ACS Applied Nano Materials
·
2022
·
IF 6.14
Bao Shi,Lu Chen,Tien-Chien Jen,Xinying Liu,La Li,Aibing Chen,Guozhen Shen
Freestanding and flexible MXene electrodes have exhibited great potential in wearable energy device design through over 10 years of rapid development but are yet limited by the restacking of nanosheets and the complex and lengthy ion transport paths that reduce their performance at high charge–discharge rates. Herein, we provide a molten salt method assisted by a selective etching process for the directional vertical growth of Ti2CTx MXene nanosheets on carbon fiber (CF) substrates, showing several advantages: (1) bifunctional CF, which acts as both a self-supported freestanding flexible substrate and carbon source during the synthesis of the Ti2AlC MAX phase, (2) eliminating the need for collecting the powder Ti2CTx MXene from the acid mixture after the selective etching process and filtration steps to obtain freestanding and flexible MXene films, and (3) the directional vertical arrangement of Ti2CTx shortens the ion diffusion path and the integrated structure of nanosheets and carbon fibers speeds up ion transport. As a result, the fabricated Ti2CTx MXene@CF//Zn@Cu@CF hybrid Zn-ion supercapacitor delivers a high areal capacitance of 380 mF/cm2, an energy density of 52.77 μWh/cm2 at 5 mV/s, excellent stability with 90.06% capacity retention after 10 000 cycles, and 89.76% capacity retention after storing in air for 30 days. The directional vertical Ti2CTx MXene nanosheets can be extended to other application areas, such as sensors, catalysts, detectors, electromagnetic shielding, etc.
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Frontiers in Chemistry
·
2022
·
IF 5.545
Hu Yingzi,Xu Zhiliang,Pu Junmei,Hu Lanping,Zi You,Wang Mengke,Feng Xingmei,Huang Weichun
The bacterial accumulation at the margins of dental resin composites is a main cause of secondary caries, which may further lead to prosthodontic failure. In this regard, this study for the first time incorporated 2D MXene Ti3C2Tx nanosheets (NSs) into epoxy resin at different mass ratios (0, 0.5, 1.0, and 2.0 wt%) by solution blending and direct curing for dental applications. Compared to the pure resin, the as-fabricated MXene/resin composite not only exhibited improved mechanical and abrasive results but also displayed gradually improved antibacterial activity with MXene loading which was further enhanced by illumination in natural light due to the high photothermal efficiency of MXene. In addition, the cytotoxicity result demonstrated that the MXene-modified resin did not cause severe damage to normal cells. This novel MXene/resin nanocomposite could pave the way for new designs for high-performance, multifunctional nanocomposites to effectively protect dental health in daily life.
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高影响因子
ANALYST
·
2022
·Vol. 147
·期 23
·5557-5563
·
IF 5.227
Lin Mei,Yanmei Shi,Yange Shi,Pengpeng Yan,Chunlei Lin,Yue Sun,Bingjie Wei,Jing Li
Quantum dots functionalization has been proven to be a simple modification strategy for improving the electroanalytical performance of two-dimensional electrode materials by increasing the specific surface area and active reaction sites. Herein, a new electrochemical sensing platform was fabricated by SnO2 quantum dot-functionalized Ti3C2 MXene (Ti3C2-SnO2QDs) for the highly sensitive detection of Sudan I in food. Ti3C2-SnO2QDs were prepared via in situ synthesis, which can control the nucleation and growth of SnO2QDs, resulting in the well-dispersed SnO2QDs with 2–3 nm size on the intersheet surface of MXene. Moreover, the formation of Ti3C2-SnO2QDs can effectively restrict the aggregation of Ti3C2 and improve the stability of SnO2QDs in aquatic environment. The prepared nanocomposite can be used as an improved modified material to further increase the electrocatalytic performance and electrochemical signal of Sudan I on the surface of a glassy carbon electrode. Under optimized conditions, the proposed analytical method displayed a linear dependence for Sudan I concentration ranging from 0.008 to 10 μM with a detection limit of 0.27 nM (S/N = 3) by electrochemical cyclic voltammetry. This sensor with excellent selectivity, reproducibility and accuracy was quantitatively validated in commercial ketchup and chili powder. This Ti3C2-SnO2QDs-based Sudan I sensor is expected to expand the application of MXene nanocomposites in electrochemical analysis and is envisioned as a promising candidate for monitoring illegal food additives in real food samples.
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Zhiqiang Wang,Yingying Guo,Qian Zhang,Zhiyong Li,Yang Zhao,Huiyong Wang
Two-dimensional titanium carbide (Ti 3 C 2 T x ) MXene nanosheets have been widely concerned due to its abundant surface functional groups, high conductivity, excellent photoelectrochemical properties and thermal conductivity. Nevertheless, it is still a challenge for the mass production of high-quality Ti 3 C 2 T x MXene nanosheets. Herein, the bulk Ti 3 C 2 T x MXene powders were stripped into monolayer or few layer nanosheets in propylene carbonate through liquid-phase exfoliation strategy assisted via alkanolamine as intercalators. It is shown that the stripping yield is up to 59.3 %, which is the recorded value for the delamination of Ti 3 C 2 T x MXene nanosheets from bulk Ti 3 C 2 T x MXene powder, and 62.2 % of nanosheets are monolayer. The ability of hydrogen bond donor and molecular size of alkanolamine have important effects on the yield. Moreover, Ti 3 C 2 T x MXene nanosheets have been employed as catalysts in the photocatalytic CO 2 reduction. The yield of CO is 149.7 μmol g -1 h −1 , which is about five times that of bulk Ti 3 C 2 T x MXene powder. This work paves the way for the mass production of MXene nanosheets with high activity photocatalysis.
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ANALYTICAL CHEMISTRY
·
2022
·
IF 8.008
Lijuan Chen,Fan Chen,Gang Liu,Haoliang Lin,Yu Bao,Dongxue Han,Wei Wang,Yingming Ma,Baohua Zhang,Li Niu
Sweat pH is a critical indicator for evaluating human health. With the extensive attention on the wearable and flexible biosensing devices, the technology for the monitoring of human sweat can be realized. In this study, a sensitive, miniaturized, and flexible electrochemical sweat pH sensor was developed for the continuous and real-time monitoring of the hydrogen-ion concentration in human sweat. A flexible electrode was fabricated on the poly(ethylene terephthalate) (PET) substrate by a simple and low-cost screen-printing technology, which was based on the integration of fluoroalkyl silane-functionalized Ti3C2Tx (F–Ti3C2Tx) and the polyaniline (PANI) membrane technology instead of the traditional ion-sensitive membrane. The surface functionalization strategy for Ti3C2Tx with perfluorodecyltrichlorosilane can provide environmental stability. Functionalized Ti3C2Tx (F–Ti3C2Tx) was doped with PANI to obtain improved responsiveness, sensitivity, and reversibility. The constructed microsize, portable, and wearable F–Ti3C2Tx/PANI pH sensor aimed to real-time monitor the pH value of human sweat during exercise. On-body sweat pH monitoring for females and males, respectively, exhibited high accuracy and continuous stability compared with ex situ analyses. This study thus offers a facile and practical solution for developing a highly reliable MXene-based mini-type pH sensor to realize the online monitoring of human sweat pH.
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高影响因子
MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 2
·1-10
·
IF 6.408
Huang Hui,Xie Shuqian,Deng Lu,Yuan Jie,Yue Ruirui,Xu Jingkun
A nanocomposite of rGO/MXene-Pd/rGO with hierarchical structure based on Ti 3 C 2 T x MXene, Pd nanoparticles, and reduced graphene oxide (rGO) was synthesized by a green approach. Ti 3 C 2 T x MXene decorated with Pd nanoparticles (MXene-Pd) was prepared first. Then, graphene oxide (GO), MXene-Pd, and GO were coated on the surface of the glassy carbon electrode (GCE) in sequence. After each coating of the GO layer, the GO nanosheets were reduced to rGO electrochemically. The fabricated rGO/MXene-Pd/rGO hierarchical framework performs a pie structure with MXene-Pd as the stuffing and rGO nanosheets as the crust, which will be beneficial to the enhancement of its electrochemical sensing performance. As compared with other electrodes, the rGO/MXene-Pd/rGO/GCE exhibited higher electrocatalytic activity and better sensing performance for luteolin detection, with a wide linear range of 6.0 × 10 −10 to 8 × 10 −7 M and 1.0 × 10 −6 to 1.0 × 10 −5 M (oxidation peak potential E pa = 0.34 V vs . SCE), a low detection limit of 2.0 × 10 −10 M, and a high sensitivity of 112.72 µA µM −1 cm −2 . Moreover, the fabricated sensor also showed high selectivity, reproducibility, and repeatability toward the detection of luteolin. The real sample analysis for luteolin in honeysuckle was successfully carried out by rGO/MXene-Pd/rGO and verified with high-performance liquid chromatography (HPLC) analysis techniques with acceptable results. All the above tests indicate the promising application prospect of the rGO/MXene-Pd/rGO framework for luteolin detection in honeysuckle and other herbs containing luteolin. Graphical abstract
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Jing Wang,Tianyi Dai,Yuchen Zhou,Amel Mohamed,Guoliang Yuan,Hongbing Jia
Hydrogel-based wearable sensors have gained great interest on account of their huge application in human-machine interfaces, electronic skin, and healthcare monitoring. However, there are still challenges in designing hydrogel-based sensors with high stability in a wide temperature range, superior adhesion, and excellent sensitivity. Herein, sensors based on oxidized sodium alginate (OSA)/polyacrylamide (PAm)/polydopamine-Ti 3 C 2 T X (PMXene) /glycerol/water (Gly/H 2 O) organohydrogels were designed. The organohydrogels exhibited excellent mechanical properties (elongation at break of 1037%, tensile strength of 0.17 MPa), predominant self-healing ability (self-healing efficiency of 91%), as well as high sensing stability in a wide temperature range (from −20 to 60 °C). The introduction of PDA (polydopamine) and viscous glycerin (Gly) provide organohydrogels with superior adhesion. Organohydrogels sensors demonstrated high sensitivity (Gauge Factor, GF = 2.2) due to the combination of ionic and electron conduction. Sensors could stably detect human movement under different strain levels at high and low temperatures, providing a new solution for wearable sensors in extreme conditions.
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高影响因子
Advanced Fiber Materials
·
2022
·Vol. 4
·期 4
·820-831
·
IF 12.958
Liu Yongpeng,Wang Dan,Zhang Chao,Zhao Yan,Ma Piming,Dong Weifu,Huang Yunpeng,Liu Tianxi
Two-dimensional MXene has recently captured widespread research attention in energy storage and conversion fields due to its high conductivity, large specific surface area, and remarkable electro-activity. However, its performance is still hindered by severe self-restacking of MXene flakes. Herein, conductive Ti 3 C 2 T x /carbon nanofiber (CNF) composite aerogel with typical “layer-strut” bracing 3D microscopic architecture has been fabricated via synergistic assembly and freeze-drying process. In virtu of the strong interfacial interaction between polymeric precursor nanofibers and MXene mono-layers, gelation capability and 3D formability of Ti 3 C 2 T x is greatly reinforced, as resulted Ti 3 C 2 T x /CNF aerogels possess a highly ordered microporous structure with interlayered CNF penetrating between large size MXene lamellae. This special configuration guarantees the stability and pliability of the composite aerogels. Furthermore, the 3D form interconnected conductive network and the parallell alignment of the pores allow free electrical carriers motion and ion migration. As a result, the prepared Ti 3 C 2 T x /CNF aerogel-based electrode exhibits an exceptional gravimetric specific capacitance of 268 F g −1 at a current density of 0.5 A g −1 and an excellent cycling stability of 8000 cylcles, and the assembled symmetric supercapacitor, delivers a high energy density of 3.425 W h kg −1 at 6000 W kg −1 . This work offers a new route for the rational construction of 3D MXene assembly for advanced energy storage materials. Graphical abstract
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高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 21
·11375-11385
·
IF 14.511
Yang Dai,Xinyu Wu,Lulu Li,Yu Zhang,Zhiming Deng,Zhong-Zhen Yu,Hao-Bin Zhang
Lightweight and conductive macroscopic MXene-based architectures receive tremendous attention for various potential applications. However, conventional methods are incapable of producing customized structures with controllable functionality and performances. Herein, we demonstrate a three-dimensional (3D) printing of lightweight, resilient, and conductive MXene-based scaffolds with customizability and shape-adaptability by a direct ink writing (DIW) technique. The rheology and printability of the MXene inks are optimized by adding graphene oxide (GO) microgels, ensuring the self-supporting capability of the printed architectures with good structural integrity and connectivity. Moreover, the structure design flexibility and conformation tunability offer unique superiorities to optimize the comprehensive performances of the printed MXene/reduced graphene oxide (RGO) scaffolds. As a result, the lightweight MXene scaffolds show a high electrical conductivity of 1013 S m−1 and a broadband tunable electromagnetic interference (EMI) shielding effectiveness (SE) of above 60 dB in the frequency range of 8.2–26.5 GHz. An optimal value of ∼100 dB and an ultrahigh normalized surface specific SE of up to 19 270 dB cm2 g−1 are far superior to the results of other 3D printed EMI shielding materials. Meanwhile, the hierarchical and robust architectures also deliver an outstanding reversible compressibility of up to 90% strain as well as excellent cyclic fatigue resistance, surpassing the reported rigid and brittle printed MXene structures. This work provides helpful inspiration for structural design and potential applications of 3D printed MXene-based architectures in many areas.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Peng Xu,Peng Wang,Xiang Li,Rui Wei,Xiaojing Wang,Chunyan Yang,Tianyao Shen,Tong Zheng,Guangshan Zhang
CuO-Fe 2 O 3 /MXene was fabricated using a rapid microwave hydrothermal method and used for the enhanced peroxymonosulfate (PMS) activation and atrazine (ATZ) degradation. The ATZ degradation rate could reach up to nearly 100% within 60 min at pH = 6.4, with low dosage for CuO-Fe 2 O 3 /5% MXene (0.1 g‧L -1 ) and PMS (0.37 mM). Experimental results and DFT calculations showed that coexisting matter had little influence on ATZ degradation at low concentrations, indicating the excellent anti-interference capability of the system. Circulation and interaction of ≡Fe(III)/≡Fe(II) and ≡Cu(II)/≡Cu(I) produced SO 4 •- and •OH, O* and SO 5 •- could participate in the formation of 1 O 2 . Then, ATZ degradation pathways, including dealkylation, dichlorination-hydroxylation, alkyl hydroxylation, alkyl oxidation, olefination, and deamination-hydroxylation processes, were proposed based on DFT calculations and ESI-QTOF-MS/MS data. QSAR analysis illustrated that most intermediates were more environmentally friendly than ATZ. This study developed novel materials with superior catalytic performance for elimination of refractory organic pollutants in wastewater.
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RSC Advances
·
2022
·Vol. 12
·期 17
·10267-10279
·
IF 4.036
Yuanyuan Wang,Hang Xu,Mingmei Ding,Lei Zhang,Gang Chen,Jiawei Fu,Ao Wang,Jiapei Chen,Bonan Liu,Wen Yang
Removing salt from dye/salt mixtures using nanofiltration (NF) membranes needs to be improved to ensure high permeability, high selectivity, and antifouling performance. In this study, we used an interfacial polymerization (IP) technique to create a novel thin-film nanocomposite NF membrane by introducing two-dimensional MXene Ti3C2Tx into the polyamide (PA) layer. Enhanced IP reaction rate facilitated the overflow of residual solvent from the fresh PA layer's edge due to the MXene-mediated IP strategy, resulting considerable bubble-like nodules on the membrane surface. The unique nanostructure of PA effective layer could be tuned by controlling the MXene concentration in aqueous phase solution, which finally promoted the obtained membranes with superb permselectivity. In this way, the water permeability was elevated to a maximum value of 45.12 L m−1 h−1, nearly 1.58-fold compared to the PA-pristine membrane. Moreover, the Ti3C2Tx/NF membrane exhibited a superior dye/monovalent salt separation coefficient of 820, outperforming the pristine PA membrane and other NF membranes in the literature. Additionally, the MXene-assisted IP strategy designed an effective dye anti-fouling hydration layer, which played a crucial role in fouling resistance. This work illustrates a novel use of Ti3C2Tx to successfully regulate high-performance TFN PA membranes for potential application in dye/salt separation.
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高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Guang-He Dong,Yu-Qin Mao,Yuan-Qing Li,Pei Huang,Shao-Yun Fu
Designing cathodes with more electroactive materials is a promising way to improve the energy density of batteries while it is highly challenging due to their low electronic/ionic transport, poor structural integrity, and irreversible Li + consumption in full-cell configurations. Herein, we demonstrate a self-supporting cathode based on 3 dimensional MXene-Carbon nanotubes-Cellulose-LiFePO 4 (3D-MCC-LFP). The 3D-MCC-LFP cathodes demonstrate some distinct advantages over conventional LFP cathode (Con-LFP), including higher LFP loading (120 mg cm −2 ) and faster electronic/ionic transport (1.587 S cm −1 /1.18 × 10 −11 cm 2 S −1 ), which result in better electrochemical performance. Such as, the 3D-MCC-LFP 10 cathode (LFP loading is 10 mg cm −2 ) offers a significantly higher capacity of 0.86 mAh cm −2 at 5 C (1 C=170 mA g −1 ) than Con-LFP 10 of 0.05 mAh cm −2 , and a higher retaining capacity of 1.45 mAh cm −2 after 500 cycles at 1 C than Con-LFP 10 (1.16 mAh cm −2 ). Meanwhile, the 3D-MCC-LFP 120 cathode demonstrates an ultrahigh areal capacity of 19.2 mAh cm −2 . Furthermore, the assembled 3D-MCC-LFP 60 /SnO 2 full-cell demonstrates a high areal capacity of 6.3 mAh cm −2 at 1.6 mA cm −2 . Considering its traits of ultrahigh area capacity, excellent electronic/ionic transport and self-supporting characteristics, the 3D-MCC-LFP cathode combined with SnO 2 anode is surely promising for high performance lithium-ion batteries.
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