FOOD CHEMISTRY
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2026
·
IF 10.4
Meiling Lian,Fuxin Chen,Keyuan Zhao,Qi Yang,Da Chen
Postharvest decay of fresh fruits, driven by water loss and microbial colonization, remains a critical global challenge. Herein, we engineered a microenvironment-responsive biomimetic hydrogel featuring a physical-chemical dual-defense mechanism for zero-additive fruit preservation. This dynamic polymer network (Poly (vinyl alcohol) (PVA)/cationic chitosan/glycerol) securely anchors two dimension Vanadium carbide (2D V 2 C) MXene nanozymes. Macroscopically, a glycerol-driven hydrogen-bonding network endows the hydrogel with dynamic morphological adaptability, conforming to fruit shrinkage to lock moisture and eliminate bacteria-invading micro-cracks. Microscopically, the V 2 C nanozymes act as an intelligent H 2 O 2 -responsive system, capturing trace endogenous H 2 O 2 from microbial metabolism to trigger localized, lethal reactive oxygen species (ROS) storms without exogenous chemicals. In vivo evaluations on cherries and mandarins demonstrated that the P 90 VC 10 G coating maintained weight loss below 10% and total viable counts below 3.43 Lg CFU/g after 9 days of storage at ambient temperature. This work provides a promising protective strategy for sustainable postharvest management.
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CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Qihuang Deng,Wei Xiong,Bingshuang Mao,Maolin Bo,Yefeng Feng
Increasing the dielectric constant of polymer/sulfide ceramic composites by using wide-bandgap semiconducting sulfide ceramic fillers like ZnS is difficult because of their low interface polarization. To increase the dielectric constant, in this study, ternary polymer-based composite films were designed and fabricated using a hybrid filler consisting of shell-like ZnS particles and core-like V 2 C MXene particles. First, V 2 C MXene with a multi-layered structure was synthesized from the simplest raw materials followed by the in-situ hydrothermal growth of ZnS particles around the V 2 C particles. Then, binary polymer/ZnS and ternary polymer/V 2 C–ZnS composites were fabricated, and their dielectric, conductive, and electrical breakdown properties were investigated. Finally, the effect of interfacial bonding between the V 2 C and ZnS phases was investigated by density functional theory calculations, and the contribution of V 2 C/ZnS interfacial bonding to the higher dielectric constant of the ternary composites than that of the binary composites was explained. The ternary composites exhibited balanced electrical properties suitable for energy storage applications. The ternary composite with 10 wt% hybrid filler loading exhibited a high dielectric constant of ~52, a low dielectric loss of ~0.11 at 100 Hz, and a high electrical breakdown strength of ~202 MV m −1 . This study paves the way for the facile fabrication of high-performance composite dielectrics for application in advanced capacitors.
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Qihuang Deng,Furong Zhou,Maolin Bo,Yefeng Feng,Yuehao Huang,Cheng Peng
High dielectric response and electric insulation are desired in high-energy-density polymer/ceramic composites. Low dielectric response is found in polymer composites with semiconductors. To balance a high dielectric constant and breakdown strength, in this work, the polymer-based composites with de novo synthesized V 2 C MXene-CuO hybrid-particles were fabricated. High dielectric response of composites was attributed to strong electron polarization at ceramic/ceramic heterojunction. High insulation was ascribed to fluorine-induced electron-trap effect. The first principle calculations verified the electron-transfer mechanism at V 2 C/CuO van der Waals heterojunctions. Compared with polymer/CuO binary composites, polymer/V 2 C-CuO ternary composites exhibited the improved comprehensive electric properties (remarkably improved dielectric response and slightly damaged insulation). Ternary composite with 10 wt% V 2 C-CuO showed a high dielectric constant of 89, low dielectric loss of 0.23, low conductivity of 6.8 × 10 −7 S m −1 at 100 Hz and high breakdown strength of 204 MV m −1 . This study might enable a facile preparation of cutting-edge nanocomposite dielectrics.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
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IF 6.2
Lanlan Yu,Ningning Liu,Baojun Liu,Fei Yu,Jie Ma
Cathode materials with high capacity and cyclic durability are urgently needed for capacitive deionization . Na 3 V 2 (PO 4 ) 3 is an emerging pseudocapacitive candidate for this process on account of its high capacity and Na + reversible insertion, while it suffers from the intrinsic low electrical conductivity and small electrolyte-accessible surface area. Herein, a sea urchin-like Na 3 V 2 (PO 4 ) 3 @carbon (NVP@C) compound material was synthesized from MXene-V 2 C via hydrothermal method followed by annealing treatment, and then assembled as capacitive deionization (CDI) electrode material . Benefiting from three-dimensional sea urchin-like structure, where the nanoneedles of NVP@C serve as fast transport channel for Na + , NVP@C performed high specific capacity (437 F g −1 at 5 mV s −1 ) and fast ionic diffusion kinetics. Moreover, the NVP@C showed attractive desalination performance as cathode material for CDI, achieving a remarkable adsorption capacity of 74.0 mg g −1 in a NaCl salt solution (1000 mg L −1 ) and long life cycle stability. The present work provides a novel perspective to construct practical redox-active and stable CDI electrode with 3D structure from MXene for highly capacitive and durable desalination application .
研究领域:
材料科学
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电化学
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环境工程
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能源存储
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纳米材料
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水处理技术
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Materials Today Energy
·
2023
·
IF 9.3
Fangyuan Zhang,Xueli Zhang,Shan Hu,Huilin Hu,Jinhua Ye,Defa Wang
Photothermal catalytic carbon dioxide (CO 2 ) reduction has attracted increasing research attention as a promising method for recycling CO 2 and producing renewable energy. However, it remains a challenge in the improvement of catalytic activity with regulated product selectivity in view of practical applications. Herein, we develop the two-dimensional layered V 2 C MXene (VC) supported Ni nanoparticle and NiO nanosheet (Ni@NiO/VC) composite as an efficient catalyst for selective photothermal reduction of CO 2 to CH 4 . The optimal 0.8Ni@NiO/VC catalyst exhibits 48.1 % CO 2 conversion with an evolution rate of 33.2 mmol/g cat /h and 99.2 % selectivity for CH 4 production under a 300 W full-arc xenon lamp irradiation. Moreover, a long-term cyclic photothermal CO 2 reduction reaction demonstrates the excellent stability of 0.8Ni@NiO/VC. The enhanced photothermal CO 2 reduction activity with a high CH 4 selectivity could be attributed to the large specific surface area and excellent photothermal effect of V 2 C MXene, and the synergistic effect of Ni and NiO on adsorption/activation of H 2 and CO 2 molecules. This work provides a feasible strategy for the construction of efficient photothermal CO 2 reduction catalyst by properly incorporating transition metal nanoparticles and metal oxide with a suitable MXene.
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ADVANCED MATERIALS
·
2024
·
IF 27.4
Xiaojun He,Ya Lv,Yanling Lin,Hong Yu,Yipiao Zhang,Yuhua Tong,Chunwu Zhang
Given the challenge of multidrug resistance in antibiotics, non-antibiotic-dependent antibacterial strategies show promise for anti-infective therapy. V 2 C MXene-based nanomaterials have demonstrated strong biocompatibility and photothermal conversion efficiency (PCE) for photothermal therapy (PTT). However, the limitation of V 2 C MXene's laser irradiation to the near-infrared region I (NIR-I) restricts tissue penetration, making it difficult to achieve complete bacterial eradication with single-effect therapeutic strategies. To address this, Pt nanoparticles (Pt NPs) were attached to V 2 C, forming artificial nanoplatforms (Pt@V 2 C). Pt@V 2 C exhibited enhanced PCE (59.6%) and a longer irradiation laser (NIR-II) due to the surface plasmon resonance effect of Pt NPs and V 2 C. Notably, Pt@V 2 C displayed dual enzyme-like activity with chemodynamic therapy (CDT) and NIR-II enhanced dual enzyme-like activity. The biocatalytic mechanism of Pt@V 2 C was elucidated using density functional theory. In an in vivo animal model, Pt@V 2 C effectively eliminated methicillin-resistant Staphylococcus aureus from deep-seated tissues in subcutaneous abscesses and bacterial keratitis environments, accelerating abscess resolution and promoting wound and cornea healing through the synergistic effects of PTT/CDT. Transcriptomic analysis revealed that Pt@V 2 C targeted inflammatory pathways, providing insight into its therapeutic mechanism. This study presents a promising therapeutic approach involving hyperthermia-amplified biocatalysis with Pt NPs and MXene nanocomposites. This article is protected by copyright. All rights reserved
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
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IF 9.7
Shaobin Li,Yufeng Jiang,Jingwei Liang,Li Zhang,Fengbo Li,Xiaoqing Lv
s The development of the efficient bifunctional hydrolysis electrocatalyst is of great significance. In this work, N, Ce co-doped CoO nanoparticles (NPs) in-situ growing few-layer V 2 C-MXene interfacial structure (N, Ce-CoO NPs/MXene) has been developed as self-supporting electrodes for hydrogen production by interfacial engineering strategy. The integration of nanoparticles into the composite effectively mitigates the tendency of few-layer MXene sheets to undergo self-stacking, while simultaneously introducing a significant number of heterogeneous interfaces. The simultaneous doping of two distinct atoms modulates the electronic configuration of the active sites at heterogeneous interfaces, thereby enhancing the electron transfer processes occurring between the interfaces. The N, Ce-CoO NPs/MXene electrocatalysts exhibit excellent performance in both urea oxidation reaction (UOR) and hydrogen evolution reaction (HER), reaching 1.33 V and 86 mV at 10 mA cm −2 . The N, Ce-CoO NPs/MXene as a bifunctional catalyst for urea-assisted electrolysis can reach 10 mA cm −2 at only 1.38 V with almost no performance degradation for 100 h. In-situ Raman spectroscopy reveals the main active sites of Co as a catalyst. Density functional theory (DFT) demonstrated that the N, Ce-CoO NPs/MXene interfacial catalysts facilitate electron transfer, thereby promoting the dissociation of urea molecules through the reorganization of electrons at the interface.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2022
·Vol. 24
·期 44
·27406-27412
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IF 3.945
Xuan Yin,Haohao Chen,Lai Jiang,Chang Liang,Haosheng Pang,Dameng Liu,Bing Zhang
Two modified V2C-MXene nanocoatings are prepared through different molecular weights of polyacrylic acid (polyacrylic acid with ∼4 50 000 is marked as LPAA, and polyacrylic acid with ∼4 000 000 is marked as HPAA) and two-dimensional V2C-MXene. Their properties are characterized using a ball-on-disc tribometer, three-dimensional white-light interferometry topography images, optical microscope, Raman spectrometer, focused ion beam/scanning electron microscope and high-resolution transmission electron microscope/energy dispersive X-ray spectrometer (HRTEM/EDS). As a result, an ultralow friction (μ ≈ 0.073 ± 0.024) and an ultralow wear (3.41 × 10−7 mm3 N−1 m−1 for ball scar, and 7.49 × 10−8 mm3 N−1 m−1 for disc track) are achieved for the LPAA@V2C vs. steel ball system tested under 4 N in the air through tribo-physicochemical interactions. During the rubbing process, the LPAA@V2C nanocoating is transferred onto counter-bodies to form mixed-phase lubricative tribofilms. Monitoring via a HRTEM/EDS, the mixed-phase lubricative tribofilms are found to be mainly composed of amorphous carbon phases containing O and V and layered nano-debris along the sliding surface. The tribofilm's stable structure is the key to realizing ultralow friction and ultralow wear through the LPAA modification. These findings disclose that MXene-based nanomaterials can be applied for material engineering and mechanical engineering under common working conditions.
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JOURNAL OF ELECTRONIC MATERIALS
·
2021
·Vol. 50
·期 4
·2182-2189
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IF 1.938
Feng Yefeng,Zhao Xiaomiao,Chen Peiyao,Bo Maolin,Deng Qihuang,Zhao Anning,Fu Junjie
High-dielectric-constant (high- k ) polymer–ceramic composites with low-level dielectric loss are expected to enable excellent energy storage. However, high conductivity and high dielectric loss often occur simultaneously with high dielectric constant. To obtain a high dielectric constant but with low conductivity and low dielectric loss, in this work, we studied the ternary polyvinylidene fluoride (PVDF)/La 2 TiO 5 /V 2 C dielectric composite system, which takes advantage of the synergistic effect between the high content (0 wt.% to 40 wt.%) of pseudo-perovskite filler La 2 TiO 5 and the low content (2 wt.%) of highly conductive two-dimensional filler V 2 C. Comparisons with the binary PVDF/La 2 TiO 5 composite system revealed that the ternary PVDF/La 2 TiO 5 /V 2 C composite dielectric system enabled balance and optimization of the comprehensive electrical properties of the composite material. Significantly elevated permittivity as well as depressed low-level dielectric loss were obtained in the ternary composites. The optimized ternary composite with 40 wt.% La 2 TiO 5 and 2 wt.% V 2 C exhibited high dielectric constant of 47 and low dielectric loss of 0.17 at 1 kHz. This work might enable facile fabrication of promising composite dielectric materials based on this excellent synergetic filler strategy.
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ADVANCED FUNCTIONAL MATERIALS
·
2020
·Vol. 31
·期 8
·2008033
·
IF 16.836
Ying Liu,Yue Jiang,Zhe Hu,Jian Peng,Weihong Lai,Dianlun Wu,Shouwei Zuo,Jing Zhang,Bin Chen,Ziwen Dai,Yingguo Yang,Yang Huang,Wei Zhang,Wei Zhao,Wang Zhang,Lei Wang,Shulei Chou
Vanadium-based materials are fascinating potential cathodes for high energy density Zn-ion batteries (ZIBs), due to their high capacity arising from multi-electron redox chemistry. Most vanadium-based materials suffer from poor rate capability, however, owing to their low conductivity and large dimension. Here, we propose the application of V 2 C MXene (V 2 CT x ), a conductive 2D nanomaterial, for achieving high energy density ZIBs with superior rate capability. Through an initial charging activation, the valence of surface vanadium in V 2 CT x cathode is raised significantly from V 2+ /V 3+ to V 4+ /V 5+ , forming a nanoscale vanadium oxide (VO x ) coating that effectively undergoes multi-electron reactions, whereas the inner V-C-V 2D multi-layers of V 2 CT x are intentionally preserved, providing abundant nanochannels with intrinsic high conductivity. Owing to the synergistic effects between the outer high-valence VO x and inner conductive V-C-V, the activated V 2 CT x presents an ultrahigh rate performance, reaching 358 mAh g −1 at 30 A g −1 , together with remarkable energy and power density (318 Wh kg −1 /22.5 kW kg −1 ). The structural advantages of activated V 2 CT x are maintained after 2000 cycles, offering excellent stability with nearly 100% Coulombic efficiency. This work provides key insights into the design of high-performance cathode materials for advanced ZIBs.
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Journal of Physical Chemistry C
·
2020
·
IF 4.189
Yefeng Feng,Furong Zhou,Maolin Bo,Yuehao Huang,Qihuang Deng,Cheng Peng
High dielectric constant and breakdown strength are crucial for high-energy-density polymer/ceramic composites. Anatase-TiO2 with low dielectric constant and V2C MXene with high work function are not satisfactory fillers. In the present work, V2C–TiO2 hybrid filler was in situ synthesized, followed by fabricating poly(vinylidene fluoride) (PVDF)/V2C–TiO2 composites via solution cast. Compared with PVDF/TiO2 and PVDF/V2C composites, PVDF/V2C–TiO2 composites have an improved high dielectric constant, depressed low dielectric loss, and maintained high breakdown strength. High overall electric traits are ascribed to the synergy of conductive V2C and semiconductive TiO2. Outer and inner surfaces of V2C were ornament-combined by anatase-TiO2 particles having surface point defects as electron traps, contributing to low interface leakage conduction. Through density functional theory (DFT) calculations, nontypical V–F–Ti-bonding-induced dipole enhancement and Fermi-level (EF) overlapping-induced high electron localization mechanisms improve the dielectric response. Ternary composite with 10 wt % hybrid filler exhibits a dielectric constant of ∼99, a dielectric loss of ∼0.24 at 1 kHz, and a breakdown strength of ∼189 MV/m. This work might enable large-scale preparation of promising polymer/MXene composite dielectrics.
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 6
·125503
·
IF 7.5
Jixu Han,Jing Xu,Xingpei Yang,Yanan Wang,Jiayao Ren,Siming Lan,Jiandong Wu
Constructing a Co─N C─V covalent bridge as an electron highway. • Achieving ultrafast charge separation and 5 times higher hydrogen evolution. • Integrating Schottky junction and molecular wire for directed charge flow. We introduce an “electron highway” concept to overcome stochastic charge loss in heterojunctions, realized by a Co─N C─V covalent bridge at the Ni‑Co PBA/V 2 C MXene interface. This molecular‑scale wiring, combined with a Schottky contact, creates a directed and atomically precise charge transfer pathway from the photoactive PBA to the conductive MXene. The resultant photocatalyst shows a remarkable H₂ production of 13697 μmol h −1 g −1 under visible light, a 5‑fold increase, enabled by picosecond‑scale electron injection and minimized recombination, as evidenced by in‑situ XPS and TRPL. The robust interfacial bond ensures sustained activity over 25 h cycling. This work provides a generalizable, molecular‑scale strategy for designing high‑efficiency interfaces for photocatalysis and beyond. Download: Download high-res image (241KB) Download: Download full-size image
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