-thick polymer/oxide coating, whereas micro-Al develops a discontinuous fibrous layer several hundred nanometers thick. These contrasting morphologies govern the energetic response. By comparing nano- and micro-scale Al cores and contrasting electrosprayed and ball-milled composites, the study elucidates how shell morphology governs the transient thermal processes of laser ignition, heat release and flame development. In laser-ignition tests, the nano-Al electrosprayed composite (NC) exhibited the shortest ignition delay of 42 ± 3 ms and reached a peak flame temperature of 2500–2700 °C, producing a narrow, self-sustaining jet; the corresponding ball-milled sample (NM) showed an ignition delay of 85 ± 5 ms and peaked at ~1500 °C, while the micro-Al electrosprayed material (MC) had an ignition delay of 156 ± 8 ms, plateaued at ~1107 °C, and failed to maintain combustion. The ball-milled micro-Al sample (BM) could not be ignited under the same conditions. Differential-scanning-calorimetry combined with Kissinger analysis revealed markedly different apparent activation energies for the first exothermal process (NC: 171 kJ/mol; NM: 63 kJ/mol; MC: 91 kJ/mol; ball-milled micro-Al, MM: 21 kJ/mol), underscoring the sensitivity of the initial Al–WO₃ reaction to coating continuity and diffusion distance. Overall, electrospraying reduces ignition delay by approximately 50 % compared to ball-milled samples, intensifies heat release, and maximizes flame temperature when the aluminum core is in the nano-scale regime. The resulting activation energies, ignition delays, flame speeds and peak temperatures provide thermal-design data for high-temperature heat-source layers in micro-thrusters, gas generators and other compact thermal-engineering devices, in addition to advanced propulsion or pyrotechnic applications.

Promoting the ignition and combustion performance of Al/CL-20/AP solid propellant by synergistic effects of graphene-based catalysts and interfacial control

Zhiyuan Feng,Yunjie Liu,Yajing Xiao,Yunlong Zhang,Ruixuan Xu,Qi-Long Yan,Hongqi Nie

s High burning rate pressure exponent and incomplete combustion of Al constrains the further application of the composite propellant containing CL-20. In this study, various Al@CL-20 composites constructed by spray-drying method were applied to modify the HTPB/AP/Al/CL-20 propellant through interfacial control and synergistic effect of catalysts (GO CHZ-M, M =Co 2+ or Ni 2+ ) without changing the propellant formulations. The results show that the modified propellant have a greater heat of reaction (5977 J g -1 , increased by 7.3 %), a reduced ignition delay time of 477 ms, an 32.1 % increase in the burning rate at 1 MPa, and the pressure exponent decreased from 0.49 to 0.15 within 0–2 MPa (about 69.4 % reduction), the mechanism can be attributed to the catalytic decomposition of CL-20 and AP by the presence of GO CHZ-M. Moreover, the agglomeration of Al was remarkably inhibited by interfacial control and precise catalysis, the proportion of condensed phase combustion products with particle size larger than 10 μm decreased from 35.1 % to 23.4 %, while the active Al content in the products declined significantly, indicating that the combustion efficiency of the propellant was greatly improved.

Hydrogen production via catalytic propane partial oxidation over Ce1-xMxNiO3-λ (M=Al, Ti and Ca) towards solid oxide fuel cell (SOFC) applications

Ji Qi,Mingzheng Liao,Chao Wang,Zhiqiang Jiang,Ying Chen,Bo Liang,Qingbin Song

Indirect hydrogen production routes presented extensive compatibilities for distributed solid oxide fuel cell systems . Catalyst activity directly determines hydrogen production and profoundly affects the power generation . In this work, Ce 1-x M x NiO 3-λ (M = Al, Ti and Ca) were synthesized for hydrogen production from propane partial oxidation (POx). From the results, it indicated that the choice of catalyst compositions could directly affect the microstructure during the preparation process. Also, different Ce 1-x M x NiO 3-λ catalysts displayed distinctive carbon tolerance performances due to the different active particle sizes and surface properties of the catalysts. In general, the synthesized Ce 1-x M x NiO 3-λ catalysts showed higher hydrogen production than a commercial nickel cerium catalyst. From the observation of a SOFC test system powered by injecting the generated H 2 from catalytic propane POx reaction, the obtained power density of CNO–Al displayed an increase of 22.6% compared to the commercial nickel cerium catalyst. It was quite impressive that the equivalent hydrogen (160 ml/min) produced over CNO–Al and the obtained power density (482.6 mW/cm 2 ) of SOFCs were competitive while CNO–Ca presented an excellent stability with a better carbon tolerance performance for the long-term tests. The achievements of this work might offer a novel point of view for developing low-cost catalyst towards indirect hydrogen production for SOFC.

Ag substituted Au clusters supported on Mg-Al-hydrotalcite for highly efficient base-free aerobic oxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid

Zongyang Liu,Yuan Tan,Jie Li,Xiuli Li,Yan Xiao,Juan Su,Xingkun Chen,Botao Qiao,Yunjie Ding

Aerobic oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) is a promising alternative route to produce renewable biodegradable plastics, which has stimulated intense interest in recent years. Supported gold catalysts have shown great potential for this reaction, but the selectivity and stability need to be improved. In addition, the requirement for base additives makes the process less effective and sustainable. Herein, highly active and selective Au–Ag bimetallic nanoclusters supported on MgAl-hydrotalcite (HT) were developed for HMF oxidation to FDCA under base-free reaction conditions using molecular oxygen as the oxidant. The presence of small amounts of Ag (0.034–0.065 wt%) in Au25 clusters greatly enhanced the catalytic reaction rates and selectivity for HMF tandem oxidative steps, leading to both high conversion of HMF (>97%) and high yield of FDCA (>95%). Besides, the catalyst stability was also enhanced by the addition of Ag. The characterization results suggested that the substitution of Ag atoms modified the electronic structure of Au while likely maintaining the primary geometry. Thus, a significant synergistic effect could be observed over trace Ag modified Au–Ag bimetallic nanoclusters. The present work provides new insight into the alloying effect, and helps understand highly efficient Au-based catalysts for aerobic oxidation of biomass derived molecules under base-free conditions.

Regulating the Si/Al ratio of g-C3N4/HBeta to improve adsorption and catalytic activity for enhancing photocatalytic pollutant degradation and H2 production

RuoKun Jia,PengPeng Wang,XiaoHang Yang,DuMin Li,JianGuo Qiao,TianXiang Li,JiaHui Chen

The rational modulation of the Si/Al ratio within molecular sieves holds utmost significance for augmenting photocatalytic activity. In this context, g-C 3 N 4 /HBeta composite photocatalysts were synthesised via a straightforward in situ thermal polymerisation procedure employing HBeta molecular sieves possessing multiple active sites and diverse Si/Al ratios. Through the variation of Si/Al ratios, the adsorption capacity, photogenerated carrier complexation efficiency, and active site characteristics could be effectively manipulated. The catalyst with the smallest Si/Al ratio (HBeta 25 ) exhibited the highest catalytic activity, with a hydrogen production efficiency of 2.346 mmol g⁻¹. This value was 4.9 times higher than that of pure g-C 3 N 4 , and the degradation efficiency of RhB was 3 times that of pure g-C 3 N 4 . The catalytic proficiency was principally validated by employing a comprehensive suite of techniques, including XPS, BET, SEM, and NH 3 -TPD. Our results demonstrate for the first time the strong potential of zeolite Si/Al ratio to modulate the catalytic activity of photocatalysts.

Zn–Al LDH nanosheets exfoliated in a LiOH/urea solution in situ: an effective strategy for fabricating cellulosic fibres with enhanced mechanical properties

Zhang Shanbei,Chen Zanmei,He Hongwei,Jiang Yijun

The alkali/urea system is an economical and environmentally friendly solvent system for dissolving cellulose. However, the mechanical performance of cellulose derived materials (such as fibres or films) treated with alkali/urea must be improved. The capacity of this system for cellulose dissolution is limited and the mechanical properties of the regenerated cellulose fibres are still unsatisfactory. Here, cotton linter pretreated with peracetic acid (PAA) was dissolved in a LiOH/urea aqueous suspension in which Zn–Al layered double hydroxide (Zn–Al LDH) nanosheets (NS thickness = 3 nm) were exfoliated in situ. After wet spinning, the strength and toughness of the regenerated cellulose fibres reached 290 ± 7.66 MPa and 23.5 ± 4.40 MJ/m 3 respectively, which were 66.7% and 150% higher than those without the LDH NS treatment. It is interesting to note that the synergistic effect of Zn 2+ and Al 3+ distributed on the surface of the LDH host layer significantly improved the solubility of cellulose at low temperature and the interaction between the cellulose and LDH NSs also improved the mechanical performance. This work provides a strategy for improving both the solubility of cellulose in the alkali/urea system and the mechanical properties of regenerated cellulose fibres. Graphical abstract

Characterization and thermal insulation of Mg(-Al/Zr)-Si oxide fibers prepared by dual-source precursor of magnesium citrate complex combined with chlorides

Xiaojing Liu,Chonghe Xu,Lin Wang,Rongchao Jiang,Liguang Yang,Wenyu Yang,Xuetao Yue

Ceramic fibers have emerged as a promising candidate for advanced thermal insulation applications due to their exceptional thermomechanical properties and chemical resistance. In this work, Mg(-Al/Zr)-Si ceramic fibers were successfully prepared via electrospinning technology using a dual-source precursor strategy, combining magnesium citrate complex and metal chlorides as metal oxides precursors. The crystalline phase formation, thermal decomposition behavior, microstructure, and properties of the fibers were systematically investigated using X-ray diffraction (XRD), thermogravimetric-differential scanning calorimetry (TG-DSC), Fourier transform infrared spectroscopy (FT–IR), and scanning electron microscopy (SEM). The heterogeneous sol precursor notably influenced the fiber crystallization process and facilitated more gradual thermal decomposition, as evidenced by reduced weight loss rates. Consequently, the Mg(-Al/Zr)-Si ceramic fibers maintained good structural integrity after exposure to 1200 °C. Moreover, the incorporation of aluminum or zirconium enhanced the tensile strengths of fibers (heat treated at 800 °C) to 1.56–1.79 MPa, representing a significant improvement over pure magnesium silicate fibers. Furthermore, the fibers exhibited good thermal insulation performance with low room-temperature thermal conductivity values ranging from 0.0282 to 0.0333 W·m −1 ·K −1 , further highlighting their suitability for high-temperature insulation applications. These findings underscore the significant potential of the developed fibers for use in high temperature thermal management and insulation systems.

Mg-Al-hydrotalcite with alkaline sites protects Ni/KIT-6 from formation of amorphous coke in glycerol steam reforming via tailoring reaction intermediates

Guo Yunyu,Wang Yiran,Shao Yuewen,Zhang Shu,Wang Yi,Hu Song,Xiang Jun,Hu Xun

During steam reforming, the performance of a catalyst and amount/property of coke are closely related to reaction intermediates reaching surface of a catalyst. Herein, modification of reaction intermediates by placing Mg-Al-hydrotalcite above Ni/KIT-6 catalyst in steam reforming of glycerol was conducted at 300 to 600 °C. The results revealed that the catalytic activity of Ni/KIT-6 in the lower bed was enhanced with either Mg 1 -Al 5 -hydrotalcite (containing more acidic sites) or Mg 5 -Al 1 -hydrotalcite (containing more alkaline sites) as upper-layer catalyst. The in situ infrared characterization of steam reforming demonstrated that Mg-Al-hydrotalcite catalyzed the deoxygenation of glycerol, facilitating the reforming of the partially deoxygenated intermediates over Ni/KIT-6. Mg-Al-hydrotalcite as protective catalyst, however, did not protect the Ni/KIT-6 from formation of more coke. Nonetheless, this did not lead to further deactivation of Ni/KIT-6 while Mg 5 -Al 1 -hydrotalcite even substantially enhanced the catalytic stability, even though the coke was much more significant than that in the use of single Ni/KIT-6 (52.7% vs. 28.6%). The reason beneath this was change of the property of coke from more aliphatic to more aromatic. Mg 5 -Al 1 -hydrotalcite catalyzed dehydration of glycerol, producing dominantly reaction intermediates bearing C=C, which formed the catalytic coke of with carbon nanotube as the main form with smooth outer walls as well as higher aromaticity, C/H ratio, crystallinity, crystal carbon size, thermal stability, and resistivity toward oxidation on Ni/KIT-6 in the lower bed. In comparison, the abundance of acidic sites on Mg 1 -Al 5 -hydrotalcite catalyzed the formation of more oxygen-containing species, leading to the formation of carbon nanotubes of rough surface on Ni/KIT-6.

Correction: Wang et al. Electrochemical Activation of Natural Magnesite for Phosphorus Recovery from Wastewater via In Situ Struvite Crystallization. Molecules 2026, 31, 3047

Zepeng Wang,Peidong Su,Chunhui Zhang,Weilong Zhou,Xiaoping Zhong,Guifeng Zhao,Zaining Li,Bingxu Quan

Enhanced corrosion protection mechanism of BTA-loaded MIL-53-NH2 (Al)@diatomite composites for carbon steel rock bolts in simulated mine leach liquor

Qianxun Liu,Jiawei Ding,Chaowei Wang,Hao Fu,Xuetong Yang,Sitao Zhu,Hongyu Zhao,Yang Hu

MNA@DE composites were fabricated via in situ growth with high BTA loading capacity. MNA@DE composites were fabricated via in situ growth with high BTA loading capacity. • BTA-MNA@DE-M showed excellent corrosion-inhibition performance in simulated mine leach liquor. • MNA@DE exhibited pH-responsive BTA release for sustained inhibition of carbon steel corrosion. To address the susceptibility of carbon steel rock bolts to corrosion in complex mine environments and the limited long-term protection provided by conventional corrosion inhibitors, MIL-53-NH 2 (Al)@diatomite composites were prepared via in situ hydrothermal growth. The corrosion-inhibition performance of the benzotriazole (BTA)-loaded composites for carbon steel rock bolts in simulated mine leach liquor was systematically investigated. MNA@DE exhibited a considerably higher BTA adsorption capacity than pristine diatomite, with MNA@DE–H showing the highest value (134.48 mg g −1 ) at pH 5.0. Electrochemical measurements indicated that 0.10 wt% BTA-MNA@DE-M exhibited the best corrosion-inhibition performance, with a corrosion current density of 1.76 μA cm −2 and a polarization-based inhibition efficiency of 82.94%. The R ct -based inhibition efficiency increased from 20.77% to 87.56% over 168 h, indicating that the corrosion-inhibition performance of the material steadily improved with increasing of immersion time. Mechanistic analysis revealed that under weakly acidic conditions, hydrogen bonding and cation–π interactions between the surface - NH 3 + groups in the composites and BTA facilitated the efficient loading and immobilization of BTA. In a weakly alkaline simulated mine leach liquor, BTA molecules were slowly released because of weaker interactions between the carrier and BTA. The released BTA was subsequently adsorbed on the carbon steel surface, suppressing interfacial charge transfer and thereby progressively enhancing the corrosion-inhibition performance with the extension of immersion time. Therefore, this study provides a new strategy for the design and development of long-lasting corrosion-inhibiting materials for carbon steel rock bolts in complex mine environments. Slow release of BTA in weakly alkaline mine leach liquor enables sustained adsorption on carbon steel, suppresses charge transfer, and provides long-term corrosion protection. Download: Download high-res image (260KB) Download: Download full-size image

Nonlinear Modeling of Luminescence-Pressure Behavior: A Case Study Using (Y,Gd)(Al,Ga)3(BO3)4:Cr3+ Phosphors for Optical Pressure Sensing Applications

Dawei Wen,Haoyuan Weng,Bin Xiao,Pan Wang,Ruijing Fu,Zhiwei Ma,Qingguang Zeng,Guanjun Xiao

Luminescence pressure sensors, valued for their remote sensing capability and high resolution, have been developed recently. However, most current sensors rely on a linear relationship between an optical property and pressure. We propose a nonlinear machine learning (ML) method to model the luminescence intensity ratio (LIR) as a function of pressure. The versatility and performance of this method are demonstrated using (Y,Gd)(Al,Ga) 3 (BO 3 ) 4 :Cr 3+ phosphors as luminescent pressure sensors. The relative sensitivities of the 2 E → 4 A 2 / 4 T 2 → 4 A 2 LIRs in (Y,Gd)(Al,Ga) 3 (BO 3 ) 4 :Cr 3+ range from 1.58%/GPa to 25.27%/GPa. The ML fitting demonstrates a superior performance compared to linear fitting, with lower mean absolute errors (0.0355–0.1499 GPa vs. 0.1209–0.6955 GPa) and higher R 2 values (99.70–99.98% vs. 93.69–99.79%). The ML fitting method is more suitable for modeling the nonlinear relationships between LIR and pressure than traditional linear fitting. The nonlinear ML fitting approach offers a powerful new way to model the relationships between luminescence features and various physical parameters.