Molecular Catalysis
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2024
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IF 3.9
XiaoNing Gao,YanXiao Zhang,Wei Fu,Hong Zhou,Lu Feng
Conventional hydrolysis of total saponins for the extraction of diosgenin, an essential ingredient in the production of steroid hormones, has caused significant ecological pollution, making efficient and clean extraction methods necessary. Here, UiO-66-NH 2 with defect sites containing Zr-coordinated hydroxide and water groups was synthesized using concentrated HCl as a crystal modulator, which was further treated with trimethylsilyl trifluoromethanesulfonate (Me 3 SiOTf) to afford UiO-66-NH 2 OTf using the oxygen affinity of the Me 3 Si group. The strong Lewis acid UiO-66-NH 2 OTf was used to extract diosgenin from the total saponin, and the extraction temperature, extraction time and amount of addition were optimized using single-factor experiments and the response surface method. In addition, high-resolution mass spectrometry has been used to analyze the resulting compounds, thus suggesting an alcoholysis pathway and an alcoholysis mechanism for the total saponins.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
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IF 8.5
Ku-Ku Hao,Qi-Jin Wang,Sheng-Xiang Wei,Hua-Yang Si,Jing-Wen Hao,Nai-Fu Chen,Nai-Dong Chen,Xiao-Yan Gao,Si-Jie Liao,Shao-Jun Zheng,Man-Man Zhang
A neutral polysaccharide (NDHP-2-1) was isolated from Dendrobium huoshanense C. Z. Tang et S. J. Cheng ( D. huoshanense ). Structure characterization revealed that the weight-average molecular weight of NDHP-2-1 was 20.42 kDa, mainly composed of glucose (95.46 %) and mannose (4.54 %). The backbone of NDHP-2-1 consisted of →6)-α-D-Glc p -(1→, →4)-α-D-Glc p -(1→, and →3,4)-α-D-Glc p -(1→. The T-α-D-Glc p was regarded as the branches attached to the O-4 position of →3,4)-α-D-Glc p -(1 → in the backbone. In vitro experiments indicated that NDHP-2-1 exhibited excellent anti-inflammatory activity. The RAW264.7 cell assay results showed that NDHP-2-1 effectively inhibited the release of pro-inflammatory cytokines, including interleukin-6 (IL-6), tumor necrosis factor-α (TNF-α), interleukin-10 (IL-10) from LPS-stimulated macrophages. In general, the newly isolated polysaccharide of NDHP-2-1 exhibited significant anti-inflammatory and immunomodulatory properties, suggesting its potential as an effective natural therapeutic agent for managing inflammatory diseases.
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Journal of Materials Chemistry C
·
2024
·
IF 5.7
Weixiao Dong,Xiaojie Sun,Tuo Zhang,Ping Chen
Although silicon is a promising anode material for lithium-ion batteries, efficient and controllable synthesis of silicon anodes with good cyclability and low electrode swelling remains a major challenge. Here, we have synthesized a novel bread-like Si/C composite with a yolk-double shell structure through sol–gel and self-template methods. In this design, the zeolite imidazolate framework-derived nitrogen-doped porous carbon skeleton is applied to enhance the electrical conductivity of silicon, and the adequate space inside the yolk-double shell structure can effectively mitigate the volume change of silicon. Additionally, porous structures are not only conducive to the rapid diffusion of the electrolyte but also shorten the migration channel of lithium ions and electrons. The stable bread-like double carbon layer structure helps in the formation of stable solid electrolyte interphase films. As expected, the composite demonstrates exceptional electrochemical properties, including outstanding reversible capacity (868.1 mA h g−1 after 500 extended cycles at 1 A g−1) and remarkable rate capability (408.1 mA h g−1 at a high current density of 5 A g−1). Moreover, the anode has a low electrode expansion rate of 31% after cycling. This study provides a new idea for designing high-stability silicon-based anode materials.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2024
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IF 5.8
Yang-Yang Xu,Xing Fan,Feng-Yun Ma,Hai-Xu Zou,Xian-Yong Wei
Directly converting lignite into arenes as commodity chemicals and drop-in fuels is a highly desirable target for researchers. However, this is severely limited by the presence of stable inter unit C-O linkages in lignite. Herein, a highly active catalyst, Co-MoS 2 , has been designed and prepared to be used for the selective catalytic cleavage of inter unit C-O bridged bonds (BBs) in the conversion of Naomaohu (NMH), a lignite, to yield arenes. Both catalytic hydrogenation conversion (CHC) and thermal dissolution (a non-catalytic process, named NCHC) of NMH were conducted using n-hexane as the solvent. The soluble fractions from the first stage of NCHC (SF NCHC-1 ) and CHC (SF CHC-1 ), as well as the second stage of NCHC (SF NCHC-2 ) and CHC (SF CHC-2 ) were obtained using the same solvent. After the first-stage catalytic treatment, the relative contents of arenes and alkanes in SF CHC-1 increased by 16.7 % and 9.3 %, respectively, compared to those in SF NCHC-1 , and the relative content of oxygen-containing compounds (OCCs), such as alcohols, phenols , esters, ketones , acids, and furans, decreased by 13.2 %. For the second-stage conversion, the relative contents of arenes and alkanes in SF CHC-2 were 53.5 % and 15.5 % higher than those in SF NCHC-2 , and the relative contents of OCCs was only 6.6 % in SF CHC-2 . The catalytic mechanisms of cleavage of C-O BBs and deoxygenation were proposed based on the CHC of model compounds and density functional theory (DFT) calculation. The adsorption of OCCs and the activation of released hydrogen radical (H·) by Co-MoS 2 , followed by H· addition to the carbon atom connected to oxygen in C-O BBs and oxygen-containing functional groups, are crucial for the cleavage of C-O BBs and formation of deoxygenated compounds, particularly arenes.
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ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Jinnuo Yang,Wenqiang Ai,Lingke Li,Shilong Dong,Jiahui Lv,Ruiqi Wang,Yang Liu,Lei Zu,Huiqin Lian
Sodium-ion batteries (SIBs) offer great viability for extensive energy storage due to their abundance, low cost, and excellent safety. In this study, we investigate the relationship between P–O–C bonds content and electrochemical performance of black phosphorus–hard carbon–carbon nanotubes (BP-HC-CNTs) composite anode. A series of composites are prepared via ball milling, in which the relative P–O–C bonds content is modulated by varying the HC to CNTs ratio, and the effect of different relative P–O–C bond contents on the electrochemical performance of the materials is systematically investigated. The findings indicate that tuning the HC to CNTs ratio alters the chemical bonding degree between phosphorus and carbon, specifically the P–O–C bond content, which positively correlates with enhanced electrochemical performance. Notably, the composite with the highest P–O–C content (36 %) exhibits superior performance compared to those with lower bond contents: The specific capacity is approximately 2.9 times higher after 600 cycles at 6.0 A g ⁻¹ , and after 2000 cycles at 15.0 A g ⁻¹ , it is about 5.7 times higher. These results demonstrate excellent rate capability and cycling stability. Therefore, we propose that adjusting the hard carbon/carbon nanotubes ratio effectively regulates P–O–C bonds formation, which is essential for improving interfacial stability and electrochemical kinetics.
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JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
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2024
·
IF 2.2
Lin Jia,Wang Shuai,Jin Hua,Wang Rongwen,Cui Shuyuan,Yang Yihang,Wang Jinhuo,Huang Guimei
Ceramic parts with complex structures can be manufactured by three-dimensional (3D) printing technology. However, the ceramic raw materials available for 3D printing are very limited. This paper mainly focuses on the selection, composition, and proportion optimization of ceramic precursor systems. The optimal photoinitiator was selected by comparing the ultraviolet absorption bands of 2,2-dimethoxy-2-phenylacetophenone), diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide, and bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide (819) photoinitiators. In addition, the effects of different photoinitiators on system reactions and curing efficiency were considered, and the content of photoinitiators was optimized based on actual conditions. The mercapto-to-vinyl ratio was optimized to obtain Si-O-C-based ceramic raw materials that could be used for photo-curing 3D printing by comparing the ceramic yield, size shrinkage, and mechanical properties.
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JOURNAL OF MATERIALS SCIENCE
·
2025
·
IF 3.9
Cai Haopeng,Chen Yangdie,Feng Chaochao,Lin Zhenqin
Aimed to address the poor impedance matching of pure tetra-needle ZnO (T-ZnO) as well as to optimise the structure of the wave-absorbing material, this research focused on constructing a bimetallic Zn/Co-ZIF-coated T-ZnO core–shell structure with T-ZnO as a self-sacrificial template. In this work, T-ZnO@Zn/Co-ZIF composites were synthesized by optimizing shell uniformity via modulating DMF/H 2 O solvent ratios (3:1 to 1:1 v/v) and reaction durations (6/24 h). By further pyrolysis, the formation of hollow structures of the derivatives was investigated and the electromagnetic wave absorption performance of the derived materials were evaluated. Optimal core–shell uniformity was achieved at DMF/H 2 O = 3:1 with 24 h reaction time (DH31-24). Pyrolysis at 800 °C (PDH31-24-800) produced hollow Co/C derivatives with complete ZnO volatilization. This material exhibited superior microwave absorption: minimum RL of − 16.40 dB at 14.00 GHz (3.00 mm thickness) and an effective bandwidth (RL ≤ − 10 dB) of 4.48 GHz (11.12–15.60 GHz).
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ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Yan Zhang,Xiaowei Chen,Wei Li,Baoyi Wang,Qian Zhang,Zhuo Zhao,Yafei Wang,Ying Guan,Yongjun Zhang
The freezing of the dispersion medium causes a huge deterioration in mechanical performance, conductivity, and optical properties of gel materials, limiting their functionality in low-temperature environments such as outer space, deep sea, and polar areas. Here, a deep eutectic solvent is developed using 2-methyl-1,3-propanediol as a hydrogen bond donor and choline chloride as a hydrogen bond acceptor, achieving remarkably low freezing temperature of −107.7 °C, while also exhibiting transparency, stability, and ionic conductive capabilities across a broad temperature range. Utilizing this solvent as a dispersion medium, microphase-separated eutectogels are prepared via the copolymerization of acrylamide and acrylic acid. Retaining its stretchability, high toughness, and energy dissipation capability at −100 °C, the gel thereby serves as an exceptional materials for impact resistance, vibration damping, and temperature sensing. Finally, the development of 2-methyl-1,3-propanediol based solvent and gel materials is expected to offer a new solution for cryo-science and antifreeze applications.
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ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Qingtao Liu,Weihao Liu,Xin Wan,Weiwei Chen,Xiaozhi Liu,Xiaofang Liu,Jiaxiang Shang,Jungang Miao,Dong Su,Xin Sun,Jianglan Shui
Zeolitic imidazolate framework-8 (ZIF-8) is widely used as precursor for carbon-supported single-metal-atom catalysts (M–N–C), but typically yields amorphous carbon with poor stability in proton-exchange-membrane fuel cells (PEMFCs). Traditional methods would lose active site density while increasing the graphitization degree. Here, this study reports that ultra-small nano ZIF-8 can produce graphene-nanostacks-based Fe–N–C that has improvements on both activity and stability. First, anti-sintering nanoporous ZIF-8 (nano-ZIF8) particles are synthesized with unit size of 8 nm (the smallest so far) using a destruction-reconstruction strategy. In situ microscopy reveals that the volatilization of Zn has a decisive effect on the graphitization degree of ZIF-8 and such process is size-dependent. Nano-ZIF8 particles have completed Zn volatilization before graphitization process beginning, leading to graphene nanostacks. These nanostacks preferentially host edge-type FeN 4 sites, which have doubled intrinsic activity and much improved stability compared with conventional Fe−N−C. In PEMFC, the catalyst achieves an activity of 48.5 mA cm − 2 @0.9V iR -free , meeting the US Department of Energy 2025 activity target. In addition, quantitative analysis of active site density is conducted in PEMFC for the first time using nitrite stripping voltammetry. The unique graphitization behavior of nano-ZIF8 paves a new avenue for advancing M–N–C catalysts.
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Advanced Composites and Hybrid Materials
·
2025
·Vol. 8
·期 6
·435
·
IF 21.8
Hong Na,Li Nian,Li Zhao,Zhang Shudong,Ali Sarmad,Song Yanping,Liu Cui,Kang Jun,Wang Shihao,Zhang Jin Zhong,Wang Zhenyang
Silicon-carbon composite anodes hold the promise to resolve the irreversible capacity fading of silicon in lithium-ion batteries but face persistent challenges dominated by unstable, physical interfacial contacts. Herein, a laser-directed covalent bonding strategy is developed to construct atomic-scale Si–N–C bridges between silicon suboxide (SiO x ) nanoparticles and a 3D nitrogen-doped graphene framework. Localized photothermal processing of polyimide-urea-SiO x precursors on carbon-coated copper foil enables in situ integration of chemically anchored SiO x within a conductive graphene network. The architecture achieves dual stabilization: (i) strong Si–N–C covalent bonds suppress interfacial cracking, while (ii) hierarchical porosity accommodates strain via elastic deformation. Critically, direct fabrication eliminates slurry-derived defects, ensuring structural integrity and minimized interfacial impedance. The optimized composite anode delivers 1826.4 mAh g -1 at 0.1 A g -1 and retains 91.3% capacity over 1000 cycles at a high current density of 2.0 A g -1 , demonstrating exceptional stability under high-rate operation. Mechanistically, density functional theory (DFT) reveals that Si–N–C bonding lowers lithium-ion (Li⁺) adsorption energy (–6.549 eV) and redistributes interfacial charge density, synergistically accelerating ion transport. This work provides atomic-scale insights into covalent interface design and establishes a scalable laser-processing strategy of composite anodes for durable high-energy-density batteries. Graphical
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APPLIED ENERGY
·
2025
·
IF 11
Xianda Sun,Baibin Ma,Jinxu Hao,Zirui Wu,Yi Li,Hao Liu,Yuandong Yang,Xiaohan Ren
The ammonia crossover that poisons the conventional cathode catalysts and damages the cell performance and efficiency is one of the paramount bottlenecks limiting the development of direct ammonia fuel cells (DAFCs). Synthetizing the ammonia tolerance catalysts has been proven to be an effective avenue to solve the above-mentioned problems, however, the mass and charge transports within the anti-ammonia poisoning electrodes has not been fully elucidated. Herein, an alkaline DAFC with anti-ammonia poisoning Fe-N-C cathode is reported, and the main effort is expended on investigating the impact of mass and charge transports on cell performance, internal resistance, and operating stability. The alkaline DAFC exhibits a thermodynamic efficiency as high as 88.6 %, higher than that of hydrogen-based fuel cells. The preliminary experimental results indicate that the performance of DAFC with anti-ammonia poisoning Fe-N-C cathode is higher than that of conventional Pt/C cathode under the same catalyst loading. The impressive open-circuit voltage of 0.74 V and peak power density of 107 mW cm −2 are obtained under atmospheric pressure and 80 °C, which is primarily ascribed to both the anti-ammonia poisoning of Fe-N-C catalyst and the facilitated mass and charge transports. Furthermore, the voltage curve of DAFC is quite stable during the constant-current discharging at 100 mA cm −2 for 10-h, demonstrating the good durability of DAFC with anti-ammonia poisoning Fe-N-C cathode.
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ANALYTICA CHIMICA ACTA
·
2025
·
IF 6
Zhongyou Jiang,Shanshan Dong,Dingying He,Jiazheng Yang,Suqing Dai,Shuaitao Peng,Suhua Chen
Bonded nitrogen of lone pair electrons gives a chance for carbon-based substrates to complex with and consequently electrochemically analyze heavy metals, e.g., cadmium(II) (Cd(II)). However, the carbon atom bonded with nitrogen atom present positively charged and could electrostatically hinder Cd(II) adsorption, leading to a limited electroanalytical sensitivity. In this study, we adopted a sequential iron occupying and nitric acid etching strategy to elongate C–N bond in graphitic carbon nitride (CN), which could weaken the energy barrier for Cd(II) adsorption. Material characterizations show the iron occupying and nitric acid etching strategy successfully elongated C–N bond without damaging the skeletal structure of CN and significantly enhanced Cd(II) adsorption capacity. Experiments combined with first principle calculations verified the efficient and sensitive binding of Cd(II) with nitrogen in the elongated C–N. As a result, in comparison with pristine CN, the C–N elongated material (marked as EtCN–Fe 0.3 ) possessed a much higher sensitivity (22.34 vs. 16.92 μA ppb −1 cm −2 ) and a dramatically lower limit of detection (LOD) (0.29 vs. 2.22 ppb). The sensor demonstrates a broad linear range (1−500 ppb), exceptional reproducibility (relative standard deviation = 1.4 %), and long-term stability (only 1.1 % of sensitivity loss over 10 days). EtCN–Fe 0.3 electrode even showed high recovery rates (98.2−102.4 %) in various real waters, which were in agreement with Inductively coupled plasma-mass spectrometry (ICP-MS)/Atomic absorption spectrophotometry (AAS) methods. This study provides a facile strategy to activate carbon materials to electrochemically detect trace heavy metals with precision and cost-effectiveness.
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危险品化学品经营许可证（带存储）