JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Sain Bux Jamali,Tauqeer Haidar Qamar,Sibt ul Hassan,Lei Ma,Pengkun Xia,Xuejun Zhang,M. Mateen,Shengxiang Huang,Lianwen Deng
Nitrogen-doped porous carbon nanocomposites are highly sought-after materials for electromagnetic wave absorption due to their unique combination of electrical and magnetic properties. However, achieving optimal absorption performance within the critical C-band (4–8 GHz) frequency range remains a significant challenge. Ni@NPC nanocomposites, synthesized through the polymer bubbling technique, demonstrated exceptional microwave absorption (MWA) performance in the C-band. These materials exhibited a reflection loss (RL) of −65.20 dB at a thickness of 4.8 mm. When carbonized at 600 °C, a thickness of 2.0 mm achieved an effective absorption bandwidth (EAB) of 5.74 GHz. The remarkable absorption performance is ascribed to the combined effect of their porous composition and the addition of nitrogen dopants, which efficiently foster various microwave attenuation processes. Furthermore, the material’s effectiveness in real-world applications was evaluated using computer simulation technology (CST). This work highlights the potential of the one-pot fabrication method for developing high-performance MWA materials with practical applications.
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高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Shouyu Ren,Qian Chen,Yuxin Jin,Xiaohui Liang,Cao Wu,Yu Zhang,Zengming Man,Zhou Chen
Diverse phases of Fe2O3 manifest distinct physical and chemical attributes. Herein, Fe2O3 and Fe2O3@C dodecahedrons with the yolk-shell structure were prepared by controllable pyrolysis of MIL-88 MOFs with different processes. The corresponding pyrolytic stages in air were proposed, followed closely via a similar self-oxidation/reduction procedure in the N2 atmosphere. In terms of microwave absorption performance, the hollow α-Fe2O3@C nanocomposites with the yolk-shell structure could facilitate the dielectric loss, and the interfaces between α-Fe2O3 and C promote the dissipation of an electromagnetic wave, which improve electromagnetic attenuation capability and enrich the loss mechanism of Fe2O3 collaboratively. Due to its carbon-coated hollow structure, αγ-Fe2O3@C nanocomposites calcinated at 400 °C exhibit the best ability for electromagnetic energy conversion. The device has a matching thickness of 2.25 mm, an effective absorption bandwidth of 11.2 to 15.64 GHz, and a total width of 4.44 GHz. Its highest reflection loss (RL) is −52 dB at 8.6 GHz (X band). In the range of −80 < θ < 80, the maximum radar cross section (RCS) reduction of α-Fe2O3@C is greater than 20 dB m2. A great deal of attention has been paid to theoretical simulations of RCS because of its reasonable composition and low-cost features. This work breaks ground for fabricating a MIL-88-derived electromagnetic wave absorber via the enlightenment of RCS simulations.
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Cells
·
2026
·Vol. 15
·期 20
·1900
·
IF 6
Sutong Zhan,Yong Deng,Peilin Chen,Tangfeng Lv,Yong Song,Jiaxin Liu,Chuiyu Kong
Metabolic reprogramming and the phenotypic switching of pulmonary arterial smooth muscle cells (PASMCs) are critical pathological features of pulmonary arterial hypertension (PAH). Here, we demonstrated that Tirzepatide (TZP) can significantly ameliorate echocardiographic indicators of pulmonary vascular load and attenuate distal pulmonary vascular remodeling by suppressing PASMC phenotypic switching. Metabolomics and cellular metabolic flux analyses revealed that TZP corrected the Warburg effect, thereby attenuating intracellular lactate accumulation, which we identified as a driver that promotes the synthetic phenotype in PASMCs and exacerbates PAH. Mechanistically, the protective effects of TZP were strongly associated with the activation of the AMPK/SIRT1 signaling pathway, which mediated a significant reduction in histone H4 lysine 12 lactylation (H4K12la). This epigenetic reduction suppressed the transcription of the proto-oncogeneJunand its downstream pathways, which promote PASMC phenotypic switching and PAH deterioration. Thus, we propose a working model wherein TZP attenuates PAH progression by modulating pathological metabolism and reducing c-Jun transcription via the AMPK/SIRT1/H4K12la axis. These findings provide preliminary translational implications for targeting metabolic-epigenetic crosstalk and offer a preclinical rationale for exploring TZP as a protective pharmacological strategy in PAH.
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PubMed
高影响因子
ACS Nano
·
2020
·
IF 14.588
Xinxin Zhang,Fei Wang,Lvye Dou,Xiaota Cheng,Yang Si,Jianyong Yu,Bin Ding
Advanced ceramic aerogel materials with a performance combining sufficient mechanical robustness and splendid high-temperature resistance are urgently needed as thermal insulators in harsh environments. However, the practical applications of ceramic aerogel materials are always limited by poor mechanical performance and degradation under thermal shock. Here, we report the facile creation of lamellar multiarch structured ceramic nanofibrous aerogels that are simultaneously ultrastrong, superelastic, and high temperature resistant by combining ZrO2–Al2O3 nanofibers with Al(H2PO4)3 matrices. The resulting ZrO2–Al2O3 nanofibrous aerogels exhibit the integrated properties of rapid recovery from a strain of 90%, high compression strength of more than 1100 kPa (at a strain of 90%), high fatigue resistance, and temperature-invariant superelasticity. Moreover, the all-ceramic component feature also provides the ceramic nanofibrous aerogels with high-temperature resistance up to 1300 °C and thermal insulation performance with low thermal conductivity (0.0322 W m–1 K–1). These superior performances make the ceramic aerogels ideal for high-temperature thermal insulation materials in extreme conditions.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 4
·B193
·
IF 3.12
Sheying Dong,Hao Cui,Dandan Zhang,Mengmeng Tong
Several reports reveal that high level of C-reactive protein (CRP) in serum enhances venture of diabetes. In this article, we presented a platform which blended Zr(IV)-organic framework with 2,5-thiophenedicarboxylate ligand (Zr-tdc) and ionic liquid (IL) to form a steady composite membrane on the carbon paste electrode (CPE). The platform was applied to CRP and glucose biosensors which were connected with diabetes and displayed well performances. Firstly, a sensitive immunosensor for label-free and direct detection of CRP was developed at Zr-tdc/IL modified electrode. Under optimal conditions, differential pulse voltammetry (DPV) response showed the low detection limit of CRP was 0.2 ng/mL. Secondly, the glucose biosensor immobilized glucose oxidase (GOX) was constructed and studied by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and amperometric response. The Michaelis–Menten constant (KM) of immobilized GOX was 0.16 mM, and the detection limit was 2.7 μM for glucose. Two novel biosensors displayed well selectivity, stability and lower detection limit. This work improved the performance of electrochemical sensing and expand the utilization of the material by carrying on the effective immobilization of enzyme and antibody.
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高影响因子
MACROMOLECULES
·
2023
·
IF 5.5
Jirong Wang,Chi Zhang,Yong Zhang,Gong Chen,Rinaldo Poli,Xiaolin Xie,Zhigang Xue
Assembling polymer electrolytes (PEs) with lithium metal anodes is a promising strategy to address safety and specific capacity concerns. Molecular design on conductive polymer matrices avoids inherent high crystallinity, poor ion transport, and combustion drawbacks by adjusting the chain structure and functional groups. However, conventional structural modulation methods are difficult to conduct via in situ polymerization and cell assembly, thus hampering the further performance enhancement of PEs in lithium batteries. Herein, we report a simple aza-Michael addition method induced by lithium salts for designing and fabricating high-performance PEs. This method fulfills the in situ structure modulation of polyether-based PEs without any introduction of non-electrolytic components. The obtained polyether electrolytes exhibit a more amorphous cross-linked structure, leading to a favorable medium for ion migration and excellent flexibility. In addition, the introduction of C–N bonds imparts excellent non-flammability to the material as well as the ability to interact with sulfolane. Hence, the in situ-constructed gel polymer electrolyte (GPE) is characterized by a high ionic conductivity (1.76 × 10–4 S cm–1 at 30 °C) and excellent interface stability with the electrodes. The assembled Li/LiFePO4 (LFP) battery based on this newly designed GPE exhibits a high initial specific discharge capacity and a good rate performance (112.7 mAh g–1 at 5 C). Long-term stability was also demonstrated, with a capacity retention of 86.8% after 500 cycles at 0.5 C.
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高影响因子
RUSSIAN JOURNAL OF GENERAL CHEMISTRY
·
2025
·Vol. 95
·期 6
·1455-1463
·
IF 0.8
Chen X.,Xiu X.,Zhuang X.,Sun H.,Dong C.
Developing cost-effective and efficient non-precious metal oxygen reduction catalysts (ORRs) is crucial for advancing renewable energy technologies. This study reports the synthesis and characterization of a novel non-precious metal catalyst, N–C–Fe-600, synthesized via a simple two-step method. Pyrolysis of NH 2 –MIL-88(Fe) under an inert atmosphere, followed by acidic treatment, yielded a porous N–C–Fe-600 material featuring a high surface area and a substantial concentration of active Fe–N x sites. Electrochemical characterization revealed that N–C–Fe-600 exhibits ORR activity comparable to commercial Pt/C catalysts, along with significantly enhanced stability and methanol tolerance. The catalyst demonstrates a near-ideal four-electron transfer pathway, suggesting its potential as a viable alternative to platinum-based catalysts in fuel cells.
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高影响因子
INORGANICA CHIMICA ACTA
·
2015
·
IF 2.046
Wei-Guo Jia,Dan-Dan Li,Cuiping Gu,Yuan-Chen Dai,Ying-Hua Zhou,Guozan Yuan,En-Hong Sheng
Binuclear [{(DMOX)CdCl} 2 ( μ -Cl) 2 ] (DMOX = 4,5-dihydro-2-(4,5-dihydro-4,4-dimethyloxazol-2-yl)-4,4-dimethyl-oxazole) ( 1 ) and mononuclear [(Dm-Pybox)CdCl 2 ] (Dm-Pybox = 2,6-bis[4′,4′-dimethyloxazolin-2′-yl]pyridine) ( 2 ) were obtained by reacting CdCl 2 with DMOX and Dm-Pybox ligands, respectively. In the solid state, the supramolecular structures of 1 and 2 feature helical chains fabricated by C–H⋯Cl hydrogen bond interactions. The C–N cross-coupling reactions catalyzed by the two complexes were also investigated in homogeneous system. The results show that binuclear complex 1 exhibit significantly enhanced catalytic activity for C–N cross-coupling reactions.
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高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Nali Li,Yong Yu,Yanwei Tong,Tiantian Liu,Xuefeng Zhang
An enhanced sol-gel combustion method was used to synthesize different porous Sc 3+ -doped Li 3 V 2-x Sc x (PO 4 ) 3 /C (x = 0.00, 0.05, 0.10 and 0.15) compounds. The substitution of Sc 3+ into the V 3+ sites of Li 3 V 2-x Sc x (PO 4 ) 3 /C expands the lattice volume along with the enlargement of Li + diffusion channel, which is beneficial for Li + transportation and ionic conductivity improvement. Besides, the Sc 3+ doping content exhibits a great impact on the morphology of Li 3 V 2-x Sc x (PO 4 ) 3 /C composite. The pristine Li 3 V 2 (PO 4 ) 3 /C are constituted of porous particles and nanorods , and the ratio of nanorods to particles can be controlled by adjusting the amount of Sc 3+ doping since the ratio of nanorods to particles decreases with increasing Sc 3+ doping content. When Sc 3+ doping content increases to a certain level (x = 0.15, Li 3 V 1.85 Sc 0.15 (PO 4 ) 3 /C), the nanorods are hardly seen. Li 3 V 1.90 Sc 0.10 (PO 4 ) 3 /C with higher tapped density, better reversibility, smaller resistance and larger Li + diffusion coefficient demonstrates outstanding rate performance and cyclic stability, together with high specific discharge capacities of 130.2 and 92.9 mAh g −1 at 0.5 and 20 C, respectively. Furthermore, a superior specific discharge capacity of 85.8 mAh g −1 was retained at 20 C following 1000 cycles. Overall, a novel approach for the preparation of high-performance Li 3 V 2-x Sc x (PO 4 ) 3 /C cathodes with different morphologies for lithium-ion batteries is provided.
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高影响因子
Inorganics
·
2024
·Vol. 12
·期 11
·273
·
IF 3.1
Quan Yang,Xiansong Jia,Zhikang Qin,Xiaoli Ding,Yongtao Li
Carbon-based materials with excellent catalytic activity provide new ideas for the development of magnesium-based hydrogen storage. C-H bonding interactions may play a key role in performance improvement. In this work, we comprehensively compare the magnesium-carbon cloth composites (CC) prepared by method of dry ball milling and wet impregnation. The results were that the hydrogen release activation energy (Ea) of MgH2@CC composites prepared by wet immersion method was 175.1 ± 19.5 kJ·mol−1, which was lower than that of pure MgH2(Ea= 213.9 ± 6.4 kJ·mol−1), and the activation energy of MgH2-CC composites prepared by ball milling method was 137.3 ± 8.7 kJ·mol−1, which provided better results. The kinetic enhancement should be attributed to C-H interactions. The presence of carbon carriers and electron transfer to reduce the activation energy of Mg-H bond fracture. These results will provide further insights into the promotion of hydrogen ab-/desorption from metal hydrides.
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高影响因子
eScience
·
2022
·
IF 0
Hanyin Zhang,Renzong Hu,Sirui Feng,Zhiqun Lin,Min Zhu
SiO-based materials represent a promising class of anodes for lithium-ion batteries (LIBs), with a high theoretical capacity and appropriate and safe Li-insertion potential. However, SiO experiences a large volume change during the electrochemical reaction, low Li diffusivity, and low electron conductivity, resulting in degradation and low rate capability for LIBs. Here, we report on the rapid crafting of SiO–Sn 2 Fe@C composites via a one-step plasma milling process, leading to an alloy of Sn and Fe and in turn refining SiO and Sn 2 Fe into nanoparticles that are well dispersed in a nanosized, few-layer graphene matrix. The Sn and Fe nanoparticles generated during the first Li-insertion process form a stable network to improve Li diffusivity and electron conductivity. As an anode material, the SiO–Sn 2 Fe@C composite manifests high reversible capacities, superior cycling stability, and excellent rate capability. The capacity retention is found to be as high as 95% and 84% at the 100th and 300th cycles under 0.3 C. During rate capability testing at 3, 6, and 11 C, the capacity retentions are 71%, 60%, and 50%, respectively. This study highlights that this simple, one-step plasma milling strategy can further improve SiO-based anode materials for high-performance LIBs.
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ChemistrySelect
·
2024
·Vol. 9
·期 28
·e202402061
·
IF 1.9
Jiankang Ou,Haoyu Liu,Zeguo Fang,Qian Zhang,Dong Li
Graphical Construction of C−C bonds of alkyl-substituted naphthoquinones through C−H/C−H cross dehydrogenation coupling of naphthoquinones with acetone and 1,3-dicarbonyl compounds was developed. A direct C−H alkylation of naphthoquinones with acetone and 1,3-dicarbonyl compounds was developed to construct C−C bonds of alkyl-substituted naphthoquinone derivatives. It proceeded through an oxidative radical cross dehydrogenation coupling process under simple and mild conditions. This method provides a facile and efficient route for synthesis of functionalized naphthoquinones from readily available feedstocks.
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高影响因子
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