LANGMUIR
·
2024
·
IF 3.7
Xiaoyu Mao,Yi He,Changhua Li,Hongjie Li,Rui Gou,Haitao Liu,Yang Zhao,Wen Chen,Jing Yan,Xi Yuan,Guiyang Wu
Improving the dispersibility and compatibility of nanomaterials in water-borne epoxy resins is an important means to improve the protection ability and corrosion resistance of coatings. In this study, glycine-functionalized Ti3C2Tx (GT) was used to prepare an epoxy composite coating. The results of Fourier transform infrared spectroscopy and X-ray diffraction showed that glycine was successfully modified. The scanning electron microscopy and transmission electron microscopy results showed that the aggregation of Ti3C2Tx was alleviated. Electrochemical impedance spectroscopy test results show that, after 60 days of immersion, GT coating still shows the best protection performance, and the composite coating |Z|f = 0.01 Hz is 3 orders of magnitude higher than that of the pure epoxy coating. This is mainly because, after adding glycine, the −COOH group on the surface of glycine binds to the −OH group on the surface of Ti3C2Tx, improving the aggregation of Ti3C2Tx itself. At the same time, the −NH group of glycine can also participate in the curing reaction of epoxy resin to strengthen the bonding strength between the coating and the metal. The good dispersion of GT in epoxy resin makes it fill the pores and holes left by epoxy resin curing and strengthen the corrosion resistance. The easy availability and green properties of glycine provide a simple and environmentally friendly method for the modification of Ti3C2Tx.
研究领域:
材料科学
·
电化学
·
表面工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Fangzheng Xi,Yunfa Si,Zibo Chen,Shaowen Cao,Geng Wu,Peng Li,Bo Liu,Cheng Chen,Daping He
Ti3C2Tx MXene’s industrial adoption is hindered by its instability in humid environments and poor dispersion in nonpolar processing solvents, while conventional surface functionalization strategies severely degrade its high electrical conductivity. Herein, we address this challenge through a ligand engineering strategy using phosphate-grafted organic ligands with tailored chain lengths. Among these, phenylphosphonic acid (PhPA) is identified as the optimal ligand, enabling stable dispersion of Ti3C2Tx in 13 organic solvents (spanning from polar to nonpolar) while retaining 47.8% of pristine conductivity (14.38 × 104 S m–1), which is a significant improvement over existing methods. The PhPA-modified Ti3C2Tx exhibits exceptional environmental stability, maintaining 93% of its electromagnetic interference shielding efficiency after 180 days in humid air and showing resistance to degradation in strong alkali, seawater, and thermal exposure up to 200 °C. Mechanistic studies reveal that minimal interlayer expansion reduces electron hopping barriers and interfacial resistance, while π-electron interactions between benzene rings and the Ti–O–P covalent network create electron highways that enhance charge transfer and suppress oxidation. This work provides a rational ligand design principle to optimize MXene stability and conductivity in organic solvents, thereby advancing their applications in energy storage and electronics.
研究领域:
材料科学
·
纳米技术
·
电子工程
✓ 已验证
DOI
高影响因子
ACS Nano
·
2019
·
IF 13.903
Xifan Chen,Yuanzhi Zhu,Miao Zhang,Jinyi Sui,Wenchao Peng,Yang Li,GuoLiang Zhang,Fengbao Zhang,Xiaobin Fan
MXenes, a family of two-dimensional (2D) transition-metal carbide and nitride materials, are supposed to be promising pseudocapacitive materials because of their high electronic conductivity and hydrophilic surfaces. MXenes, prepared by removing the “A” elements of their corresponding MAX phases by hydrofluoric acid (HF) or LiF–HCl etching, possess abundant terminal groups like −F, −OH, and −O groups. It has been proven that the MXenes with fewer −F terminal groups and more −O groups showed a higher pseudocapacitor performance. In organic reactions, −OH and −X (X = halogen) groups could turn to ether groups in strong nucleophilic reagent. Inspired by that, herein, we report an n-butyllithium-treated method to turn the −F and −OH terminal groups to −O groups on the Ti3C2Tx MXenes. Two types of Ti3C2Tx MXenes prepared by either HF or LiF–HCl etching were systematically investigated, and a comparison with the traditional KOH/NaOH/LiOH-treated method was also carried out. It is found that most of the −F terminal groups on the Ti3C2Tx MXenes can be successfully removed by n-butyllithium, and abundant −O terminal groups were formed. The n-butyllithium-treated Ti3C2Tx MXenes show promising applications in high-performance pseudocapacitors. A record high capacitance of 523 F g–1 at 2 mV s–1 was obtained for the n-butyllithium-treated Ti3C2Tx MXenes, and 96% capacity can remain even after 10 000 cycles.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Junzhi Li,Yanan Li,Haiyu Luo,Lili Tang,Nan Xu,Wenlan Ji,Shihao Zhang,Pei Nian,Yibin Wei
Construction of well-confined sub-nanochannels for molecular-sieving in organic solvent environment remains a challenge for organic solvent nanofiltration (OSN) membranes in precise fluid separation. Herein, cyclodextrin (CD) cross-linked 2D Ti 3 C 2 T x MXene membranes with laminar nanostructure containing unique sub-nanoscale mass transfer channels for unprecedented OSN performance is reported. Density-functional theory (DFT) calculation and experimental results confirm that CD monomers (α-, β-, γ-) with 3D intrinsic cavity structures are anchored with Ti 3 C 2 T x MXene nanosheets forming a stable polyester cross-linking network via an interfacial molecular engineering using trimesoyl chloride (TMC). The prepared membranes exhibit ultrahigh OSN performance with excellent stability in organic solvents. The optimal membrane can effectively reject dyes such as methylene blue (99.8%), rhodamine B (98.0%), and Congo Red (100%), while having high ethanol permeability ranging from 22.58 to 85.31 L/(m 2 h bar). Remarkably, the membrane structure remained intact after 4 weeks immersion in ethanol and acetone. This work provides a facile and reliable strategy to construct a high-performance 2D material-based OSN membrane with well-confined mass transfer channels.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2020
·
IF 14.588
Zixing Wang,Zhong Xu,Haichao Huang,Xiang Chu,Yanting Xie,Da Xiong,Cheng Yan,Haibo Zhao,Haitao Zhang,Weiqing Yang
Rich chemistry and surface functionalization provide MXenes enhanced electrochemical activity yet severely exacerbate their self-discharge behavior in supercapacitors. However, this self-discharge behavior and its related mechanism are still remaining issues. Herein, we propose a chemically interface-tailored regulation strategy to successfully unravel and efficiently alleviate the self-discharge behavior of Ti3C2Tx MXene-based supercapacitors. As a result, Ti3C2Tx MXenes with fewer F elements (∼0.65 atom %) show a positive self-discharge rate decline of ∼20% in comparison with MXenes with higher F elements (∼8.09 atom %). Such decline of the F elements can highly increase tight-bonding ions corresponding to an individual self-discharge process, naturally resulting in a dramatic 50% increase of the transition potential (VT). Therefore, the mixed self-discharge rate from both tight-bonding (contain fewer F elements) and loose-bonding ions (contain more F elements) is accordingly lowered. Through chemically interface-tailored engineering, the significantly changed average oxidation state and local coordination information on MXene affected the interaction of ion counterparts, which was evidently revealed by X-ray absorption fine structures. Theoretically, this greatly improved self-discharge performance was proven to be from higher adsorption energy between the interface of the electrode and the electrolyte by density functional theory. Therefore, this chemically interface-tailored regulation strategy can guide the design of high-performance MXene-based supercapacitors with low self-discharge behavior and will promote its wider commercial applications.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Xiaoying Yu,Tianfang Zheng,Yuanlin Li,Yanxiang Liu,Ping Guo,Hai-Hua Wang,Shin-ichi Sasaki,Xiao-Feng Wang
The production of hydrogen fuel by solar-driven photocatalytic water splitting is an attractive solution to overcome the environmental and energy problems with traditional fossil fuels. The strategies to improve the capacity of photocatalytic hydrogen production include enhancing the light absorption of materials and using co-catalysts to reduce the efficiency of electron–hole recombination. Here, we report a Schottky heterojunction photocatalyst composed of subphthalocyanine (SubPc) and Ti3C2Tx MXene, which can effectively separate photogenerated charges. The outstanding ability of SubPc to absorb visible light and the ability of Ti3C2Tx MXene to capture photogenerated electrons were applied to improve the photocatalytic hydrogen-production performance of the SubPc/Ti3C2Tx composite. Two types of SubPcs (SubPc-Cl and SubPc-OPh) were hybridized with Ti3C2Tx MXene nanosheets. The hydrogen evolution of SubPc/Ti3C2Tx with different mass ratios was experimentally investigated, and it was found that the optimized SubPc-Cl/Ti3C2Tx exhibited the best H2-production rate of 105 μmol g−1 h−1. Our findings provide a new design approach and promising strategy to develop low-cost photocatalysts for future solar-driven sustainable energy-conversion systems.
研究领域:
材料科学
·
能源转换
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2022
·Vol. 5
·期 3
·2369-2377
·
IF 11.806
Wang Zhipeng,Yin Kuan,Zhang Yuliang,Sun Kai,Xie Longjie,Cong Mengyang,Cao Shengjia,Lei Yanhua,Li Xiaofeng,Fan Runhua
In recent years, random composites with negative permittivity have been widely concerned owing to their unique properties and broad application prospects. In this paper, Ti 3 C 2 T x /carbonized wood (CW) composites with weakly negative permittivity were prepared by using CW as matrix and two-dimensional layered Ti 3 C 2 T x as the functional filler. The results of dielectric properties indicated that when the content of Ti 3 C 2 T x was 42.5 wt%, three-dimensional conductive networks were formed universally on the surface and inside the CW matrix. Meanwhile, the conduction mechanism changed from jumping conduction to metal-like conduction. Besides, the permittivity values of Ti 3 C 2 T x /CW composites changed from positive to negative and significantly reduced to the range of −65 to −35. This unique phenomenon was owing to the total electron concentration in the Ti 3 C 2 T x /CW composite being diluted equivalently, resulting in the decrease of plasma frequency, thus showing a weakly negative permittivity. This work provides a new strategy to determine the suitable content of conductive filler using percolation theory. Furthermore, the original fantastic structure properties of Ti 3 C 2 T x and wood also opened a new way for designing metacomposites, which has very important research value and far-reaching research significance. Graphical abstract Weakly negative permittivity achieved in two-dimensional Ti 3 C 2 T x /carbonized wood metacomposites.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Peng Wu,Yi Li,Song Xiao,Dachang Chen,Junyi Chen,Ju Tang,Xiaoxing Zhang
Ti3C2Tx MXene is an emerging two-dimensional transition-metal carbide/nitride with excellent properties of large specific surface and high carrier mobility for room-temperature gas sensing. However, achieving high sensitivity and long-term stability of pristine Ti3C2Tx-based gas sensors remains challenging. SnO2 is a typical semiconductor metal oxide with high reaction activity and stable chemical properties ideal for a dopant that can comprehensively improve sensing performance. Ti3C2Tx and SnO2 are investigated for the first time in this study as functional materials for hybridization and room-temperature detection of the gas insulating medium fluorinated nitrile (C4F7N) with microtoxicity. A Ti3C2Tx–SnO2 nanocomposite sensor exhibits superior sensitivity, high selectivity, strong anti-interference ability, and excellent long-term stability. The enhanced sensing mechanism is ascribed to the synergistic effect between SnO2 and Ti3C2Tx and the strong adsorption ability of SnO2 to C4F7N similar to bait for fish. We also established an actual leakage scene and demonstrated the feasibility of the Ti3C2Tx–SnO2 sensor to provide distribution rules with high sensing efficiency for actual engineering applications. The results of this work can expand the gas sensing application of Ti3C2Tx MXene and provide a reference for maintaining C4F7N-based eco-friendly gas-insulated equipment.
研究领域:
材料科学
·
气体传感技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Kai Wang,Zhenying Liu,Shouwu Huang,Jiayi Song,Shaofeng Dong,Tingting Pan,Qiaoyuan Wang,Yin Liu
Ni 0.2 Mn 0.4 Zn 0.4 Fe 2 O 4 (NMZF) nanoparticles were anchored on the surface of MXene(Ti 3 C 2 T x ) to form Ti 3 C 2 T x /NMZF nanocomposites for optimization of microwave absorption performance. The Ti 3 C 2 T x /NMZF nanocomposites were synthesized by using a four-step strategy, including sonication, stirring, hydrothermal reduction and vacuum drying. More than 40 percent of the NMZF nanoparticles in this nanocomposite were assembled to form a conductive network. Meanwhile, the multilayer MXene acted as a framework to host the NMZF nanoparticles, providing dipolar polarization, interfacial polarization and eddy current loss. Benefiting from the structure design of MXene, combined with magnetic materials and optimized impedance matching, the Ti 3 C 2 T x /NMZF exhibited a minimum reflection loss (RL min ) of −57.39 dB, with a thickness of 2.97 mm and an effective absorption bandwidth (EAB) of 3.2 GHz. Therefore, such a facile method could be used to construct nanocomposites with microwave absorption performance (-57.39 dB, 3.2 GHz), so as to address microwave pollution issues.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Environmental Science-Nano
·
2021
·Vol. 8
·期 5
·1446-1455
·
IF 8.131
Rumeng Zhang,Chao Li,Wei Liu,Yingping Huang,Bo Wang,Kemeng Xiao,Po Keung Wong,Liqun Ye
As an efficient green water disinfection technology, photothermal synergy sterilization has been paid more attention in recent years with its immeasurable advantages. The development of photocatalysts for efficient sterilization is currently an urgent need. In this manuscript, pure Ti3C2Tx is first studied as a photothermal synergy sterilization material and shows an excellent sterilization effect. The sterilization rate of Escherichia coli (E. coli) reaches 99.9% under visible infrared (vis-IR) light for 40 minutes. The peeling of the Al layer from Ti3AlC2 is the fundamental reason for improving the photothermal conversion ability, and photogenerated free radicals have also proved to be improved. The dilution spreading plate method, enzyme activity test, and leakage of cell contents confirmed the complete death of bacteria. Two aspects, photogenerated free radicals and photothermal synergy, were carried to illuminate the mechanism.
研究领域:
环境科学
·
材料科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
Small Science
·
2022
·Vol. 2
·期 7
·2200018
·
IF 0
Yajun Zhang,Long Pan,Peigen Zhang,ZhengMing Sun
High-performance electromagnetic (EM) absorbing materials are in urgent need due to severe EM pollution caused by fast development of communication technology and electronic devices. Gradient structure benefits EM absorbing performance. However, the relevant study is very limited, and the relationship between component layers and overall performance is unclear. Herein, a gradient structure containing impedance matching layer, lossy layer, and reflective layer is built via repeated casting-drying method using Ti 3 C 2 T x MXene and polyvinyl alcohol. With optimized gradient structure, the minimum reflection loss (RL) reaches −74.8 dB with effective absorbing bandwidth (EAB) covering the whole X-band. The good absorbing performance is ascribed to the good impedance matching, which is derived from the stepwisely increased permittivity of each layer. Moreover, it is found that RL reaches the lowest value when lossy layer permittivity is close to the average permittivity of impedance matching layer and reflective layer. In addition, the decrease of lossy layer permittivity causes the decrease of total thickness of the gradient structure. This work demonstrates the effectiveness of gradient structure toward strong and broadband microwave absorption and provides rules for designing proper gradient structures to satisfy different requirements.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Junmei Liang,Qicheng Zhang,Haibo Zhao,Shaolei Zhao,Yulong Wu,Xiaobin Fan
Hydrodeoxygenation (HDO) of fatty acids to alkanes is key to convert renewable resources into biofuels. Here, we design a new Ti3C2Tx MXene-confined Ni catalyst with extraordinary catalytic performance in the HDO of palmitic acid. Due to the large two-dimensional surface and chemical activity, Ti3C2Tx MXene is able to disperse and anchor Ni particles through strong synergistic coupling. As a consequence, the obtained Ni/Ti3C2Tx catalyst exhibits excellent catalytic performance with a complete conversion of palmitic acid. It can be recycled in five runs without activity reduction, demonstrating good stability of the as-prepared catalyst. The facilitated catalytic performance can be ascribed to the synergic effect of metal Ni and Ti3C2Tx MXene. Ti3C2Tx MXene facilitates the adsorption and conversion of palmitic acid to aldehyde. The dispersed Ni particles benefit from the hydrogenation of hexadecanal intermediate with the cleavage of C–C bonds and the dehydration–hydrogenation of hexadecanol to form alkanes.
研究领域:
催化化学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）