Surfaces and Interfaces
·
2024
·
IF 5.7
Ningning Zhou,Huihui Zheng,Mengen Hu,Rui Liu,Guangchao Qin,Yilin Lu,Haibin Tang,Zhulin Huang
In this study, highly uniform 3D Al nanoneedle arrays (AlNNAs) decorated with Ag nanopines are synthesized by anodization of Al foil with prior nanoimprinting and subsequent electrodeposition method, demonstrating remarkable surface-enhanced Raman scattering (SERS) property. The AlNNAs possess a highly ordered periodicity of 1 μm and nanoneedle height of 800 nm, making it an optimal supporting matrix to host Ag-NPs as SERS substrate. Such well-ordered Ag@AlNNAs SERS substrate with precisely electrodeposited Ag nanopines generate high density SERS host spots and abundant sites to adsorb target molecules. As a result, Ag@AlNNAs exhibit high sensitivity for rhodamine 6 G down to 10 –13 M and good signal reproducibility with a relative standard deviation of 7.2 %, as well as an average enhancement factor of 4.23 × 10 9 . For practical detection of pollutants, 10 –8 M adenine , 10 –12 M bisphenol in water, and melamine (10 –7 M) in opaque milk are clearly identified by using the Ag@AlNNAs sensor. This study opens a bright way to fabricate SERS substrate with a good balance of sensitivity, reproducibility and cost, indicating promising potential for environmental monitoring and food safety.
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Molecular Catalysis
·
2024
·
IF 3.9
Lina Sun,Ping Ning,Jie Yang,Xin Song,Kai Li
This study used metal oxide-modified metal-organic frameworks to examine H 2 S catalytic oxidation selectivity. The findings revealed that the oxidation mechanisms and products differed between Fe 2 O 3 /UiO-66 and Al 2 O 3 /UiO-66. The dithionates were intermediate products of H 2 S oxidation on Al 2 O 3 /UiO-66, whereas the bisulfates were intermediate products on Fe 2 O 3 /UiO-66. Fe 2 O 3 /UiO-66 showed stronger surface oxidation activity than Al 2 O 3 /UiO-66. The formation of sulfate/SO 2 was primarily attributable to surface oxygen, whereas elemental sulfur was primarily related to lattice oxygen. The product generation processes of H 2 S on Fe 2 O 3 /UiO-66 and Al 2 O 3 /UiO-66 surfaces were as follows: H 2 S → HSO 4 2− → SO 2 → S for Fe 2 O 3 /UiO-66, while H 2 S → S 2 O 4 2− → SO 2 for Al 2 O 3 /UiO-66. H 2 O and surface oxygen have the potential to alter H 2 S adsorption on the catalyst surface. For Fe 2 O 3 , the conversion of H 2 S to SO 2 involves both an oxidation process and a reduction process. For Al 2 O 3 , the conversion of H 2 S to SO 2 includes two oxidation processes. Due to the oxidation step of S 2 O 4 2− limiting the generation of SO 2 , the reduction process of SO 2 was also hindered, which in turn restricted the production of S over Al 2 O 3 . Fe 2 O 3 can achieve the oxidation and removal of H 2 S at lower reaction temperatures, while also creating elemental S.
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PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2024
·Vol. 49
·期 5
·e202300285
·
IF 1.7
Mi Li,Zhongxuan Han,Lin Jiang,Guozhong Xu
Nano-thermite has become a subject of significant interest in the composite energetic materials field due to its high energy release rate. To cater to diverse engineering needs, thermite formulations are often customized to fulfill specific criteria. This study investigates the potential of metal nickel (Ni) as an additive to modify nano-thermite formulations, selected for its optimal calorific values and chemical reactivity. The base materials, nano-aluminum (Al) and iron oxide (Fe 2 O 3 ), are blended with varying mass ratios of Ni (1 %, 3 %, 5 %, 7 %, 9 %) using the wet ball milling method. Pre-reaction and post-reaction morphological and compositional alterations in the resultant thermite samples are scrutinized through SEM and XRD characterization tests. Moreover, DSC analysis and combustion experiments were conducted to examine the pyrolysis and combustion behaviors of the evaluated samples. The results reveal a reduced exothermic peak on the DSC curves with the introduction of Ni, making the liquid-solid ( L - S ) phase reaction more challenging compared to the Al/Fe 2 O 3 thermite. Intriguingly, Ni addition progressively decreases the combustion temperature of thermites as the Ni's mass ratio increases, with a peak efficiency at 7 % in the perforation tests on stainless-steel plates. This research further reveals that the thermite reaction mechanism is a combined consequence of the “pre-ignition-fusion” and “fusion-diffusion” mechanisms. These insights can provide valuable guidance for designing thermite formulations for potential applications in storage, management, and pyrotechnic cutting areas.
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Materials
·
2025
·Vol. 18
·期 15
·3633
·
IF 3.2
Hengfen Shen,Hao Du,Peng Li,Mei Wang
As an efficient clean energy technology, water electrolysis for hydrogen production has its efficiency limited by the sluggish oxygen evolution reaction (OER) kinetics, which drives the demand for the development of high-performance anode OER catalysts. This work constructs bimetallic (Al, Mn) co-doped nanoporous spinel CoFe 2 O 4 (np-CFO) with a tunable structure and composition as an OER catalyst through a simple two-step dealloying strategy. The as-formed np-CFO (Al and Mn) features a hierarchical flaky configuration; that is, there are a large number of fine nanosheets attached to the surface of a regular micron-sized flake, which not only increases the number of active sites but also enhances mass transport efficiency. Consequently, the optimized catalyst exhibits a low OER overpotential of only 320 mV at a current density of 10 mA cm −2 , a minimal Tafel slope of 45.09 mV dec −1 , and exceptional durability. Even under industrial conditions (6 M KOH, 60 °C), it only needs 1.83 V to achieve a current density of 500 mA cm −2 and can maintain good stability for approximately 100 h at this high current density. Theoretical simulations indicate that Al and Mn co-doping could indeed optimize the electronic structure of CFO and thus decrease the energy barrier of OER to 1.35 eV. This work offers a practical approach towards synthesizing efficient and stable OER catalysts.
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PubMed
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2025
·
IF 7.7
Jie Yao,Hao Liu,Wei Liu,Jianxin Nie,Shi Yan,Xueyong Guo
Metal fuels are widely used in energetic materials to improve their energy release. Al Si alloy fuel is an aluminum-based alloy fuel, and its slow reaction rate limits its potential application in energy material systems. Herein, Al-Si-Mg AlSi9Mgx alloy fuel had been designed and successfully prepared by gas atomization to achieve excellent reactivity characteristics. The reaction characteristics of the fuel were systematically measured by thermal analysis (TG-DSC), bomb calorimeter, volumetric explosion vessel system and laser ignition measurement. Due to the addition of highly active magnesium, the activation energy of alloy fuel was reduced, and the combustion efficiency was increased to more than 99 %, and the ignition delay time was reduced by 6.7 ms and 33.6 ms respectively. Combustion of potassium perchlorate (KP) mixtures shows that AlSi9Mgx alloy fuels had a faster flame propagation rate, 22.814 mm/s and 42.543 mm/s. The superior reaction properties of AlSi9Mgx alloy fuel are due to the presence of internal solid solution Mg or low melting point alloy compound. This work and design provide a reliable method for optimizing the energy output of alloy fuels.
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POLYMER COMPOSITES
·
2025
·
IF 4.7
Jingsheng Yu,Bo Zhang,Wei Jin,Wei Ji,Renxin Xu
This study demonstrates effective resistance welding between 7075 aluminum (Al) alloy and carbon fiber/polyether ether ketone (CF/PEEK) composites by combining chemical etching and silanization surface treatments with a polyetherimide (PEI) thermoplastic layer. The effects of this hybrid treatment on the bonding at the 7075 Al alloy/PEI thermoplastic layer interface and the mechanical performance of the welded joints are systematically investigated. Chemical etching created a micro-nano rough surface that enhanced mechanical interlocking and increased hydroxyl group content from 12.7 mol% to 28.5 mol%. Subsequent silanization grafted amino ( NH 2 ) groups onto the 7075 Al alloy surface, enabling hydrogen bonding with the PEI thermoplastic layer. Under the synergistic effects of mechanical interlocking and hydrogen bonding, interfacial bonding is significantly enhanced, increasing the lap shear strength (LSS) of the joint from 0.2 to 24.6 MPa. The fracture failure mode of the welded joint changes from the interfacial failure of the 7075 Al alloy and PEI thermoplastic layer to the interlaminar failure of carbon fiber tearing in the heating element. Summary A new approach enables effective resistance welding of 7075 Al alloy and CF/PEEK composites. A hybrid surface treatment enhances 7075 Al alloy bonding with PEI thermoplastic layer. The hybrid surface treatment induces mechanical interlocking and hydrogen bonding effects. The synergistic effects can significantly enhance the performance of welded joints.
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CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Ze-Min Zhao,Yu Zhang,Yu Chen,Jieying Jing,Wen-Ying Li
Nickel–aluminum (Ni–Al) spinel catalysts with distinct Ni/Al molar ratios were synthesized to construct Ni 2+ coordination sites. Owing to the favorable distribution of Ni 2+ coordination sites and the presence of suitable concentration of Ni 2+ in octahedral sites, Ni/Al-0.725 catalyst achieved an 86.1 % average yield of perhydrophenanthrene, which was higher than that obtained with Ni/Al-0.25 (6.3 %). Characterization results indicated that Ni 2+ of the Ni/Al-0.725 catalyst was present in octahedral sites and ∼ 40.4 % Ni 2+ was reduced to Ni, whereas the active Ni metal of Ni/Al-0.25 catalyst mainly comprised Ni 2+ occupying tetrahedral sites as precursors. Furthermore, the Ni/Al-0.725 catalyst exhibited the smallest Ni particle size (2.82 nm) and the largest Ni available surface (19.62 m 2 /g sample ), which helped alleviate competitive adsorption among aromatic hydrocarbons. The Ni reduced by the spinel catalysts was in an electron-deficient state, which enhanced the adsorption of polycyclic aromatic hydrocarbons.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Mengran Li,Jialing Gu,Qinke Tang,Jiabao Bai,Bin Cui,Ruoyu Ma,Yunfeng Zhu,Rui Shi,Yao Zhang,Jiguang Zhang,Yana Liu,Jun Wang,Zhixin Ba,Xiaohui Hu
Magnesium hydride (MgH 2 ) is a highly promising solid-state hydrogen storage material, but its application is hindered by sluggish kinetics and high operating temperatures. Currently, alloying and catalysis are effective strategies for improving the hydrogen storage performance of MgH 2 , but the designing of a hydrogen ab/desorption system which synergistically combines them remains a challenge. Herein, Mg Al solid solution and intermetallic compounds (Al species), and a spherical Nb-doped TiO 2 (Nb-TiO 2 ) were introduced into Mg/MgH 2 to enhance the hydrogen storage performance. Al species significantly enhanced the dehydrogenation thermodynamics of Mg 90 Al 10 - 15 at.% Nb-TiO 2 , while improving the hydrogen ab/desorption kinetics of the composite synergistically with the Nb-TiO 2 . Density functional theory (DFT) calculations revealed that the synergism of Al species and Nb-TiO 2 led to preferential adsorption of H atoms at the interfaces of Nb-TiO 2 and Mg 17 Al 12 , with abundant electron transfer. The dehydrogenation enthalpy ( ΔH ) of Mg 90 Al 10 - 15 at.% Nb-TiO 2 decreased from 80.86 (MgH 2 ) to 69.05 kJ/mol, while its hydrogen desorption apparent activation energy ( E a ) decreased from 146.40 (MgH 2 ) to 88.80 kJ/mol simultaneously. The composite could absorb 4.70 wt% H 2 within 2000 s at 200 °C and showed a dehydrogenation onset temperature of 209 °C. This work reveals a synergistic effect between alloying and catalysis, advancing both the performance enhancement strategies and the mechanistic understanding of Mg-based hydrogen storage materials.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2025
·
IF 6.3
Shuhui Chen,Jinjie Mo,Ziye Ling,Zhengguo Zhang,Xiaoming Fang
The propensity for leaks in high-temperature molten alloys greatly restricts their extensive use in storing high-temperature thermal energy. In tackling this matter, the research concentrates on Al-Si/AlN composite phase change materials (PCMs), incorporating the modifier Sb to significantly improve their heat conduction and thermal steadiness. The results reveal that incorporating Sb alters the Si phase from a bulk form to an elongated one, simultaneously triggering the creation of an Al-Si@Al 2 O 3 core-shell configuration. This structural optimization reduces free electron scattering and extends the mean free path of electrons, thereby improving the thermal conductivity of the material. It was established that the ideal fraction of Sb mass is 0.6 %, where the thermal conductivity of the Sb-altered Al-Si/AlN composite PCMs attains 49.5 W/(m·K), marking a 15.2 % enhancement over the original Al-Si/AlN composite PCMs, with a latent heat of 351.5 kJ/kg. Additionally, the creation of the Al 2 O 3 shell led to the altered materials showing remarkable thermal stability across 200 high-temperature thermal cycles, resulting in less than a 4 % decrease in latent heat post-cycle and no leakage detected. The study offers not just an innovative approach for creating advanced Al-Si/AlN composite PCMs but also broadens their use in storing thermal energy at high temperatures.
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 3.2
Liu Xilin,Yang Fuwei,Yao Zhiqian,Wang Xuan,Liu Pengfei,Li Jiayin,Zhou Hu
Immobilizing the activator on the carrier is an effective strategy to solve the difficult recovery and secondary pollution of activator in advanced oxidation process. In this study, cobalt–aluminum-layered double hydroxide (activator) was immobilized on a PU membrane carrier (Co–Al-LDH@PU membrane) by a hydrothermal in situ growth technique to form a recyclable peroxymonosulfate (PMS) activator. The as-prepared Co–Al-LDH@PU membrane exhibited an excellent ability to activate PMS for the removal of tetracycline hydrochloride (TC). 97.20% of TC (30 mg L −1 ) was eliminated with Co–Al-LDH@PU membrane (3 × 3 cm 2 ) and 1.6 mM PMS at pH 5.5 in 30 min. Singlet oxygen ( 1 O 2 ) was verified as dominant reactive oxygen species responsible for TC removal via quenching tests. Mechanism investigation suggested that the redox cycle of Co 2+ /Co 3+ on the surface of Co–Al-LDH@PU membrane was crucial for PMS activation. Meanwhile, Co–Al-LDH@PU membrane displayed the ideal reusability and versatility.
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JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Jian Fan,Chunyan Cao,Lan Shang,Liangjie Yuan
High-nickel layered oxide LiNi 0.9 Co 0.1 O 2 is a promising cathode material for lithium-ion batteries due to its high specific capacity and low cost. However, the internal stress generated during deep delithiation can cause microcracks, giving rise to rapid capacity decay and deteriorated thermal stability. In this work, Mg and Al ions are incorporated into the bulk phase of LiNi 0.9 Co 0.1 O 2 via high-temperature solid-state reaction. We demonstrate that Al 3+ doping enhances charge transfer between transition metal (TM) and oxygen layers, strengthening TM-O bonds and stabilizing the structure, thereby alleviating structural distortions under deep delithiation. More impressively, Mg 2+ doping significantly improves structural stability through a pillaring effect, effectively suppressing irreversible phase transitions during charge-discharge cycling. Consequently, Mg-Al co-doping optimizes the overall structural integrity of the high-nickel cathode, enhances its stability, and inhibits lattice oxygen release during long-term cycling. The Mg-Al co-doped LiNi 0.9 Co 0.1 O 2 delivers a remarkable capacity of 177.3 mAh g −1 after 100 cycles with capacity retention of 93.5 %, demonstrating outstanding cyclability. This Mg-Al co-doping strategy provides a simple and practical approach to enhance the electrochemical performance of high-nickel layered cathode materials.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2025
·
IF 4.7
Xingyang Li,Dandan Zhang,Quanwei Zheng,Jiakui Chang,Xuan Liu,Renchun Yang,Meng Pan
In industry, it is highly desired to prepare Al-rich hierarchical zeolites by conventional alkali treatment without the use of costly chemical and special process. Here we provide an alternative strategy in which crystal defects are employed as mesopore directing agents. The effective elimination of the intracrystalline defects induces the generation of mesoporous structure in the alkali treatment process. Thus, the limitation originating from the framework Si/Al ratio of parent zeolite is circumvented. This strategy holds all merits of the conventional alkali treatment approach, which is industrially unfavorable. As an example, the Al-rich hierarchical ZSM-5 zeolites with very low Si/Al ratios were successfully prepared. The obtained Al-rich hierarchical zeolites were characterized by XRD, XRF, SEM, TEM, N 2 adsorption-desorption, in-situ IR, MAS NMR and NH 3 -TPD. The results showed that Si/Al ratios of the prepared hierarchical ZSM-5 zeolites were around 10 and the increases of external surface area and mesoporous volume were up to 2.6 and 3.7 times respectively in comparison with parent zeolite. Moreover, the constructed mesopores were interconnected open channels. In the catalytic cracking of 1,3,5-triisopropylbenzene, the Al-rich hierarchical ZSM-5 zeolites exhibited an excellent performance because of the improved diffusion of reactant and product.
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