ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Rui Zhou,Bo Tu,Dacheng Xia,Hanping He,Zhiwei Cai,Nan Gao,Gang Chang,Yunbin He
Accurate measurement of dopamine (DA) is of great significance for human health monitoring and disease prevention. Herein, two-dimensional Ti 3 C 2 T x MXene with high performance was prepared by layer liquid exfoliation method and used for the modification of gate electrode. The glassy carbon electrode (GCE) modified with Pt/Ti 3 C 2 T x was used as the gate, and assembled with monolayer graphene channel to form a complete transistor device. The device combines the amplification effect of transistors, good electrical conductivity of Ti 3 C 2 T x MXene and excellent catalytic properties of Pt nanoparticles , showing a low detection limit (50 nM) and a wide detection concentration range (50 nM-9 mM) of DA. Ti 3 C 2 T x MXene not only provides a large number of attachment sites for the deposition of Pt nanoparticles , but also improves the electrical conductivity and hydrophilicity of the electrode material , thus enhancing the sensitivity of the device and facilitating the penetration of the solution to be measured. In addition, Ti 3 C 2 T x MXene is negatively charged, it has a certain electrostatic adsorption effect on protonated DA and electrostatic repulsion effect on negatively charged interfering substances. As a result, the device exhibits good selectivity , which provides a great application prospect for the construction of DA sensing platform.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Daoyuan Zu,Haoran Song,Changping Li,Yuwei Wang,Rong Du,Rui Zhou,Wei Zhang,Shiting Pan,Yang Cai,Yongming Shen,Zhifeng Yang
Self-catalyzed decomplexation of Cu-ethylene diamine tetraacetic acid complex (Cu-EDTA) and recovery of Cu without addition of extraneous transition metals were achieved in Ti 3 C 2 T x MXene/peroxymonosulfate (Ti 3 C 2 T x /PMS) process. Free radical quenching experiments and electron spin resonance (ESR) measurements demonstrated that both hydroxyl radical (HO • ) and sulfate radical (SO 4 •- ) contributed to the degradation of Cu-EDTA. Activation of PMS by Ti 3 C 2 T x initiated Cu-EDTA decomplexation and released free Cu ions . Then, the formation of Ti-O-Cu bonds between Cu ions and Ti 3 C 2 T x accelerated the electron transfer from Ti 3 C 2 T x to Cu(Ⅱ) and triggered Cu(Ⅱ)/Cu(Ⅰ) cycle, which further enhanced PMS activation and led to the self-catalyzed decomplexation of Cu-EDTA. Simultaneous recovery of Cu was achieved due to the excellent absorption performance of negative charged Ti 3 C 2 T x towards Cu ions. This study revealed the self-catalyzed decomplexation mechanism of Cu-EDTA in the Ti 3 C 2 T x /PMS process and provided a feasible strategy for heavy metal complexes treatment.
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CARBON
·
2023
·
IF 10.9
Hanqi Qian,Wenhong Jiang,Xiangrong shi,Qingyuan Cao,Bo Jiang,Yudong Huang
Aerogel materials have shown tremendous vistas in electromagnetic interference (EMI) of intelligentized electronics and armaments. However, it is challenging to simultaneously achieve self-enhanced shielding performance and release the accumulation thermal. Herein, an intelligent tunable shielding composite was demonstrated through synergistic dynamic interactions between Ti 3 C 2 T x and tungsten doped VO 2 (WVO 2 ), tactfully transforming the accumulation thermal energy to superiority for enhanced shielding. Additionally, the performances of meticulously engineered Ti 3 C 2 T x -WVO 2 composite from thermal conversion to enhanced electromagnetic shielding have been hierarchically dissected. The composite possessed highly sensitive and dynamically tunable shielding performance (Δ SE = 13.9 dB, X-band = 8–12 GHz) and high-efficiency thermal management characteristic by virtue of three-dimensional porous Ti 3 C 2 T x skeleton, the phase transition of WVO 2 and energy transformation between Ti 3 C 2 T x and WVO 2 . Furthermore, the composite provides excellent shielding performance (EMI SE = 42.8 dB). Therefore, this Ti 3 C 2 T x -WVO 2 composite can be a potential candidate in both EMI shielding and tunable shielding fields.
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Nanomaterials
·
2021
·Vol. 11
·期 12
·3174
·
IF 5.076
Beibei Yang,Tian Qin,Ziping Bao,Wenqian Lu,Jiayu Dong,Duan Bin,Hongbin Lu
It is well-known that platinum (Pt) is still the preferred material of anode catalyst in ethanol oxidation, however, the prohibitive high cost and CO poisoning of Pt metal impede the commercialization of fuel cells. Therefore, improving the utilization rate of catalysts and reduce the cost of catalyst become one of the most concerned focus in the construction of fuel cells. In this work, the Pt-based catalysts are synthesized by using different content of sodium dodecyl sulfate (SDS) modified-Ti3C2Txsupport, and the dispersion regulation function of SDS modified-Ti3C2Txsupported on Pt nanoparticles is investigated. The structure, composition and morphology of different catalysts are characterized by X-ray diffraction (XRD), X-ray spectroscopy (EDX), transmission electron microscopy (TEM) and high-resolution TEM, respectively. It is found that the Pt nanoparticles in pure Ti3C2Txsurface are serious aggregated and show poor dispersion, whereas the Pt nanoparticles in SDS modified-Ti3C2Txhave a better dispersion. The electrochemical results revealed that SDS modified-Ti3C2Txsupported Pt nanoparticles has higher electrocatalytic activity and stability in both acidic and alkaline ethanol oxidation when the dosage of SDS increases to 100 mg. These findings indicate that the SDS-Ti3C2Tx/Pt catalysts show a promising future of potential applications in fuel cells with modification of Ti3C2Txsupport.Keywords:ethanol oxidation;sodium dodecyl sulfate (SDS) modified-Ti3C2Tx;Pt nanoparticles;dispersion;electrocatalytic activity
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高影响因子
DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Xuteng Xing,Yating Sui,Xiaoyang Xu,Dan Zhou,Qiushi Li,Yuelong Xu,Erjun Tang,Shaojie Liu
The Ti 3 C 2 T x MXene is a new class of two-dimensional inorganic material, which can be used as anticorrosive filler for epoxy coating . In this work, the BTA molecules are intercalated into Ti 3 C 2 T x MXene through hydrogen bonding to obtain a high-performance active-passive dual protective function Ti 3 C 2 T x MXene@BTA composite corrosion inhibitor . The morphology, structure and composition of prepared Ti 3 C 2 T x MXene@BTA nanocomposite were studied by scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectrometer (XPS). Moreover, the release behavior and inhibition behavior were investigated by UV–vis spectrophotometer and electrochemical impedance spectroscopy (EIS), respectively. The results show that the continuously released of BTA can be achieved by introducing BTA into Ti 3 C 2 T x MXene interlayer , and the complete release time can reach 1000 min. In addition, EIS results show that the Ti 3 C 2 T x MXene@BTA composite coating exhibited the excellent anti-corrosion properties, and the impedance value remains above 10 10 Ω·cm 2 for 50 days in 3.5 NaCl solution, which is 4 orders of magnitude higher than that of pure epoxy coating.
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高影响因子
CEMENT & CONCRETE COMPOSITES
·
2023
·
IF 10.5
Zhichao Xu,Huayang Sun,Yanlin Huo,Minjie Jia,Zhitao Chen,Yingzi Yang
MXene is a new two-dimensional transition metal carbide/nitride with remarkable hydrophilicity , which has been widely applied in multifunctional coatings . In this study, Ti 3 C 2 T x MXene was synthesized by LiF/HCl solution etching of Ti 3 AlC 2 and used to modify the surface of polyethylene (PE) fiber, enhancing the interfacial properties between fiber and matrix and further improving the tensile properties of strain hardening cementitious composites (SHCC). The tensile stress and strain of SHCC incorporating the MXene-coated PE (MXene@PE) fiber increased by 18.73 % and 93.60 %, respectively, accompanied by reduced crack width and crack spacing. Single fiber pullout results showed that the frictional bond strength increased by 71.35 % due to the strong chemical bond between fiber and matrix. The microstructure of MXene@PE fiber and bonding properties were characterized by SEM/EDS, FTIR, and XPS. The MXene was proved to have a dual effect of bonding to PE fiber and to C–S–H via covalent and hydrogen bonds .
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RSC Advances
·
2023
·Vol. 13
·期 49
·34808-34816
·
IF 3.9
Zishan Hu,Yuanlin Li,Aijun Li,Hai-Hua Wang,Xiao-Feng Wang
Establishing stable and efficient Pt-free counter electrodes (CEs) is an important challenge for dye-sensitized solar cells (DSSCs). Ti3C2Tx MXene, with its high catalytic activity and conductivity, has gained attention as a CE in DSSCs. The focus of this paper is on the preparation of Ti3C2Tx decorated carbon nanotubes (CNTs) composite electrode materials (CNTs/Ti3C2Tx), and testing their performance as CEs in DSSCs. Through a series of electrochemical tests, a CNTs/Ti3C2Tx CE exhibits good electrocatalytic activity toward iodine-based electrolytes with low charge transfer resistance, which is close to the performance of a Pt CE. The photoelectric conversion efficiency (PCE) of the CNTs/Ti3C2Tx (1.0 wt%) CE-based DSSCs reaches 5.83%, which is much higher than that of the CNTs CE (3.70%), and approximates that of the Pt CE (6.61%). We attribute the improved performance to the synergistic effect of the excellent conductivity and unique two-dimensional chemical structure of Ti3C2Tx MXene. Moreover, the photostability test of continuous light exposure shows that the CNTs/Ti3C2Tx-1.0 wt% (C/T-1.0 wt%) CE exhibits good stability to the electrolyte. Therefore, CNTs/Ti3C2Tx composites can be used as an efficient Pt-free CE for DSSCs in the future.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Yi Zhao,Shuang Wang,Zhiheng Zhang,Yidong Hu,Kai Ge,Binyuan Liu,Yongfang Yang
Metal-organic framework (MOF) layers were grown in situ from 2D transition metal carbides (MXenes, Ti 3 C 2 T x ) at room temperature to obtain the two-dimensional (2D) Ti 3 C 2 T x @MOF heterostructures with a tightly connected interface. This interface provided more titanium atoms in the low-valence state in comparison to the original Ti 3 C 2 T x , thus facilitating more electron transfer from Ti 3 C 2 T x to MOF-(Fe/Co) nanosheets . The charge density difference and density functional theory results disclosed that Ti 3 C 2 T x could modulate the electronic density around the active sites and lower ΔG H * energy barrier of 2D MOF-(Fe/Co) nanosheets towards the improved hydrogen evolution reaction (HER) activity. The obtained 2D Ti 3 C 2 T x @MOF heterostructures exhibited a much higher HER activity in 1 M KOH electrolyte (with the overpotential of 104 mV at 10 mA/cm 2 and Tafel slope of 79 mV/dec) than those of 2D Ti 3 C 2 T x @MOF-TH, 2D MOF nanosheets , and Ti 3 C 2 T x nanosheets. This research provides a basis for developing superior 2D MOFs, which can enhance HER properties through efficient electronic transport at the heterojunction interface.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Guoyu Yang,Xuming Yao,Yujun Li,Yi Hu,Xing Chen,Jialiang Li,Junzhen Chen,Jianjun Jiang
Owing to its excellent electronic properties, Ti3C2Tx MXene is an emerging class of two-dimensional nanomaterials that have a promising electromagnetic (EM) wave function; however, poor impedance matching has limited the application of these materials in absorption-dominated EM interference (EMI) shielding. Hence, the investigation of thin MXene nanosheet-based film materials for application to absorption-dominated EMI shielding, which produces less EM pollution than reflection-dominated EMI shielding materials, is essential. In this study, a Ti3C2Tx/carbonyl iron–aramid hybrid film possessing absorption-dominated EMI shielding properties was prepared by using flower-like core–shell Ti3C2Tx/carbonyl iron microspheres (Ti3C2Tx/CIs) and aramid nanofibers. In the X band, the EMI shielding effectiveness of the films reached 31.9 dB with a lower SER value (below 3 dB), which means that less than 50% of the reflected incident waves and secondary EM pollution were reduced by the EMI shielding film materials. These results were attributed to superior impedance matching and multiple dissipation mechanisms of the Ti3C2Tx/CIs nanocomposites, which substantially enhanced the EM-wave absorption properties of a single MXene. The experimental results indicated that Ti3C2Tx/CIs nanocomposites showed a minimum reflection loss of −50.8 dB at 7.84 GHz. Moreover, a maximum effective absorption bandwidth of 5.5 GHz (12.48–18 GHz) was obtained at 1.60 mm, almost covering the entire Ku band. Therefore, this work provides a framework for designing MXene-based absorption-dominated EMI shielding nanocomposites.
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2021
·Vol. 147
·期 3
·2239-2251
·
IF 4.626
Zhao Qian,Wang Bowen,Qin Chenyuan,Li Qiuxuan,Liu Chuntai,Shen Changyu,Wang Yaming
In this work, biodegradable poly(lactic acid) (PLA)/Ti 3 C 2 T x MXene nanocomposites were prepared through melt compounding. The roles of MXene in nonisothermal melt and cold crystallization of PLA were explored. The morphology, structure and crystallization behavior were studied using polarized optical microscopy, wide-angle X-ray diffraction and differential scanning calorimetry. For nonisothermal melt crystallization, the presence of MXene increases the crystallinity and shortens the half-crystallization time but does not change the crystallization peak temperature of PLA. For nonisothermal crystallization from the glassy state, the incorporation of MXene decreases the cold crystallization peak temperature and reduces the crystallinity marginally but does not affect the half-crystallization time of PLA. The crystallization kinetics analysis based on the Avrami equation shows that, for both the melt and cold crystallization, the crystallization mechanism is unchanged irrespective of the addition of MXene. The investigation would be useful for understanding the correlation between processing and properties of PLA/MXene nanocomposites.
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CARBON
·
2021
·
IF 9.594
Biao Ji,Shangwu Fan,Sijie Kou,Xiaoyu Xia,Juanli Deng,Laifei Cheng,Litong Zhang
Ti 3 C 2 T X MXene has been proven to be a material of high application potential in the field of electromagnetic (EM) protection. Considering the density, MXene/polymer films (MPFs) are fabricated by employing the simple tape casting process and exhibit excellent electromagnetic shielding performance with respect to the MXene content. However, the absorption properties of as-fabricated MPFs are not satisfactory due to the impedance mismatch. Herein, a multilayer impedance gradient absorber with MPFs arranged in order has been successfully designed and prepared. The developed absorber possesses excellent EM wave absorption properties owing to the well-matched impedance and adjustment of permittivity. Moreover, the effect of the thickness of MPFs on the EM wave absorbing properties has been investigated by theoretical calculations and experimental measurements. The HFSS calculation reveals that the effective absorption bandwidth is capable to cover the whole X-band (8.2–12.4 GHz) with only a micro-adjustment of the thickness, with the minimum reflection coefficient (RC min) reaching up to −26.10 dB. In addition, the synergistic effect of the multiple loss mechanisms has been discussed in detail. This study not only proposes the effective design of a novel multilayer impedance gradient absorber, but also provides new fundamental basis for combining the simulation technology and material design.
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高影响因子
TEXTILE RESEARCH JOURNAL
·
2021
·
IF 1.82
Hengyu Zhang,Jianying Chen,Hui Ji,Ni Wang,Shuo Feng,Hong Xiao
Electromagnetic interference (EMI)-shielding materials with remarkable shielding effectiveness (SE) based on dominant absorption are highly desirable, especially if they are also flexible and lightweight. Herein, we prepared MXene (Ti3C2TX, TX-=O,-OH,-F)-based lightweight and absorption-dominant EMI-shielding non-woven fabrics. In view of the porosity and soft properties of textiles, as well as the unique high conductivity and hydrophilicity of Ti3C2TX MXene, Ti3C2TX MXene was coated on the fiber skeleton of three different non-woven fabrics made from polyester, cotton, and calcium alginate. The conductive layer formed by Ti3C2TX MXene on the fiber led to heterogeneous interfaces. They improved the multiple reflection of electromagnetic waves among Ti3C2TX MXene sheets and then contributed to the attenuation of the electromagnetic waves. Among all the samples, calcium alginate/Ti3C2TX MXene reached a maximum SE of 25.26 dB at 12.4 GHz with the fabric thickness of 3.17 mm. Cotton/Ti3C2TX MXene achieved maximum SSEt (ratio of specific shielding effectiveness (SSE) to thickness) of 2301.95 dB cm2g−1 at 1.36 mm with a loading of Ti3C2TX MXene of only 5.77mg/cm3. Further, fabric thickness, layer number, conductivity, and substrate type were selected to analyze the EMI-shielding mechanism.
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