ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Yuelin Lu,Jie Bai,Binbin Sun,Nannan Li,Zhenhuai Yang,Hailing Yu,Cong Wang,Cong Gu,Huan Liu,Peng Tang,Qiang Wang
MXene materials exhibit substantial energy storage capabilities owing to their high specific surface areas, tunable interlayer spacings, and excellent electrical conductivities. However, these layers are prone to re-stacking, negatively affecting the energy storage capacity of the material. Herein, through a process involving liquid nitrogen-assisted freeze-drying and subsequent annealing, Ti 3 C 2 T x nanosheets were combined with polyvinyl alcohol (PVA) polymer chains via hydrogen bonding to produce MXene and PVA-derived carbon composite aerogels (MPAs) with microstructures ranging from ordered to disordered arrangements. The incorporation of PVA inhibited nanosheet stacking, and PVA carbonization enhanced the electrical conductivity of the aerogel. The carbonized aerogel (MPA2.0) exhibited a larger specific capacitance along with a more disordered and denser microstructure, thereby accounting for the increased capacitance due to enhanced ion storage in the more structurally disordered carbon nanopores. The optimized MPA aerogel demonstrated a high power density, along with an excellent specific capacitance (MPA2.0 = 348.14 F g −1 , 2 mV s −1 scan rate), and a cycling stability of 92.52 % after 10,000 charge/discharge cycles. Furthermore, the MPA2.0-based supercapacitor obtained an impressive energy density (37.8 Wh kg −1 ) and an exceptionally high power density (1800 W kg −1 ) at a current density of 1 A g −1 . By adjusting the PVA loading, the shrinkage and stress–strain characteristics of the microstructure during freeze-drying and carbonization were altered, and the microstructural orientation of the resulting aerogels was controlled. The increased disorder in the aerogel enhanced its capacitor energy storage ability, providing a new approach for the design of multi-component high-performance hybrid supercapacitor electrodes.
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高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2025
·
IF 3.2
Huolin Zhong,Hui Fang,Zhao Yan,Fangjuan Wu
MXenes, two-dimensional transition metal carbides and nitrides, show great potential in various applications. However, traditional synthesis methods often involve toxic fluorine-containing etchants, limiting large-scale production. This study introduces a novel, environmentally friendly approach for synthesizing Ti 3 C 2 T x MXene nanosheets using stone grinding-assisted exfoliation and mild alkaline etching at 80°C. The synthesized MXene nanosheets exhibited high aspect ratios with transverse dimensions mostly on the micrometer scale and a thickness of approximately 3 nm, corresponding to one to two layers of Ti 3 C 2 . MXene/polyvinyl alcohol (PVA) composite membranes were fabricated to demonstrate practical applications. The composite membrane containing 1 wt% MXene achieved a 99.9% UV shielding rate while maintaining 67% visible light transmittance. Furthermore, it significantly enhanced PLA's UV resistance, with protected samples retaining 98.1% tensile strength after 48 hours of UV exposure, compared with 47.8% for unprotected PLA. This fluorine-free synthesis method addresses environmental concerns and enables large-scale MXene production for advanced UV protection applications. Highlights Ti 3 C 2 T x MXene is made via stone grinding and alkaline etching. MXene nanosheets are produced in the micron range and are 1–2 layers thick. The fluorine-free synthesis enables green, large-scale production of MXene. MXene/PVA films show 99.99% UV shielding with 67% visible light transmittance. MXene/PVA coating improves PLA's UV resistance, keeping 98.1% of tensile strength.
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MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Zhiwen Shi,Lijuan Qiao,Zhi Jia,Peng Zhang,Bingxin Liu,Li Gao
It is of great significance to detect methanol in human exhaled breath since it may cause neurological disorders. In this study, N-doped Ti 3 C 2 T x MXene was synthesized by annealing and nitrogen doping in clay-like Ti 3 C 2 T x MXene. Then, TiO 2 nanospheres was generated in situ on the surface of N-doped Ti 3 C 2 T x MXene to provide adsorption and reaction sites for methanol. Based on the synergistic effects of electronic properties and gas adsorption, the N-Ti 3 C 2 T x MXene/TiO 2 exhibits high responsiveness and excellent selectivity to methanol at room temperature. Moreover, the detection limit is 0.1194 ppm. In addition, the adsorption and oxidation process of methanol on the N-Ti 3 C 2 T x MXene/TiO 2 was explored by in situ infrared spectra testing to reveal that the oxygen vacancy on the surface of N-Ti 3 C 2 T x MXene/TiO 2 plays an important role in the selective detection of methanol. This experiment provides a feasible solution for the detection of methanol gas in exhaled breath at room temperature.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Lu Tang,Huimin Yang,Huajing Wang,Yazhou Yang,Xiaoxia Wang,Gen Tang,Dawen Zeng
The abundant tunable functional groups and room-temperature sensing properties of MXenes have garnered increasing interest in the field of gas sensing. However, the majority of research has exclusively focused on the combined impact of external substances with MXenes functional groups, with limited exploration into the modulation of MXenes’ intrinsic functional groups. In this work, we successfully produced molten salt-modified Ti 3 C 2 T x MXene (M-Ti 3 C 2 T x ) with tunable oxygen-functionalized surfaces using the molten salt immersion method and employed it as a chemical resistive gas sensor to detect NO 2 at room temperature (RT). Using diverse analytical techniques, we propose the O−addition effect on the surface titanium atoms and the O−substitution effect on the edge carbon atoms, refining the existence form of –O functional groups as well as realizing the effective regulation of the intrinsic functional groups. With a high response (∼25.87%−100 ppm NO 2 , whose response value is five times higher than that of pristine Ti 3 C 2 T x ), relatively rapid response speed (∼99 s−25 ppm NO 2 ), high sensitivity (∼0.29 ppm −1 ), low detection limits (theoretical LoD is 3.3 ppm), good selectivity and long-term stability (maintain stable within 28 days) at RT, the sensor based on M-Ti 3 C 2 T x demonstrates excellent NO 2 sensing performance. To understand the sensing mechanism, density functional theory (DFT) calculations were conducted to explore adsorption behaviors. Theoretical analysis validates that M-Ti 3 C 2 T x has a stronger adsorption capacity for NO 2 (E ad = −1.149 eV) owing to the formation of covalent bond between the –O functional group and the nitrogen atom of NO 2 . The application of the molten salt can effectively modulate the intrinsic functional groups of MXenes, expanding the scope of MXenes surface modification engineering and creating new opportunities for enhancing the gas sensing capabilities of MXenes.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Debin Cai,Shuai Wu,Zhen Tian,Li Guo,Yanzhong Wang
The self-assembled aerogels are considered as an efficient strategy to address the aggregation and restacking of Ti 3 C 2 T x MXene nanosheets for high-performance supercapacitors. However, the low mechanical strength of the MXene aerogel results in the structural collapse of the self-standing supercapacitor electrode materials. Herein, a low-cost melamine sponge (MS) absorbed different cations (H + , K + , Mg 2+ , Fe 2+ , Co 2+ , Ni 2+ and Al 3+ ), serves as a carrier and crosslinker for loading MXene hydrogel induced by the absorbed cations on the skeleton surface and the pores of MS, resulting in the high loading mass MXene aerogels with high mechanical strength. The experimental results show that the Mg-Ti 3 C 2 T x @MS aerogel exhibits the maximum area capacitance of 702.22 mF cm −2 at 3 mA cm −2 , and the area capacitance is still 603.12 mF cm −2 even at 100 mA cm −2 , indicating the high rate capability with a capacitance retention of 85.89 %. It is worth noting that the constructed asymmetric supercapacitor with activated carbon achieves high energy densities of 104.53 μWh cm −2 and 93.87 μWh cm −2 at 800 μW cm −2 and 7999 μW cm −2 , respectively. Furthermore, the asymmetric supercapacitor shows the high cycling stability with 90.2 % capacity retention after 10,000 cycles. This work provides a feasible strategy to prepare Ti 3 C 2 T x MXene aerogels with large layer spacing and high strength for high-performance supercapacitors.
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高影响因子
RARE METALS
·
2024
·
IF 9.6
Li Zhao-Yang,Zhao Wei-Jun,Sun Yu,Zhou Bing,Feng Yue-Zhan,Liu Chun-Tai
The pressing demand for ultrathin and flexible shields to counter electromagnetic interference (EMI) has sparked interest in Ti 3 C 2 T x MXene materials due to their exceptional electrical conductivity, tunable surface chemistry, and layered structure. However, pure Ti 3 C 2 T x MXene films often lack the mechanical properties required for practical engineering applications, and traditional reinforcement methods tend to reduce electrical conductivity. This work demonstrates an effective strategy to enhance the alignment and densely packed layered structure of Ti 3 C 2 T x MXene films by regulating the acidity and alkalinity of Ti 3 C 2 T x MXene aqueous solutions. This approach simultaneously improves mechanical strength and electromagnetic interference shielding effectiveness (EMI SE). Compared with original Ti 3 C 2 T x MXene films, MXene films modified with ammonia solution (NH 3 ·H 2 O) via OH − show a significant improvement in tensile strength (27.7 ± 1.9 MPa). Meanwhile, MXene films treated with hydrochloric acid (HCl) via H + reach an even higher tensile strength of 39 ± 1.5 MPa. Moreover, the EMI SE values of the treated MXene films increase significantly, each reaching 66.2 and 58.4 dB. The maximum improvements in EMI SE values for the acid- and alkali-treated samples are 17.9% and 4%, respectively. In conclusion, the simultaneous enhancement of mechanical strength and EMI shielding efficacy highlights the potential of acid- and alkali-treated Ti 3 C 2 T x MXene films for applications in ultrathin and flexible EMI shielding materials. Graphical abstract
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Li Zhang,Chao Li,Yue Chen,Shaobin Li,Xue Wang,Fengbo Li
L-tryptophan (L-Trp) is crucial for human metabolism, and its imbalance or deficiency can lead to certain diseases, such as insomnia, depression, and heart disease. Since the body cannot synthesize L-Trp and must obtain it from external sources, accurately monitoring L-Trp levels in food is essential. Herein, a nanocomposite film based on polyoxometalate (P 2 Mo 17 V), Ti 3 C 2 T x MXene , and chitosan (Cs) was developed through a green electrostatically mediated layer-by-layer self-assembly strategy for electrochemical detection of L-Trp. The composite film exhibits fast electron transfer and remarkable electrocatalytic performance for L-Trp with a wide linear range (0.1–103 μM), low limit of detection (0.08 μM, S/N = 3), good selectivity, reproducibility, and repeatability. In milk sample, the recoveries of L-Trp were from 95.78% and 104.31%. The P 2 Mo 17 V/Cs-Ti 3 C 2 T x electrochemical sensor not only provides exceptional recognition and detection capabilities for L-Trp but also shows significant potential for practical applications, particularly in food safety and quality control .
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高影响因子
POLYMER COMPOSITES
·
2024
·Vol. 45
·期 10
·9196-9208
·
IF 4.8
Ningmin Duan,Yong Li,Zhenyu Shi,Jilai Wang,Chengpeng Zhang,Xuefeng Tang,Guilong Wang
Nowadays, it is still a huge challenge to predict the interlaminar shear strength (ILSS) of three-phase carbon fiber reinforced polymer (CFRP). Herein, the three-phase micromechanical model is innovatively constructed to predict the ILSS of CFRP, and the conception of new matrix is proposed by establishing a connection between the third phase and the matrix, which effectively solves the problem of uneven distribution of the third phase. To verify the accuracy of the micromechanical model, the Ti 3 C 2 T x MXene/CFf/epoxy composites were fabricated by the co-blending, layer-by-layer assembly and hot-pressing technology, and the finite element simulation analysis was also performed based on the micromechanical model. The results show that the micromechanical model possesses high accuracy. Specifically, the experimental value of ILSS of the composite with 1 wt% Ti 3 C 2 T x MXene content is 52.12 MPa, and the errors of simulation value (56.64 MPa) and theoretical prediction value (58.69 MPa) are 8.67% and 12.61% MPa, respectively. Besides, the detailed fracture mechanism of the composite is presented based on the fracture morphology and simulation results. It is believed that this work will provide more possibilities for the prediction of the interlaminar shear performance of three-phase composites. Highlights A novel micromechanical model is used to predict the ILSS of three-phase composite. The accuracy of the micromechanical model is verified by simulation and experiment. The main failure form of the Ti 3 C 2 T x MXene/CFf/epoxy composite is matrix broken. The micromechanical model of the three-phase composites has high accuracy.
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高影响因子
Nanoscale
·
2024
·Vol. 16
·期 9
·4811-4825
·
IF 5.8
Menghan Guo,Wenqing Wang,Bin Zhai,Jingtao Li,Liran Zhang,Jingchun Li,Kexin Luo,Rui Wang
Flammability feature of textiles is a big underlying risk causing fire disasters. The fabrication of reliable fire resistant and quick fire warning fabrics is imperative but challenging. Herein, three types of early fire-warning polyester fabrics, namely, FPP@AM-X, FPP@PM-X and FPP@AX-M1, with good flame retardant and piezoresistive sensing performance were developed by fabricating polyethyleneimine (PEI), ammonium polyphosphate (APP), phytic acid (PA) and MXenes onto phosphorus-containing flame retardant polyethylene terephthalate (FRPET) via polydopamine (PDA) mediated layer-by-layer self-assembly. Owing to the improved thermoelectric properties of MXenes, FPP@A5-M1 exhibited a maximum thermoelectric voltage of 0.59 mV at a temperature difference of 130 °C and can provide an ideal cyclic early fire warning response within 4 s. In addition, due to the synergistic flame retardant effect of MXenes and APP in the coating layer, FPP@A5-M1 could be self-extinguished within 2 s after ignition and the value of peak heat release ratio and total smoke production decreased by 41.9% and 30.4%, respectively. Besides, the MXene-based hybrid coated fabric can detect the movement of human fingers and elbows, illustrating its potential application in piezoresistive tension sensing. This work provides a new route to designing and developing multi-functional and smart fire protection fabrics.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Ziyi Li,Jia Xiong,Hang Song,Shuchang Liu,Yufei Huang,Yangqiang Huang,Geoffrey I. N. Waterhouse,Ziyun Wang,Yu Mao,Zhiwu Liang,Xiao Luo
To enhance the photocatalytic efficiency of ZIF-67 (Zeolitic Imidazolate Framework-67), we integrated it with Ti 3 C 2 T x MXene through in-situ synthesis and assessed the effects of different MXene concentrations on photocatalytic activity. We identified ZIF-67/Ti 3 C 2 T x MXene as the optimal catalyst (denoted as ZT-450), yielding CO, CH 4 , and H 2 at 62.7, 6.7, and 7.3 μmol g −1 , respectively. The CO productive rate achieved by ZT-450 exhibits a substantial enhancement, outperforming both ZIF-67 and Ti 3 C 2 T x by factors of 16.1 and 4.8, respectively. After introducing Ti 3 C 2 T x in ZIF-67, CO 2 adsorption ability achieves 127.90 μmol g −1 , much higher than those of pure ZIF-67 and Ti 3 C 2 T x . Combining Density Functional Theory (DFT) calculations, we established that introducing Ti 3 C 2 T x in ZIF-67 facilitates rapid electron transfer and improves light absorption, CO 2 activation. In-situ DRIFTS measurements of photocatalytic CO 2 reduction reaction (CO 2 RR) on ZIF-67/Ti 3 C 2 T x MXene composite were employed to reveal the emergence of intermediates such as *COOH, *CHO, *OCH 3 , etc ., and elucidate the mechanism accordingly. This research contributes to the advancement of photocatalytic CO 2 RR, offering insights into applying Ti 3 C 2 Tx MXene in photocatalysis.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xukang Han,Yuanhang Zhang,Jinhu Hu,Jiao Liu,Mingliang Ma,Yuhao Feng,Xiyao Wang,Guoxu Sun,Wei Gao,Yonglei Chi,Zihan Guo
With the advancement of wireless communication and electronic equipment , microwave absorption materials (MAMs) have more and more broad applications in related fields. Ti 3 C 2 T x -MXene with unique two-dimensional structure and excellent dielectric properties is often used as a precursor of nano-TiO 2 , which is a potential MAMs. Carbon nanofibers , as a one-dimensional material, have great electrical conductivity and can form interconnected three-dimensional conductive networks. In this study, Ti 3 C 2 T x -MXene was prepared by in-situ HF etching method, and further combined with the benefits of Co, Ce metals, and carbon nanofibers. Co/CeO 2 /TiO 2 /CNFs were prepared via a facile technique for electromagnetic microwave (EM) absorption, exhibiting excellent EM absorption performance due to the synergistic effects of dielectric and magnetic properties . The minimum reflection loss (RL min ) and effective absorption bandwidth (EAB) reache −63.35 dB (11.2 GHz) and 3.6 GHz (9.5–13.1 GHz), with a thickness of only 2.35 mm and a filling rate of 30 wt%, while the maximum EAB reaches 5.4 GHz (12.4–17.8 GHz) with a thickness of 1.82 mm, covering nearly the entire Ku band. By offering a novel strategy to the creation of brand-new, high-performance MAMs based on 1D carbon nanofibers with dielectric/magnetic synergy, this work is believed to support the development of upcoming MAMs.
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yiming Wang,Jin Chen,Jianye Shi,Jing Zhang,Yuzhao Ma,Xiaofeng Yang,Yanjun Li
The integration of microscopic material designs and macroscopic structural layouts offers unlimited potential for developing advanced electromagnetic wave (EMW) absorbers. Herein, a pyrolysis-based strategy is reported for the hybridization of Ti 3 C 2 T x MXene nanosheets to achieve relaxation processes and high-density magnetic coupling at the nanoscale. The stratified structure of Ti 3 C 2 T x /Fe-MOF considerably amplifies the active contact region with electromagnetic radiation, thereby inducing numerous reflection/scattering phenomena. Through pyrolytic transformation, derived nanoparticles including Fe, C, Fe 3 O 4 , and TiO 2 establish continuous metal–carbon and carbon-oxide interfaces below 50 nm. Consequently, the heterogeneous interfaces formed between these components establish a harmonious electromagnetic coupling network, where interfacial polarization from numerous heterojunctions promotes charge accumulation and relaxation processes, converting electromagnetic energy into thermal energy. Remarkably, findings indicate that this composite material demonstrates a minimum reflection loss (RL min ) of −47.05 dB when the thickness reaches 1.8 mm. Additionally, this investigation broadens the spectrum of design strategies for premium microwave absorption materials through systematic interface engineering and thermally-controlled phase conversion.
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危险品化学品经营许可证（带存储）