POLYMER COMPOSITES
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2021
·Vol. 43
·期 1
·84-93
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IF 3.171
Jiaming Guo,Tingtian Qiu,Chengxingzi Yu,Yu Liu,Chen Ning,Lingqiang Kong,Yan Ma,Liu Liu,Yuhui Ao
An unprecedented electrostatic self-assembly of MXene and SiO 2 on carbon fiber (CF) to enhance the interfacial properties of CF-reinforced epoxy resin composites is disclosed. MXene with negative charge was anchored on the cationized CF surface via a strong electrostatic interaction, followed by synergistic effect of amine-modified SiO 2 (positive charge) to furnish a stable MXene/SiO 2 material with three-dimensional structure, which takes the advantages of high modulus, large specific surface area, and high-surface activity. The involvement of the two nano-materials with different dimensions and morphologies results in synergistic enhancement on mechanical interlocking, leading to excellent chemical bonding connection between CF and resin, which could transfer stress and dissipate energy effectively. Moreover, the surface energy of CF increased from 26.67 to 48.12 mJ/m 2 after assembly of MXene/SiO 2 . Compared with unsized CF/EP composites, the interfacial shear strength, interlaminar shear strength, and flexural strength of CF/MXene/SiO 2 /epoxy (EP) composites were increased by 73.2%, 61.2%, and 39.2%, respectively. Dynamic mechanical analysis poxy (DMA) tests showed that the storage modulus of the CF/MXene/SiO 2 /EP composites was enhanced by 64% compared with CF/EP composites, and the glass-transition temperature of composites was elevated from 147.9 to 151.8°C. This protocol provides a promising strategy for designing advanced CF/EP composites with three-dimensional structure.
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JOURNAL OF MEMBRANE SCIENCE
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2021
·
IF 8.742
Tao Zhang,Li-Zhi Zhang
Membrane-based air humidification-dehumidification desalination (MHDD) is an emerging seawater desalination process that can be driven by low-grade, renewable energy sources; however, membrane fouling and wetting are key issues that hinder its practical application. In this study, a composite membrane using a hydrophobized MXene deposited on a polyvinylidene fluoride (PVDF) support layer was fabricated to improve membrane anti-fouling ability in seawater desalination without sacrificing permeability. The MXene-P (1H,1H,2H,2H-heptadecafluorodecyltrimethoxysilane-modified MXene) membrane exhibited optimal desalination performance, maintaining a water permeation flux of 1.88 kg m −2 h −1 , and a salt rejection of nearly 100%. Its permeability was close to that of a pure PVDF porous membrane (1.95 kg m −2 h −1 ). A plausible explanation is that the porous MXene layer, enlarged interlayer spacing, and gaps created by the stacking of sheets provide multiple water transport channels, and the ultra-thin coating thickness minimizes the additional mass transfer resistance. Moreover, it was found that the performance of the MXene-P membrane remained stable within 120 h under actual seawater conditions, and no obvious contamination of the membrane surface was observed after this testing, which was attributed to the large water contact angle (150°) and high negative charge (−70 mV) of the coated layer. The maintenance of both long-term operational stability and high moisture permeability, with outstanding salt rejection, are essential for real seawater desalination driven by solar energy.
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JOURNAL OF HAZARDOUS MATERIALS
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2021
·
IF 10.588
Guang Yang,Xin Hu,Jie Liang,Qiang Huang,Jibo Dou,Jianwen Tian,Fengjie Deng,Meiying Liu,Xiaoyong Zhang,Yen Wei
In this work, a novel imidazoles-MXene hybrid composite, namely polyimidazoles chain overlaying on the surface of MXene (Ti 3 C 2 @IMIZ), was prepared by a simple method. Through this strategy, imidazoles can be in situ growth on the surface of MXenes via a facile multicomponent reaction using chitosan as a renewable reactant. Based on the characterization results, we demonstrated that a thin layer imidazoles with an ordered chain structure was embedded on the surface of Ti 3 C 2 , which resulted in the formation of a novel imidazoles-MXene hybrid composite. The adsorption performance of Ti 3 C 2 @IMIZ for removal environmental pollutants was evaluated using heavy metal ions of Cr(Ⅵ) as adsorbate. Detailed adsorption characteristics of Ti 3 C 2 @IMIZ including operational factors, adsorption kinetics and isotherms models were investigated. XPS analysis showed that Cr(VI) was converted to Cr(III) with low toxicity during the adsorption process . The adsorption of Cr(VI) and reduction of Cr(VI) to Cr(III) contribute to elimination of Cr(VI) species. The adsorption behavior and process analysis show that the adsorption mechanism is mainly physical adsorption through electrostatic interaction. The excellent reproducibility suggests that Ti 3 C 2 @IMIZ may be a potential candidate for remove of Cr(Ⅵ) in actual sewage treatment .
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CARBON
·
2021
·
IF 9.594
Mengyi Peng,Menglei Dong,Wei Wei,Huajie Xu,Chuntai Liu,Changyu Shen
The chemical conversion of the surface termination of 2D transition metal carbides/nitrides (MXenes) has opened up a design space that previously had not been extensively explored for this functional material . Herein, via a simple sealed thermal method, the amino terminated groups were successfully introduced on Ti 3 C 2 MXene surface. The substitution reaction of amino group to hydroxyl group was proposed to elucidate this aminated process. As the amination would reduce the carrier density on the surface of MXene, the electrical conductivity of MXene-NH 2 film decreased, while it still reached a high conductivity of 2.11 × 10 4 S m −1 . This film also possessed an excellent electromagnetic interference shielding effectiveness of 16160 dB cm 2 g −1 . Importantly, although the introduction of amino termination altered Zeta potential value, Zeta potential sign remained negative and the MXene-NH 2 exhibited excellent dispersity in water similar to that of traditional MXenes. Furthermore, the existence of covalent bonds endowed MXene-NH 2 polymer composite film with improved mechanical properties . Compared with that of traditional CMC/MXene film, the tensile strength and fracture energy of CMC/MXene-NH 2 increased by 65.5% and 132.7%, respectively. These results demonstrated that the introduction of amino terminated group on MXene surface would be an effective strategy to obtain higher performance MXene-based films.
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Nanomaterials
·
2021
·Vol. 11
·期 3
·720
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IF 5.076
Yunjia Wang,Jianwen Wang,Qiao Wen
Owing to their unique characteristics, two-dimensional (2-D) materials and their complexes have become very attractive in photoelectric applications. Two-dimensional heterojunctions, as novel 2-D complex materials, have drawn much attention in recent years. Herein, we propose a 2-D heterojunction composed of MXene (Ti2CTx) materials and graphene oxide (GO), and apply it to an Nd:YAG solid-state laser as a saturable absorber (SA) for passive Q-switching. Our results suggest that a nano-heterojunction between MXene and GO was achieved based on morphological characterization, and the advantages of a broadband response, higher stability in GO, and strong interaction with light waves in MXene could be combined. In the passively Q-switched laser study, the single-pulse energy was measured to be approximately 0.79 µJ when the pump power was 3.72 W, and the corresponding peak power was approximately 7.25 W. In addition, the generation of a stable ultrashort pulse down to 109 ns was demonstrated, which is the narrowest pulse among Q-switched solid-state lasers using a 2-D heterojunction SA. Our work indicates that the MXene–GO nano-heterojunction could operate as a promising SA for ultrafast systems with ultrahigh pulse energy and ultranarrow pulse duration. We believe that this work opens up a new approach to designing 2-D heterojunctions and provides insight into the formation of new 2-D materials with desirable photonic properties.Keywords:MXene;saturable absorber;heterojunction;Q-switched;pulsed laser;nonlinear optics;bulk laser
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Composites Part C: Open Access
·
2021
·
IF 0
Anthony Chun Yin Yuen,Timothy Bo Yuan Chen,Bo Lin,Wei Yang,Imrana I. Kabir,Ivan Miguel De Cachinho Cordeiro,Andrew E. Whitten,Jitendra Mata,Bin Yu,Hong-Dian Lu,Guan Heng Yeoh
MXene is a class of 2D materials exfoliated from ternary carbide and nitride ceramics. During synthesis, etching and delamination conditions affect the quality, overall crystallinity, defects and surface functionalization of MXene flakes. In this article, the morphological structure of MXene (Ti 3 C 2 ) nanosheets under temperature between 20 °C and 60 °C were investigated with the application of Small-Angle Neutron Scattering (SANS) combined with several complementary techniques, such as Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) and X-ray Photoelectron Spectroscopy (XPS). The SANS analysis enabled structural information to be obtained about the Ti 3 C 2 nanosheets, which consists of layers of transition metal carbides in a multilayer lamella morphology. The results showed that a single Ti 3 C 2 layer is approximately 11.4 – 11.8 Å (1.14 – 1.18 nm) in thickness with a 20.3 – 21.5 Å (2.03 – 2.15 nm) interstacking layer gaps. This results in a total thickness of approximately 32 Å (3.2 nm), which was consistent with the model-dependent lamella model analysis. Furthermore, the thickness of the Ti 3 C 2 layer increased by approximately ~2 Å (0.2 nm) when the temperature increased from 20 - 40 to 50 - 60 °C.
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SENSORS AND ACTUATORS B-CHEMICAL
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2020
·
IF 7.1
Xin Li,Yanli Lu,Zhenghan Shi,Guang Liu,Gang Xu,Zijian An,Huan Xing,Qingmei Chen,Ray P.S. Han,Qingjun Liu
Two-dimensional (2D) materials provides large surface area for H 2 O molecules adsorption and interaction, which has been utilized in humidity sensing and noninvasive monitoring of physiological events such as respiration. However, disadvantages including slow response or modest response hinder the accurate tracking of human breath. Hence, MXene , the new member of 2D material family with excellent hydrophilicity and tunable conductivity, has drawn much attention. In this work, the enhanced response of Ti 3 C 2 T x MXene to H 2 O molecules was achieved by onion-inspired assembling of Ti 3 C 2 T x MXene and chitosan-quercetin hybrid layer-by-layer. The chitosan-quercetin modified multilayers suppress the degradation of MXene in environment, exhibiting superior response (317 % at 90 % RH), ultrafast response (0.75 s), and long-term stability (more than 15 days). Integrated with a wireless flexible detecting tag, the multilayers realized wearable human respiration monitoring with robust, accurate tracking capacity, offering a facile and feasible method for versatile physiological monitoring based on humidity sensing.
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ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Krishnamoorthy Rajavel,Xuecheng Yu,Pengli Zhu,Yougen Hu,Rong Sun,Chingping Wong
Defect-controlled exfoliation of few-layer transition-metal carbide (f-Ti3C2Tx) MXene was demonstrated by optimizing chemical etching conditions, and electromagnetic interference (EMI) shielding coatings were explored. The structural features such as layer morphology, lateral size, layer thickness, defect density, and mechanical stability of the exfoliated f-Ti3C2Tx were strongly dependent on exfoliation conditions. By selecting appropriate exfoliation conditions, moderate etching time leads to the formation of quality f-Ti3C2Tx with lesser defects, whereas longer etching time can break the layer structure and increase defect density, structural misalignment, and oxidative products of f-Ti3C2Tx. The resultant fabricated free-standing flexible f-Ti3C2Tx films exhibited electrical conductivity and electromagnetic interference (EMI) shielding effectiveness (SE) in the X-band of about 3669 ± 33 S/m and 31.97 dB, respectively, at a thickness of 6 μm. The large discrepancy in EMI SE performance between quality (31.97 dB) and defected (3.164 dB) f-Ti3C2Tx sheets is attributed to interconnections between f-Ti3C2Tx nanolaminates interrupted by defects and oxidative products, influencing EMI attenuation ability. Furthermore, the demonstrated solution-processable high-quality f-Ti3C2Tx inks are compatible and, when applied for EM barrier coating on various substrates, including paper, cellulose fabric, and PTFE membranes, exhibited significant EMI shielding performance. Moreover, controlling defects in f-Ti3C2Tx and assembly of heterogeneous disordered carbon-loaded TiO2–Ti3C2Tx ternary hybrid nanostructures from f-Ti3C2Tx by tuning etching conditions could play an enormous role in energy and environmental applications.
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Advanced Materials Interfaces
·
2020
·Vol. 7
·期 19
·2000831
·
IF 4.948
Zhilin Zhao,Xinming Wu
Multifarious layered electrode materials are attracting increased attention in the field of energy storage because of their high specific surface and interlayer modifiability. However, the natural tendency to be re-superimposed and the inherent disadvantages of a single layered electrode significantly affect electronic transport and ion migration. Considering the poor electrochemical performance and low structural stability, a novel MXene@PDDA/NiAl-LDHs hybrids as supercapacitor electrode via an electrostatic-assembled approach is elaborately designed. The alternate MXene and PDDA/NiAl-LDHs layers with 3D interconnected networks architectures could ensure intimate contact to efficiently take advantage of high electron conductivity of MXene and high pseudocapacitance activity of PDDA/NiAl-LDHs, thus effectively accelerating the ionic/electronic transport rates and improving the electrochemical storage of hybrid electrodes. As a consequence, as an electrode for supercapacitor, the MXene@PDDA/NiAl-LDHs exhibits a high specific capacitance of 1825.8 F g −1 at a current density of 1.0 A g −1 , a remarkable synergetic effect, leading to a high rate capability after 100 cycles at different current densities and long cycling stability with only 0.9% degradation after 5000 cycles at 5.0 A g −1 . This work provides a strategy for 2D layered materials to design electrodes with excellent electrochemical performance in the field of energy storage.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
·
IF 16.683
Xitao Li,Xinding Lv,Xiangnan Sun,Chen Yang,Yan-Zhen Zheng,Lihui Yang,Siqi Li,Xia Tao
Abundant electrochemical active sites, high electronic conductivity as well as stable structure and electrochemical activity are indispensable but usually incompatible to the ideal electrocatalysts for hydrogen evolution reaction (HER). Herein, an efficient and stable MoS 2 -Ti 3 C 2 MXene electrocatalyst is synthesized using a delicately designed one-step hydrothermal method, in which the few-layers thick, edge-oriented, high-percentage 1T′-phase (∼ 85.0 %) MoS 2 nanosheets are well grown on the cation-modified Ti 3 C 2 MXene and stabilize Ti 3 C 2 MXene against spontaneous oxidation caused by dissolved-oxygen. The structure and phase engineering of MoS 2 as well as the fully surface-shielding Ti 3 C 2 MXene endow the as-synthesized MoS 2 -Ti 3 C 2 MXene electrocatalyst with a wealth of accessible active sites and high electrical conductivity for HER together with excellent structure stability. Consequently, the as-synthesized MoS 2 -Ti 3 C 2 MXene exhibits remarkable electrocatalytic HER performance in acidic medium with a low overpotential of 98 mV at 10 mA cm -2 , a depressed Tafel slope of 45 mV dec -1 and a low electrochemical resistance.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Weimin Chen,Daotong Zhang,Kai Yang,Min Luo,Pei Yang,Xiaoyan Zhou
Traditional porous carbon (PC)-based supercapacitors (SCs) are generally stiff and heavy owing to their rigid components and bulky additives, such as binders, conducting materials, and current collectors. Herein, a porous (574.5 m 2 g −1 ), conductive (83.1 S cm −1 ), and flexible MXene (Ti 3 C 2 T x )/cellulose nanofiber (CNF)/PC hybrid film is prepared by strong interfacial interactions among its components via a facile vacuum-filtration method. Three-dimensional PC provides abundant micropores for charge storage and considerable amount of meso/macropores for fast diffusion of ions. Two-dimensional Ti 3 C 2 T x offers a significantly high conductivity of 2.6 × 10 3 S cm −1 and a good film-forming ability. A one-dimensional CNF ensures high mechanical properties with a tensile strength of 38.6 MPa for the hybrid film by binding the adjacent Ti 3 C 2 T x flakes and PC. Additionally, the presence of CNF and PC increases the interlayer distance between Ti 3 C 2 T x flakes, thereby providing more ion-accessible surface areas on Ti 3 C 2 T x and creating open gaps for fast ion transport. Benefiting from these electrochemically attractive properties, this film is further employed as a free-standing electrode to fabricate a high-performance quasi-solid-state SC, which demonstrates an ultrathin thickness of 0.2 mm, a high flexibility, a significantly high areal capacitance of 143 mF cm −2 at 0.1 mA cm −2 , and a large areal energy density of 2.4 μWh cm −2 at 17.5 μW cm −2 , with a high retention of ~50% even after increasing the power density by ~100 fold. This work will pave the way for developing free-standing MXene-based hybrid films that simultaneously possess excellent conductivity, good mechanical properties, and large charge storage capacity for flexible and high-performance SCs.
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TALANTA
·
2020
·
IF 5.339
Yuhuan Wang,Zhixing Zeng,Jianyu Qiao,Shuqing Dong,Qing Liang,Shijun Shao
An ultrasensitive and high-performance electrochemical nitrite sensing platform based on gold nanoparticles deposited on poly (dimethyl diallyl ammonium chloride)-decorated MXene (Ti 3 C 2 T x ) (AuNPs/Ti 3 C 2 T x -PDDA) was constructed. AuNPs/Ti 3 C 2 T x -PDDA on the surface of electrode displayed synergetic catalytic effect for oxidizing NO 2 ‾ originating from especially catalytic activity of AuNPs, large area and excellent conductivity of Ti 3 C 2 T x , as well as electrostatic interaction of PDDA. The amperometry technique was employed for quantitative determination of nitrite, in which the AuNPs/Ti 3 C 2 T x -PDDA/GCE sensing platform showed outstanding linear relationship in 0.1–2490 μM and 2490–13490 μM for nitrite, meanwhile the detection limit of 0.059 μM. Besides, the prepared sensor possessed high sensitivity of 250 μA mM −1 cm −2 yet excellent selectivity, stability and reproducibility. Furthermore, this platform also exhibited satisfactory feasibility of nitrite sensing in running water and ham sausage sample. This work would broaden a facile approach to construct high sensitivity electrochemical sensing platform via two-dimension materials and its nanocomposites.
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危险品化学品经营许可证（带存储）