LANGMUIR
·
2024
·
IF 3.7
Yinyin Peng,Ting Pan,Chuang Chen,Yuchen Zhang,Guoyuan Yuan,Derong Liu,Xiaoqin Pu,Wei Xiong
In this study, researchers developed a novel composite material called NH2-MIL-53-Al/PAN, which consists of metal–organic frameworks (MOFs) grown on electrospun PAN nanofibers (NFs). The successful formation of the composite was confirmed by X-ray diffraction (XRD) and Fourier transform infrared (FTIR), and the hydrophilicity of NH2-MIL-53-Al/PAN was demonstrated by the water contact angle (WCA). Batch experiments were conducted to investigate the adsorption performance of Co(II) under different conditions. The maximum adsorption capacity reached 58.72 mg/g, and almost 95% of the adsorption was achieved within the first 6 h. The adsorption process was found to be spontaneous and endothermic and followed the pseudo-second-order kinetics and Langmuir models. Chemisorption and molecular layer adsorption are the main mechanisms of adsorption, and X-ray photoelectron spectroscopy (XPS) analysis further reveals that the interaction between the adsorbent and cobalt is a coordination interaction. In this study, NH2-MIL-53-Al was grown in situ on PAN to ensure effective loading of MOFs and prevent agglomeration during the NF mixing process. This approach successfully addressed the challenge of exposing active sites within the embedded MOF crystals. Additionally, it overcame the difficulty of recycling traditional MOF adsorbents. As a result, the exceptional performance of MOF NFs offers a promising solution for the efficient removal of cobalt-containing wastewater.
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JOURNAL OF MOLECULAR STRUCTURE
·
2024
·
IF 4
Mengjiao Yu,Xiong-Fei Zhang,Siting Yang,Yunhua Bai,Zhongguo Wang,Jianfeng Yao
Developing functional catalysts with both Lewis and Brønsted acid sites is an essential task for achieving the direct conversion of glucose to 5-hydroxymethylfurfural (5-HMF), a process that is crucial for the sustainable production of renewable fuels and chemicals. In this work, a mixed-linker strategy is proposed to prepare defective MIL-53(Al)-NH 2 by introducing trifluoroacetic acid into the MIL-53(Al)-NH 2 synthesis process. The creation of defects facilitates the exposure and accessibility of Al 3+ centers, as well as changes the coordination environment within the MIL-53(Al)-NH 2 skeleton. Both the number of Lewis and Brønsted acid sites are boosted, which is beneficial for glucose activation and 5-HMF generation. Through optimizing the reaction conditions, a glucose conversion of 98.3 % with a 5-HMF yield of 59.3 % was achieved by using defective 6d-MIL-53(Al)-NH 2 in a biphasic tetrahydrofuran/H 2 O NaCl system. Moreover, the 6d-MIL-53(Al)-NH 2 catalyst showed excellent recyclability and reusability, with its catalytic efficiency maintained almost unchanged for consecutive 10 cycles. The catalytic mechanism was elucidated and the acidity of the Lewis and Brønsted acid was modulated by defect engineering to achieve exceptional performance.
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Optical Materials Express
·
2024
·Vol. 14
·期 6
·1531-1546
·
IF 2.8
Zhenghao Li,Zhenghao Li,Xin Li,Yan Sun,Yan Sun,Chongyun Shao,Wei Chen,Wei Chen,Xin Wang,Chunlei Yu,Lili Hu,Malgorzata Guzik,Georges Boulon
To develop Dy doped silica glass with a higher irradiation resistance, which can be adapted to high power violet or blue LD pumped yellow laser fibers, the designed Dy-Al-Ce codoped silica glasses, 0.05Dy2O3-1.5Al2O3-xCe2O3-(98.45-x)SiO2 (x = 0, 0.05, 0.1, 0.25, 0.5), were prepared by the sol-gel method. Their excitation spectra, emission spectra and emission decay curves associated with the yellow emission from 4F9/2 to 6H13/2 of Dy were determined before and after the X-ray irradiation of 1000 Gy. The relation between these spectra and Ce-codoping concentrations is discussed, including the sensitization from Ce to Dy, the reverse energy transfer from Dy to Ce, and especially the X-ray-induced photodarkening, which is detrimental to the 576 nm yellow emission of Dy. The centers that cause the photodarkening are analyzed by electron paramagnetic resonance and radiation induced absorption spectra. It is found that Ce can effectively suppress the Al-oxygen hole center induced by the X-ray across the entire concentration range of Ce-codoping, but a new photodarkening center is generated at higher concentrations of Ce-codoping. Finally, the optimized Ce-codoping concentration of ∼0.1 mol% is used to achieve a promising yellow laser glass of Dy-Al-Ce codoped silica with enhanced irradiation resistance, resulting in its X-ray-induced photodarkening that is only 6% - 14% of that in the Ce-undoped.
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Journal of Energy Storage
·
2025
·
IF 9.8
Mingjuan Li,Weiren Yang,Luyi Sun,Yuan Li,Xinzhi Chen
Solid-state electrolytes (SSEs), which offer enhanced safety and performance in energy storage applications, are emerging as a viable substitute for traditional liquid electrolytes. However, the current generation of polymer solid electrolytes (PSEs) is constrained by their pronounced interfacial resistance with electrodes and intrinsically low ionic conductivity. Here, we introduce a novel cathode-supported composite solid electrolyte (CSE) membrane based on Polyethylene oxide (PEO) and garnet ceramic nanofibers (Al-doped Li 7 La 3 Zr 2 O 12 , LLZAO). The ceramic nanofibers, synthesized via electrospinning and single-step sintering, are homogeneously dispersed within a PEO matrix and deposited onto the cathode via a tape-casting method. This integrated design enhances continuous Li + transport and improves the electrolyte-cathode interfacial contact, yielding substantial gains in electrochemical stability and ionic conductivity. The optimized CSE membrane, with 15 wt% ceramic nanofibers, exhibits a 5.6 V stability window and an ionic conductivity of 6.19 × 10 −4 S cm −1 at 60 °C. The resulting all-solid-state LFP//Li battery, featuring the cathode-supported CSE membrane, delivers a specific capacity of 143 mAh g −1 following 115 cycles at 0.5C, maintaining a remarkable capacity retention rate of 94.1 % and a 99 % average coulombic efficiency. This study presents a scalable approach for enhancing the performance of solid-state electrolyte membranes, signifying a critical advancement in all-solid-state lithium-ion batteries (ASSLIBs) and energy storage technologies.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xiangping Feng,Lei Zhang,Chao Li,Ming Shen,Runguo Zheng,Zhiyuan Wang,Hongyu Sun,Yanguo Liu
Cubic phase Li 7 La 3 Zr 2 O 12 (LLZO) is a promising electrolyte material for all-solid-state rechargeable lithium-ion batteries. The homogeneous densification of the garnet solid electrolyte ceramic material is crucial for enhancing its ionic conductivity performance. Herein, an Al/Ta co-doped strategy is employed to stabilize the cubic phase structure of LLZO and is combined with a two-step sintering method to enhance densification, in order to investigate its effect on microstructure, ionic conductivity, and electrochemical properties . During the formation process, amorphous Li 2 O reacts with doped Al 2 O 3 to create a Li–Al–O liquid phase at the grain boundaries. Combined with two-step sintering to ensure that the desired material transformation is achieved, resulting in a dense microstructure and better mechanical properties. The solid electrolyte Li 6.4 Al 0.1 La 3 Zr 1.7 Ta 0.3 O 12 under two-step sintering (LLZATO-2) is successfully synthesized, delivering an ionic conductivity up to 7.33 × 10 −4 S cm −1 at room temperature and an activation energy of 0.22 eV. This work also highlights the critical role of co-doping combined with two-step sintering in preparing well-performing solid-state electrolytes and all-solid-state lithium-ion batteries.
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INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Yu Gu,Zhiqiang Tao,Shujia Zhang,Xiaohui Wang,Hao Yan,Xinmei Liu,Lei Wang,Jun Xu,Hui Shi
Methane–propane coaromatization (MPCA) upgrades two abundant and inexpensive light alkanes into value-added aromatic products. While Ga-loaded MFI zeolites represent by far the most promising catalysts for MPCA reaction, they often contain a sizable portion of Ga species at the external surface of zeolites, which are remote from the Brønsted acid sites (BAS) within MFI pores and thus inefficient for MPCA. Here, we show that Ga can be introduced into MFI pores at fairly high loadings via a simple cocrystallization approach, yielding catalysts possessing well-dispersed Ga sites predominantly residing inside the pores and framework. Adjacency between Ga and BAS within the constraints of MFI channels makes these (Ga, Al)-H-MFI catalysts more active toward methane and propane activation and more selective toward aromatics compared to the Ga/MFI counterparts prepared by impregnation that inevitably leaves a large fraction of Ga at the external surface (i.e., without confinement and few adjacent BAS). Further, the effects of the Si/Al ratio on MPCA performance have been investigated for (Ga, Al)-H-MFI catalysts. Due to the multifold roles of BAS in the overall reaction sequence, an increased BAS concentration generally results in higher propane conversion and productivity of aromatics together with lower net methane conversion and severer coking.
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NEW JOURNAL OF CHEMISTRY
·
2025
·Vol. 49
·期 7
·2962-2972
·
IF 2.5
Jiahe Li,Fang Du,Changsheng Tang,Luyang Wang,Yulin Yang,Debin Xia,Jian Zhang,Bowen Tao,Ping Wang,Kaifeng Lin
Al–Li alloys are considered promising materials in solid propellants owing to their higher combustion efficiency than Al particles, which exhibit incomplete combustion. However, Al–Li alloy particles cannot be directly applied in propellant systems owing to their poor compatibility. Thus, in this work, an in situ polymerized film was formed via the pretreatment of Al–Li alloy followed by polymerization with trifluoroethyl methacrylate (TFEMA) and N,N′-methylene-bis-acrylamide (MBA). The hydrothermal stability of the coated samples was improved with a mass variation rate of 5.82% on treatment with TFEMA (30%) and MBA (10%), corresponding to 116.62% of Al–Li at 60 °C and 75% humidity for 30 days. Besides, the thermostability increased based on the 19° backward skewing of the high temperature exothermic peak. Meanwhile, there were no pores and cracks in the HTPB propellant, which proved the possibility of its practical application with the compatibility of level 1 with HTPB in solid rocket motors. In addition, the Al–Li propellant exhibited a better combustion performance of 0.53 s and 1309.33 °C than the Q3 Al propellant, with 1.34 s ignition delay time and 990.24 °C burning temperature. The combustion efficiency was also improved based on the observation of combustion phenomena and residue size. Besides, the combustion mechanism was analyzed based on the characteristics of Al–Li with the micro-explosion effect. Therefore, Al–Li alloy has the potential to be used as a new generation solid propellant.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Haiyang Wang,Shuo Wang,Xuanyan Liu,Youqi Zhu,Tinglu Song,Haiyue Yu,Hongdi Fu,Kangcheng Xu,Huaqiang Zhu,Yonghao Zhao,Siyuan Tang,Meishuai Zou
Aluminum-lithium alloy powders receive extensive concern as metal fuel in propellants for high heat value and coefficient of combustion. However, the presence of highly active metal lithium leads to the instability of alloy powder, limiting its application in propellants. Herein, the fluorination-energetic modification is developed to solve the activity problem of aluminum–lithium alloy (Al-5Li, Li 5 wt%) powders and increase their energy level. The first fluorinated layer is constructed by fluorosilane and epoxy silane coating to achieve the modifiable and functional aluminum–lithium alloy (Al-5Li@FS). Afterwards, the energetic layer is coated on Al-5Li@FS surface by glycidyl azide polymer (GAP) to obtain the fluorination-energetic composite powders (Al-5Li@FSG). The microstructural and chemical composition characterizations of Al-5Li@FSG are performed by SEM, FTIR, XPS, TEM, and TOF-SIMS. TG-DSC results show that the coated alloy powders can exhibit excellent thermal properties with remarkably enhanced exothermic enthalpy and thermal weight gain. The Al-5Li@FSG shows significantly improved combustion performances with reduced ignition delay time and repressed agglomeration phenomenon. Furthermore, hydrophobicity, water-reactivity, and compatibility with propellant components are also well modified of the Al-5Li@FSG. This work provides a guideline for preparing aluminum–lithium alloy powders with remarkable stability, excellent combustion performance, compatibility, and high energy level.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Weiduo Fei,Xinwen Ma,Xiandie Zhang,Jie Ji,Xiang Zhou
In this study, the self-assembly method is used to modify Al nanoparticles (Al NPs) with perfluorotetradecanoic acid (PFTD) to obtain Al@PFTD. Based on the C–F…F–C interaction and the hydrogen bond between –CF and –CH, the adsorbed PFTD is used to direct the precipitation of P(VDF-HFP) around modified Al NPs to obtain Al@PFTD@P(VDF-HFP) composite energetic materials. Scanning electron microscopy, X-ray diffraction and Fourier transform infrared spectroscopy are used to characterize the prepared samples, which prove a successful preparation process. The prepared Al@PFTD@P(VDF-HFP) is compared with physically mixed Al/P(VDF-HFP) counterparts by thermal analysis, electric ignition and constant-volume combustion tests. Thermal analysis results show that the reaction onset temperature of Al@PFTD@P(VDF-HFP) is 20 °C lower while its heat release is 135% higher. Electric ignition and constant-volume combustion tests show that the ignition delay, combustion time and pressurization rate are 50% shorter, 50% shorter and 40% faster, respectively. The improved energetic performance is mainly due to PFTD-directed precipitation of P(VDF-HFP) around Al NPs. Moreover, the fluorine-containing PFTD also contributes positively to energy density and reactivity through the pre-ignition reaction.
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Surfaces and Interfaces
·
2024
·
IF 5.7
Jun Zhang,Yimeng Cao,Fang Chen,Mengdie Cai,Jia-qi Bai,Jiawei Xue,Jingshuai Chen,Chang-Jie Mao,Song Sun
Cocatalysts play a pivotal role in enhancing the efficiency of photocatalytic water splitting. In this study, we introduced a novel and straightforward pre-impregnation strategy to anchor a CuNi dual cocatalyst onto the surface of Al-doped SrTiO 3 (Al-STO), coupled with photodeposition. This approach led to a remarkable 11.07-fold (77.5 µmol/h) increase in hydrogen evolution performance compared to the conventional photodeposition method for decorating with CuNi dual cocatalysts. Not only that, after the 18 h cycle experiment, the catalyst still maintains high activity and high stability similar to that of precious metals, which overcomes the defects of poor stability and short life of non-precious metals. This strategy capitalizes on the pre-adsorption of cocatalyst precursor ions on the Al-STO support via impregnation, enhancing both the adsorption energy and capacity between the precursor ions and the active sites. Detailed characterizations have revealed a strong electronic interaction within the Cu-Ni structure and improved interfacial coupling between CuNi and Al-STO. This not only significantly promotes charge separation and transfer but also provides a plethora of active sites for the photocatalytic generation of H 2 . Moreover, extensive theoretical calculations have provided deep insights into the reaction mechanism of the CuNi system and elucidated the reasons behind the varying degrees of activity enhancement across different cocatalyst architectural systems.
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Materials
·
2024
·Vol. 17
·期 6
·1258
·
IF 3.1
Min Liu,Yansen Zhang,Song Hu,Guohong Zhou,Xianpeng Qin,Shiwei Wang
Ce-doped gadolinium gallium aluminum oxide (Ce: GGAG) precursors were first prepared by the microwave-assisted homogeneous precipitation method (MAHP). Thermal gravity-differential thermal analysis (TG-DTA), X-ray diffraction (XRD), specific surface area analysis (BET) and field emission scanning electron microscopy (FE-SEM) were employed to investigate the crystal structure, phase evolution and morphologies of the Ce: GGAG precursors and powders. The influence of Ga ion concentration in the salt solution on the properties of Ce: GGAG powders was investigated. All the precursors were transformed into single-phase GGAG after being calcined at 950 °C in a furnace for 3 h. Monodispersed Ce: GGAG powders were obtained as the Ga ion concentration was lower than 0.06 mol/L. Single-phase and dense Ce: GGAG ceramics were obtained after sintering at 1600 °C in a flowing oxygen atmosphere for 10 h. Specifically, the Ce: GGAG ceramic reached its maximum density of ~6.68 g/cm3, which was close to its theoretical density of 6.70 g/cm3, and exhibited the highest optical transmittance of 65.2% at 800 nm after hot isostatic pressing sintering (HIP) as the Ga ion concentration was 0.02 mol/L. The decay time and light yield of the GGAG ceramic were 35 ns and 35,000 ± 1250 ph/MeV, respectively, suggesting that Ce: GGAG ceramics prepared using MAHP-synthesized nanopowders are promising for scintillation applications.
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Nature Communications
·
2025
·Vol. 16
·期 1
·1-12
·
IF 15.7
Tian Momang,Meng Ke-Juan,Xiong Kunyu,Hussain Iftikhar,Ma Xinwen,Zhang Kaili
Nanothermite has gained significant attention for its exceptional energy release rate and reactivity, making it a promising material for energetic applications. However, nanoparticle agglomeration significantly hinders its energy release efficiency. To overcome this challenge, we developed an innovative bottom-up strategy and a straightforward preparation method to construct a hierarchical Al/CuO/V 2 C nanocomposite. This is achieved through the ordered self-assembly of Al and CuO nanoparticles in an ethanol suspension, using V 2 C MXene as a template. Our findings show that the Al/CuO/V 2 C nanocomposite exhibits distinct morphologies based on V 2 C concentration: nanosheets at lower concentrations and microspheres at higher concentrations. CuO and Al nanoparticles form the first and second layers outside the V 2 C, respectively, due to the interplay between electrostatic forces and covalent Cu-O-V bonds. This unique structure, along with high reactivity of V 2 C, enables complete Al oxidation, achieving a heat release of 3156.2 J g -1 with a 10 wt% V 2 C addition—seven times greater than the Al/CuO control group. The concentration-dependent structure allows for tunable energetic performance, from a rapid 3-ms deflagration to a prolonged 16-ms combustion. Reduced gas release enhances safety, paving the way for applications in microinitiators and advancing nanothermite technology.
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