查找使用阿拉丁产品的科研文献

N-Doped Li2ZrCl6-Based Chloride Solid Electrolytes for Enhanced Li Ion Transport

Jin Liang,Xiaojin Liu,Weiye Ma,Zhiyi Pan,Zhiqiang Liu,Yuxin Liang,Wence Xu,Shengli Zhu,Zhonghui Gao

N-doped Li2ZrCl6−3xNxchloride solid electrolytes were synthesized via a mechanochemical method, and the effects of N incorporation on crystal structure, Li local environment, and Li+transport were systematically investigated. X-ray diffraction suggested that the main Li2ZrCl6-related diffraction features were largely retained, while N introduction induced partial structural evolution towardC2/m-related features. 7Li MAS NMR revealed that N incorporation sharpened Li resonance peaks. Among the series, Li2ZrCl5.7N0.1exhibited the highest room-temperature ionic conductivity of 1.15 mS cm−1, with the lowest activation energy of 0.237 eV, demonstrating a reduced Li+migration barrier. All-solid-state batteries incorporating Li2ZrCl5.7N0.1showed stable rate capability and long-term cycling, retaining 85.9% capacity after 500 cycles at 1C and 77.4% after 3000 cycles at 3C. These results suggest that appropriate N modification can tune the Li2ZrCl6-based structure and Li local environment, thereby improving Li+transport in all-solid-state lithium batteries. This work provides a feasible strategy for improving chloride-based solid electrolytes for next-generation energy storage.

Oxygen defect engineering modifies NiFe2O4 for efficient detection of n-butanol gas

Liu Zhikuan,Diao Quan,Shang Xiaonan,Zhu Genxing,Cao Shuai,Shi Guangyuan,Jiao Mingli

Prussian blue analogs (PBA) were etched with a weak base and subsequently sulfurized to regulate the oxygen vacancy content, leading to the preparation of defect-rich spinel bimetallic oxide NiFe 2 O 4 . This approach successfully constructed a gas sensor with high response and excellent stability, and the material was systematically characterized. The results show that weak base etching regulates the morphology of PBA, and sulfur doping is employed to control the oxygen vacancy content. Gas sensing results confirmed that the modified NiFe 2 O 4 -NCs@S exhibited superior n-butanol gas sensing performance. Specifically, the sensing response of NiFe 2 O 4 -NCs@S to 100 ppm n-butanol at 275 °C reached 59.29, representing a 9.9-fold enhancement compared with NiFe 2 O 4 -PBA (response = 5.98). In addition, comprehensive tests demonstrate that the sensor possesses reliable selectivity, long-term stability and repeatability. To investigate the sensing mechanism, UV–vis spectroscopy and electrochemical characterizations were performed to verify that oxygen vacancies boost gas-sensing properties via band gap narrowing and electronic structure modulation. This work offers a novel strategy for developing high-response n-butanol gas sensors. Graphical

Balancing micro-/mesoporosity in Pt/KL zeolite catalysts for n-heptane aromatization

Dan Xu,Zhuoya Bao,Chengyao Tian,Yong Su,Angang Song,Hui Fu,Hengyi Fang,Rongkai Kang,Jianmei Wang,Arthur Ernest Koschany,Mingxing Tang,Mingdong Yi,Shuyuan Wang

1,2,6-Hexanetriol tailors KL zeolites with varied micro-/mesopore ratios. • ALD introduces Pt species into both microporous and mesoporous KL regions • A balanced micro-/mesopore architecture promotes toluene production. • An optimized pore architecture suppresses the formation of isomers. The pore architecture of KL zeolite plays a critical role in linear alkane aromatization over Pt-based catalysts. However, how the interplay between microporous confinement and mesopore-enabled diffusion regulates Pt species and the subsequent formation of aromatics remains insufficiently understood. Herein, 1,2,6-hexanetriol was selected as a zeolite growth modifier to tailor the porous structure of KL zeolite with varied micro-/mesopore ratios. Pt species were then introduced into the KL zeolites by atomic layer deposition, affording a series of Pt/KL catalysts in which Pt species were distributed in both microporous and mesoporous regions. The Pt/KL-T 1 catalyst with a mesopore-to-micropore volume ratio of 1.2 gave an enhanced toluene formation rate (7.6 × 10 2 mmol Toluene ·g Pt –1 ·h –1 ), which was approximately twice that of the purely microporous Pt/KL catalyst. Combined structural characterizations and molecular dynamics simulations indicated an appropriate balance between micropore and mesopore facilitates the diffusion and further dehydrocyclization of alkene (σC 7 = ) intermediates, while suppressing isomer formation. These findings clarify the balance of micro- and mesoporosity in KL zeolite and provide a strategy to tune Pt/KL-based catalysts for alkane aromatization. Download: Download high-res image (190KB) Download: Download full-size image

N-Acetylcysteine Attacks Phenoloxidase to Inhibit Insect Melanization and Boost Fungal Virulence

The prophenoloxidase (PPO) melanization cascade is a cornerstone of insect humoral immunity against fungal pathogens, yet its direct fungicidal mechanism remains undefined, and strategies to safely manipulate this pathway for biological control are lacking. Here, we demonstrate that infection ofDrosophilaby the entomopathogenic fungusBeauveria bassianaelicits a surge in phenoloxidase (PO) activity directly triggered by the fungal cell wall component β-1,3-Glucan. This activated PO generates reactive oxygen species (ROS) that are essential for restricting fungal proliferation, thereby establishing a mechanistic link between cascade activation and fungicidal outcome. Critically, we uncover that N-acetylcysteine (NAC), a safe, low-cost pharmaceutical in global clinical use, acts as a potent direct inhibitor of PO enzymatic activity, neutralizing the melanization-driven ROS burst. NAC-mediated inhibition significantly acceleratesB. bassianavirulence and host mortalityin vivo. Our work defines a new molecular function for NAC as a melanization inhibitor and reveals a safe, translatable strategy to suppress host immune defenses, offering a promising approach to enhance the efficacy of fungal biopesticides for sustainable pest control worldwide.

Ag-decorated ZnO/SnO2 nanofibers-based gas sensor for n-butanol sensing

Yan Chen,Qingsong Luo,Shuang Gao,Runduo Teng,Qiyuan Fu,Yanting Wang,Changhao Feng

The highly sensitive and rapid detection of n-butanol holds great significance for environmental protection and human health. In this study, Ag-decorated ZnO/SnO 2 (AZSO) nanofibers were fabricated via electrospinning followed by an Ag decoration process. Compared with the undecorated ZnO/SnO 2 nanofibers (ZSO), the as-prepared AZSO sensor exhibited enhanced gas-sensing performance, as its response to 30 ppm n-butanol increased from 29.68 to 37.15. Meanwhile, at the optimal operating temperature of 150 °C, it demonstrates an ultra-fast response time of only 1 s, and its recovery time is drastically shortened from 1776 s to 227 s. In addition, AZSO exhibited stronger selectivity towards n-butanol, accompanied by excellent repeatability and long-term stability. The enhanced gas-sensing performance of AZSO was attributed to the synergistic effect of the Ag spillover effect, the ZnO/SnO 2 n-n heterojunction, and the interfacial electron transfer.

Self-Assembly and Nonlinear Optical Properties of N-Substituted Fulleropyrrolidine Bearing Adamantane

Yuhao Liu,Hongguang Li,Shuaishuai Liu,Hongzhen Li,Yiran Zhang,Kaipeng Zhuang,Jinrui Li,Nicolas Godbert

Bearing a highly symmetric and rigid structure, fullerene C60 is a fascinating building block in supramolecular chemistry. The fact that the C60 moiety can be chemically modified brings infinite possibility in fine tuning the self-assembled structures. Herein, we report the synthesis of an N-substituted fulleropyrrolidine bearing adamantane (Ad) where the Ad unit was anchored onto the C60 moiety through only one-step reaction. Self-assembly of the Ad-C60 hybrid was investigated via a modified liquid-liquid interfacial precipitation (LLIP) method. Superstructures with rich morphologies were obtained, including spheres, hexagons, cubes, flowers and stacked flakes. Self-assemblies from xylene systems were selected as examples for deeper investigation. The internal organization was probed by power X-ray diffraction, which confirms the formation of monoclinic and orthorhombic lattice. Measurements on nonlinear optical performance revealed reverse saturable absorption. The photoluminescence of the Ad-C60 hybrid, both in solution and in the crystalline form, was also discussed with close comparison to two of its monosubstituted counterparts. This work provides insight on the structureproperty relationship of the C60-based superstructures, and strengthens the charming feature of C60 in both supramolecular chemistry and material science.

Continuously graded-doped SnO2 for efficient n–i–p perovskite solar cells

Wang Di,Li Saisai,Ding Zijin,Xu Jian,Chen Xingyu,Zheng Qiao,Alshahrani Thamraa,Liu Siyu,He Tingwei,Yue Xinxin,Qaid Saif M. H.,Wei Keyu,Fu Xuewen,Feng Lin,Yang Ou,Ju Huanxin,Jiang Yuanzhi,Chen Jun,Yuan Mingjian

Conventional n–i–p architecture remains a robust platform for scalable perovskite photovoltaics 1 , 2 , yet its steady-state efficiency has stagnated at about 26% (ref.  3 ), lagging behind their p–i–n counterparts 4 . This performance gap arises from persistent non-radiative recombination at textured electron transport layer (ETL)/perovskite interfaces, yet the underlying physical origin remains unknown. Here we show that these losses originate from the synergistic combination of band misalignment and electron accumulation at the buried interface. To address this dual challenge, we develop a continuously graded n + /n-doped SnO 2 ETL through a ligand-competitive binding strategy, which enables spatially defined doping that creates a built-in electric field. This graded architecture simultaneously minimizes band offset and accelerates electron extraction, thereby effectively suppressing the cross-interface recombination. The resulting n–i–p perovskite solar cells (PSCs) achieve a certified steady-state power conversion efficiency (PCE) of 27.17% (27.50% in reverse scan), the highest for n–i–p PSCs reported so far. The scalability of this strategy is further demonstrated by achieving a PCE of 25.79% for a 1 cm 2 device and 23.33% for a perovskite module with a 16.02 cm 2 aperture area. This work establishes a generalized example for energy-band engineering in metal-oxide transport layers, overcoming a fundamental efficiency bottleneck in conventional perovskite photovoltaics.

Prediction of Physicochemical Properties of Biodiesel/n-Butanol Using Backpropagation Neural Networks

Wu Qilong,Wang Shuang,Li Fashe,Ni Zihao,Zhou Li

With the growing global demand for renewable energy, biodiesel has garnered widespread attention due to its advantages such as renewability. However, owing to its high viscosity and poor low-temperature performance, n-butanol is introduced to improve its kinematic viscosity and low-temperature properties. This study determined the kinematic viscosity, density, freezing point, cold filter plugging point, and calorific value of Jatropha curcas biodiesel/n-butanol blended fuel, and employed GA-BP, PSO-BP, and BP models for prediction. Results indicate that at the ratios set in this experiment, increasing n-butanol content reduces the kinematic viscosity and density of the blended fuel. When the n-butanol ratio reaches 60%, the maximum decreases in freezing point, cold filter plugging point, and calorific value reach 18%, 21%, and 10%, respectively. The GA-BP model achieved training set determination coefficients close to 1 for all indicators in the prediction task, with the lowest correlation coefficient reaching 95.26%. Its prediction accuracy outperformed both the PSO-BP and BP models. After reformulating the blended fuel, the GA-BP model yielded predicted values with a minimum relative error of 0.11% compared to experimental measurements, while the maximum relative error remained below 9.94%. Overall, the GA-BP model demonstrated higher predictive accuracy for both linear and nonlinear data, providing reliable data support for blended fuel design and application.

Low-Temperature Oxidative Dehydrogenation of n-Butene over Oleate-Mediated ZnFe2O4 Catalysts

Benqun Yang,Rui Yang,Lisha Dong,Haimei Xu,Shiming Qiu,Huimin Yang,Zhifeng Li,Guofang Zuo

Traditional oxidative dehydrogenation of n-butene has typically required relatively high operating temperatures (400–500 °C), which has driven increasing interest in the development of catalysts capable of delivering high activity at lower temperatures. In this study, zinc ferrite (ZnFe2O4-ST) was successfully synthesized via hydrothermal hydrolysis of Zn–Fe oleate and demonstrated remarkable catalytic performance for the oxidative dehydrogenation of n-butene under mild conditions. At 300 °C, ZnFe2O4-ST achieved a conversion of 72.9% with 92.1% selectivity toward 1,3-butadiene, a result that, to the best of our knowledge, ranks among the best reported in the literature. By contrast, ZnFe2O4prepared by conventional coprecipitation (17.2% conversion with 91.3% selectivity) and sol-gel (10.1% conversion with 86.4% selectivity) methods showed much lower activities, highlighting the critical influence of synthesis strategy on catalytic performance. To better understand the origin of these differences, a detailed structural and physicochemical characterization was undertaken using X-ray diffraction (XRD), thermogravimetric analysis (TGA), transmission electron microscopy (TEM), N2adsorption–desorption, X-ray photoelectron spectroscopy (XPS), H2-temperature-programmed reduction (H2-TPR), temperature-programmed re-oxidation (TPRO), and NH3-temperature-programmed desorption (NH3-TPD). These analyses revealed that the as-synthesized ZnFe2O4-ST possessed a significantly smaller average particle size, a larger specific surface area, and superior reducibility compared with the other samples. These properties are believed to be the key factors underpinning its outstanding catalytic behavior and provide important insights into the design of efficient low-temperature catalysts for selective oxidative dehydrogenation.

N-Containing Compound-Assisted Morphological Engineering of Anisotropic Growth of MFI Crystals

Kaiwei Wang,Fumin Wang,Xubin Zhang,Yi Zhai,Mingshuai Sun,Yan Chen,Jiaxing Zhang,Yihao Wang,Hongyu Wang,Yang Qin,Hao Ruan,Xuyang Zou

The nanosheet MFI zeolite synthesized with a short b-axis length exhibits broad potential for industrial applications due to its ability to facilitate mass transfer through the large straight-through channel along the b-axis. The current focus of research lies in the regulation of the zeolite crystal anisotropic growth rate through the addition of specific additives to the precursor liquid. The range of available additives, however, is limited, and their effects as well as potential mechanisms are still poorly understood. The impact of incorporating ten mononitrogen compounds into the gel on crystal growth was investigated. The influence of the N-containing compounds (functional group, C/N ratio, electrostatic potential of N atoms, and compound concentration) and growth time on crystal size was analyzed. N,N-dimethylformamide (DMF) and N-methylformamide (NMF) were revealed as potential inducers of the nanosheet zeolite. Herein, the effect of DMF on the nonclassical growth of the nanosheet zeolite is unveiled within crystallization engineering. The effects of various synthetic parameters on the DMF-assisted synthesis of nanosheet zeolites were also investigated. It is revealed that DMF plays a role in accelerating crystal growth and in regulating anisotropic crystal growth. This strategy can be extended to the synthesis of different heteroatomic nanosheet zeolites (such as Al-MFI, Fe-MFI, and Ti-MFI), and it is suitable for different types of silicon and metal sources. This study presents a straightforward strategy for the systematic and precise design and synthesis of nanosheet MFI zeolites, which exhibits significant potential for industrial utilization.

Sensitive fluorescence sensor for isoliquiritigenin determination based on N-doped carbon dots

Yi Zhang,Ziyi Zhao,Hui Wu

Fluorescence nanosensor based on carbon dots (CDs) is an up-and-coming platform for precise determination of isoliquiritigenin (ISO), ensuring human health and environmental safety. Herein, biomass nitrogen-doped carbon dots (BN-CDs) were assembled through a one-pot hydrothermal platform with lemon peel and melamine as precursors, which could be developed as distinguished sensors to detect ISO. The structure and optical properties of BN-CDs were explored in detail through some analytical methods. The BN-CDs indicated excellent UV resistance performance and biocompatibility. Moreover, after the addition of ISO, the blue fluorescence could be significantly quenched, and an eminent linear relationship was acquired between ln(F 0 /F) and ISO concentrations. The fitting equation was ln(F 0 /F) = 0.054[ISO] + 0.0085 (R 2  = 0.9978) with the concentration range of 0–50 μM. 0.056 μM of detection limit was obtained based on the 3b/k. This nanosensor was successfully carried out in real samples with satisfactory recoveries of 93.3–103.9 %. This research offered a theoretical foundation towards ISO determination via blue-emitting CDs and indicated huge application potential.

Preparation and mechanical properties of gel-cast Ti(C,N)-CoCrCuFeNi cermets

Ju He,Tianrun Ma,Bohua Duan,Dezhi Wang,Zhuangzhi Wu,xinli Liu

Ti(C,N)-based cermets are widely used in cutting tools and high-temperature structural components, but their application is limited by difficulties in fabricating large and complex-shaped parts. In this study, Ti(C,N)-based cermets were prepared via gel-cast using a CoCrCuFeNi high-entropy alloy (HEA) as the binder. The effects of solid loading on slurry stability and green body formation, as well as the influence of sintering temperature on microstructure and mechanical properties, were investigated. The results show that stable slurry and uniform green bodies were obtained at a solid loading of 55 vol%. With increasing sintering temperature, densification and mechanical properties improved concurrently, while the fracture mechanism transitioned from intergranular fracture to matrix tearing. The Ti(C,N)-based cermet sintered at 1550 °C for 60 min exhibited excellent properties, with a relative density of 96.42%, hardness of 1665.67 HV30, bending strength of 671.75 MPa, and fracture toughness of 6.44 MPa m 1/2 , comparable to conventional Ti(C,N)-Ni cermets. These results demonstrate that gel-cast with a HEA binder is a promising approach for fabricating large, complex-shaped Ti(C,N)-based cermets.