Sensors & Diagnostics
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2022
·Vol. 1
·期 5
·1080-1087
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IF 0
Feng Wang,Hongye Wang,Xiaoqiang Cui,Yang Liu
Innovating the fluorescence characteristic of MXene nanosheets and quantum dots could result in fascinating perspectives in the applications of sensing, imaging and photocatalysis. However, the currently reported MXene-based materials have only shown down-conversion fluorescence emission, while the exploration and research of up-conversion fluorescent performance are scarce. Herein, the upconversion emission behaviors of Ti3C2 MXene nanosheets are reported and investigated for the first time. It was observed that the Ti3C2 nanosheets present upconversion emission in a wide wavelength range with adjustable color, covering almost the entire visible spectrum. The unique features of larger anti-stokes displacement (over 200 nm), narrower full width at half maximum (∼17 nm) and longer lifetime (1.18 μs) were also exhibited, which are superior to those of the down-conversion fluorescence. The self-quenched fluorescence of the Ti3C2 nanosheets on the side of the highest fluorescence emission was also displayed. Based on the quenching effect of L-tryptophan on the Ti3C2 fluorescence by a fast charge transfer mechanism, a fast, simple and label-free fluorescence sensor for L-tryptophan detection was realized with a detection limit as low as 91 nM, which provides a valuable tool to widen their applications in food safety and diagnostics.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Han Wang,Xinming Wu
As an emerging family of conductive 2D materials, MXenes, have gained much attention as electrode in supercapacitor devices. Their representative, Ti 3 C 2 T x , usually achieves significant capacitance in common acid electrolyte. In this work, through a simple dipicolinic acid (DC) intercalation strategy, Ti 3 C 2 T x -DC can obtain outstanding capacitance in a more environmentally friendly KCl aqueous electrolyte. As a consequence, as an electrode for supercapacitor, Ti 3 C 2 T x -DC exhibits an outstanding specific capacitance of 353 F g −1 at a current density of 0.5 A g −1 in KCl aqueous electrolyte (MXene-DC/KCl), which is higher than MXene of 320 F g −1 in H 2 SO 4 electrolyte (MXene/H 2 SO 4 ) and MXene of 127 F g −1 in KCl aqueous electrolyte (MXene/KCl). Moreover, the MXene-DC/KCl shows an impressive cycling stability with about 100% capacitance retention after 10,000 cycles at 1.0 A g −1 . Such excellent electrochemical performance in a greener electrolyte is mainly attributed to the interlayer hydration of DC and counter ion adsorption of electrolyte.
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JOURNAL OF MATERIALS SCIENCE
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2025
·
IF 3.9
Chen Huyue,Li Yitao,Wang Jingrong,Lu Tengfei,Xu Haiping,Yang Dandan,Chen Lifei
As the demand for lightweight and compact integrated devices accelerates, dielectric materials are pivotal in enabling efficient energy storage. Composite materials, particularly those combining a polymer matrix with two-dimensional (2D) conductive MXene fillers, have emerged as promising candidates for improving dielectric performance. However, their high dielectric constant is often accompanied by significant dielectric loss, limiting their application in high-frequency circuits and electronic devices. This study investigates a ternary composite system consisting of polyvinylidene fluoride (PVDF) as the matrix, Ti 3 C 2 T x MXene as a conductive filler, and strontium titanate (SrTiO 3 ) as a ceramic filler to enhance dielectric properties. The ternary composites were prepared through a combination of physical mixing followed by a hot-pressing process. The results demonstrate that the MXene/SrTiO 3 /PVDF composites achieve a notable reduction in dielectric loss while retaining a high dielectric constant. At 12 wt% MXene, the composite achieves a dielectric constant of 117.8 at 10 3 Hz, 14.7 times higher than pure PVDF, with dielectric loss reduced by 71.4% compared to MXene/PVDF composites. Furthermore, the incorporation of SrTiO 3 markedly enhances the thermal stability, elevating the thermal decomposition temperature of the composite to 437.88 °C, up from 357.9 °C for pure PVDF. This research presents a promising strategy for developing capacitors with superior dielectric properties and enhanced thermal stability, suitable for high-temperature applications.
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APPLIED THERMAL ENGINEERING
·
2024
·
IF 6.1
Zhiyuan Zhang,Ning Zhang,Jintao Li,Lei Chen,Xing Cao
Although the phase change material (PCM) is increasingly recognized for its potential in battery thermal management application, the effectiveness of PCM is hindered by issues such as high rigidity, prone leakage and low thermal conductivity. To get rid of such predicament, a novel flexible composite PCM containing the myristyl alcohol/olefin block copolymer/MXene is fabricated and tested in this paper, and then the applicability of this composite PCM on battery thermal management is evaluated through numerical simulation. The results indicate that the MXene enhances the thermal conductivity of the composite PCM, and up to 207 % increment is acquired by 15 wt% MXene. The excellent thermally-induced flexibility of the composite PCM is realized owing to the olefin block copolymer. Under the cooperative action of the MXene and the olefin block copolymer, the composite PCM features outstanding thermal reliability. As for the battery cooling application, the composite PCM features superior characteristic than the air. Considering the better thermal control performance, the low MXene addition in the composite PCM is appropriate for the high discharge rate, while the high MXene addition is suitable for the low discharge rate. The PCM thickness between parallel batteries exerts greater impact on battery thermal management in contrast to the PCM thickness between series batteries. The prepared composite PCM can meet the thermal control requirements when the ambient temperature is 20–35 °C.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Shuwen Jin,Guangyao Zhang,Zhanyue Huo,Libei Feng,Mengyi Liu,Zhiyuan Sun,Diab Khalafallah,Jue Wang,Qinfang Zhang
Hydrogen energy, as a clean and renewable alternative to fossil fuels, requires efficient electrocatalysts for sustainable hydrogen production via the hydrogen evolution reaction (HER). Platinum-based catalysts exhibit superior HER activity but face challenges of high cost, instability, and aggregation under acidic conditions. MXenes, two-dimensional materials with high conductivity and tunable surface chemistry, offer promising support platforms to enhance platinum utilization. Here, we report the design of highly active and stable HER catalysts by anchoring sub-nanometer platinum clusters onto lamellar Ti 3 C 2 and Nb 2 C MXenes via a cluster beam deposition technique. The optimized Pt/Ti 3 C 2 catalyst achieves a low overpotential of 67 mV at 10 mA cm −2 in acidic media, outperforming Pt/Nb 2 C (72 mV), pure Pt clusters (79 mV), and commercial Pt/C (82 mV). This enhancement arises from Ti 3 C 2 's larger surface area, which stabilizes Pt clusters, prevents aggregation, and facilitates interfacial electron transfer. The Pt/Ti 3 C 2 heterojunction also demonstrates a Tafel slope of 26.3 mV dec −1 , indicating rapid Volmer-Tafel kinetics, and retains 95 % activity after 5 h of operation. Compared to prior Pt/MXene systems, this work highlights the critical role of MXene surface functionality and Pt cluster dispersion in optimizing HER performance. By reducing platinum loading while maintaining high efficiency, this strategy advances the development of cost-effective electrocatalysts for scalable green hydrogen production. Our findings provide a blueprint for engineering MXene-supported metal clusters to address energy and sustainability challenges.
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Nature Communications
·
2025
·Vol. 16
·期 1
·1-11
·
IF 15.7
Bo Zheng,Wang Rui,Wang Bin,Sunny Sanjay,Zhao Yuping,Ge Kangkang,Xu Kui,Song Yajing,Raymundo-Piñero Encarnacion,Lin Zifeng,Shao Hui,Yu Qian,Yan Jianhua,Cen Kefa,Taberna Pierre-Louis,Simon Patrice
Clarifying the relationship between ion desolvation, ion-electrode interactions, and charge storage capacity during ion intercalation in host electrode materials is crucial for advancing fast and efficient energy storage systems. However, the absence of direct evidence for ion desolvation and lack of detailed understanding of the interactions between surface terminations and intercalated cations (Li ions)/solvents hinder the exploration of their effects on energy storage mechanisms. In this paper, we study the intercalation of Li ions from a non-aqueous electrolyte in two-dimensional metal carbides Ti 3 C 2 MXenes with different surface chemistries: HF-Ti 3 C 2 (F-, OH- and O-terminated) and MS-Ti 3 C 2 (O- and Cl-terminated) MXenes. We are able to visualize the full ion desolvation and solvents-ions co-intercalation in the interlayers of MS-MXene and HF-MXene, respectively at the atomic scale. The combination of several techniques and characterization tools reveal that the complete ion desolvation in Cl- and O-terminated MS-Ti 3 C 2 MXenes is associated with the formation of a dense solid electrolyte interface layer, resulting in improved charge storage capacity. The O-rich surface terminations of MS-MXenes are found to be responsible for the efficient Li ions storage. These findings shed lights on identifying the critical role of non-electrostatic ion-electrode interactions and ion desolvation in designing high-performance energy storage devices.
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PubMed
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
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IF 8.5
Junzheng Chen,Xue Lv,Xikun Zhang,Huiwen Jia,Yanmin Ma,Wang Xu,Xiaoning Yang,Di Fang,Shurui Yi
Conductive hydrogels are valued for their flexibility and sensitivity for flexible wearable sensors, but they typically focus on strain sensing and lack features such as fast temperature response. In addition, discarded sensors can cause environmental problems. Based on this, we developed a novel G 2 B 3 M 4 hydrogel using NIPAAm, AM, PDA@BN, MXene, and SA to achieve dual response to temperature and strain as well as reuse after disposal. The addition of the copolymerized hydrophilic monomer AM successfully changed the lowest critical solution temperature (LCST) of G 2 B 3 M 4 to approach the normal body temperature. In addition, the excellent dispersion of PDA@BN in the G 2 B 3 M 4 hydrogel not only improved its temperature sensitivity (TCR = −1.953 %/°C) but also resulted in a high stress (730.38 kPa), strain (6994.18 %), elasticity (49.14 kPa) and toughness (2644.17 KJ/m 3 ). In addition, the abundant catechol groups, amino groups and carboxyl groups in G 2 B 3 M 4 hydrogel not only make it have good adhesion to various substrates but also can be used as a template to reduce Ag + to Ag NPs to serve as a catalyst for the efficient degradation of dye wastewater. The hydrogel has good application prospects in the field of flexible sensors.
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RSC Advances
·
2025
·Vol. 15
·期 21
·16257-16265
·
IF 4.6
Guangyao Zhang,Deqi Fan,Zongze Li,Yingying Li,Yi Lu
Solar-driven interfacial evaporation has emerged as a sustainable solution to address global freshwater scarcity by converting solar energy into thermal energy for efficient water purification. To achieve rapid and energy-efficient steam generation, the development of advanced photothermal materials with optimized light absorption and water activation remains critical. Here, we present a three-dimensional polyvinyl alcohol/chitosan/Nb2C MXene (PCN) hydrogel engineered for high-performance solar evaporation. The composite integrates Nb2C MXene nanosheets into a hydrophilic polymer matrix through hydrogen bonding and electrostatic interactions, forming interconnected microchannels that enable broadband solar absorption (93% across 300–2500 nm) via MXene's plasmonic effects and light-trapping architecture. The synergistic combination of rapid water transport and weakened hydrogen bonding within the hydrated network significantly reduces the evaporation enthalpy to 1426 J g−1. This design achieves an exceptional evaporation rate of 2.72 kg m−2 h−1 and a solar-to-vapor conversion efficiency of 93.2% under 1 sun irradiation, surpassing conventional hydrophilic polymer-based systems. The hydrogel's hierarchical porous structure facilitates effective thermal localization and sustains stable evaporation across varying solar intensities (1–5 sun), demonstrating adaptability for scalable applications. This work provides a rational strategy to design MXene-enhanced hydrogels for practical solar desalination and wastewater purification technologies.
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Advanced Materials Interfaces
·
2019
·Vol. 6
·期 6
·1802040
·
IF 4.713
Zehang Zhou,Jize Liu,Xinxing Zhang,Dong Tian,Zeying Zhan,Canhui Lu
Ultrathin and high-performance electromagnetic interference (EMI) shielding materials are urgently demanded for modern microelectronic devices. 2D metal carbides (MXenes) are considered as a promising EMI shielding material due to its metallic conductivity. In this study, sodium alginate is applied as interlayer spacer for Ti 3 C 2 T x nanosheets, which not only prevents the restacking of lamella structure but also serves as building blocks for the sponge-like structure. Ultrathin Ti 3 C 2 T x /calcium alginate (CA) aerogel films with sponge-like structure and only tens of microns thickness are prepared through divalent metal ion induced crosslinking, vacuum-assisted-filtration induced self-assembly, and freeze-drying. Taking advantage of its sponge-like structure, which facilitates the dissipation of incident electromagnetic waves through multireflection and scattering Ti 3 C 2 T x /CA aerogel film, presents excellent EMI shielding effectiveness (54.3 dB) at a very low thickness of 26 µm. Furthermore, Ti 3 C 2 T x /CA aerogel film shows an outstanding specific EMI shielding efficiency (17586 dB cm 2 g −1 ), which is superior to most reported synthetic materials. The preparation of ultrathin Ti 3 C 2 T x /CA aerogel film provides facile strategy for designing and fabricating high-performance MXene-based EMI-shielding materials, which is highly desirable for various applications including aerospace and smart electronic devices.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Tangdong Feng,Wanxia Huang,Hongfu Zhu,Xueguang Lu,Sujit Das,Qiwu Shi
The modulation of the terahertz (THz) wave is fundamental for its applications in next-generation communications, biological imaging, sensing, and so forth. Searching for higher efficient modulation is still in progress, although plenty of materials have been explored for tuning THz wave. In this work, optical-transparent self-assembled MXene films are used to modulate the THz reflection at the SiO2/MXene/air interface based on the impedance matching mechanism. By adjusting the number of stacked MXene layers/concentrations of MXene dispersions, the sheet conductivity of the MXene films will be changed so that the impedance at the SiO2/MXene/air interface can be tuned and lead to a giant modulation of THz reflection. Particularly, we demonstrate that the MXene films have highly efficient THz modulation from antireflection to reflection-enhancing with a relative reflection of 27% and 406%, respectively. This work provides a new pathway for developing the MXene films with the combination of optical-transparency and high smart THz reflection characteristics, and the films can be applied for THz antireflection or reflection-enhancing.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2019
·
IF 2.752
Chongyan Hao,Yuan Liao,Yang Wu,Yajing An,Jiannan Lin,Zhengfei Gu,Minhong Jiang,Shi Hu,Xiaotian Wang
In this work, we report RuO 2 -loaded TiO 2 –MXene hybrid nanostructure as a promising photocatalyst possessing remarkable activity for photocatalytic nitrogen fixation in water at room temperature. The MXene was synthesized by HF etching of the precursor Ti 3 AlC 2 and used as the substrate for the growth of RuO 2 nanoparticles and TiO 2 through a hydrothermal reaction . The benign activity is mainly attributed to the synergetic effect among MXene, TiO 2 , and RuO 2 in photocatalytic ammonia synthesis by combining light harvesting and nitrogen activation.
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ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Shuyue Yang,Dongmei Zhang,Jie Xu,Zongping Zhang,Shibing Ni
High theoretical capacity and safety performance endow Li 3 VO 4 with great promising as anode material for Li-ion batteries. However, approaches and inner mechanisms to advance the performance of Li 3 VO 4 are limited. Herein, we demonstrate for the first time, continuously-high pseudocapacitive charge storage triggered by N doped MXene in a Li 3 VO 4 -based electrode, resulting in excellent comprehensive electrochemical performance. The hybrid electrode delivers high discharge capacity of 515.2 mAh g −1 after 500 cycles at 0.1 A g −1 . After periodic rate performance test from 0.1 to 2.0 A g −1 for 410 cycles, the capacity of the hybrid electrode can be fully recovered. Followed by additional 1000 cycles at 0.5 A g −1 , the hybrid electrode still delivers high discharge capacity of 457.6 mAh g −1 . The robust capacitive charge storage induced by N doped MXene and the remarkable comprehensive electrochemical performance are referential for the design of high performance Li 3 VO 4 -based anode material, and the facile approach is beneficial for mass production toward practical application. Graphical abstract Download : Download high-res image (210KB) Download : Download full-size image N doped MXene induced robust pseudocapacitive charge storage in a Li 3 VO 4 electrode is firstly demonstrated responsible for the excellent comprehensive electrochemical performance.
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