Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 27
·14364-14373
·
IF 14.511
Meng Jin,Wei Chen,Liu-Xin Liu,Hao-Bin Zhang,Lvxuan Ye,Peng Min,Zhong-Zhen Yu
Conventional conductive Ti3C2Tx MXene films are limited by their low transparency and brittleness. Herein, we demonstrate a crack-template assisted spraying methodology for the fabrication of transparent, flexible, and conductive MXene grid–silver nanowire hierarchical films for high-performance electromagnetic interference (EMI) shielding, joule heating, and resistive touch panel applications. The conductive grid skeletons are constructed by depositing MXene sheets into the cracks of the templates followed by removing the templates. By tuning the loading density of MXene sheets, both optical transmittance and electrical conductivity of MXene grid skeletons can be precisely manipulated. The resultant conductive grid exhibits an EMI shielding efficiency of 21.7 dB and fair transmittance simultaneously. Crucially, one-dimensional silver nanowires (AgNWs) are adopted to construct hierarchical structures for increasing electron transport channels and enhancing light penetration. The hierarchical MXene grid/AgNW film achieves a high transmittance of 81% and an excellent EMI shielding efficiency of 24.6 dB. The transparent, flexible and conductive MXene grid/AgNW film is suitable for transparent heaters and resistive touch panels. The integration of grid fabrication and the hierarchical structure design effectively balances the transparency and the conductivity, and is promising for producing multifunctional films with high transparency, high conductivity, and high EMI shielding efficiency.
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Ubaid Khan,Yijia Luo,Ling Bing Kong,Wenxiu Que
MXenes are 2D materials dominated by carbides and nitrides , whose properties can be tailored for a wide range of applications. Here, generic method was adopted to etch MAX phases through direct redox coupling strategy between the A element and the cation of Lewis acid molten salt, allowing us to anticipate the MAX phase reactivity in molten salt. Fluorine free Ti 3 C 2 MXenes with halogen terminals, such as -Cl, -Br and -I, were synthesized using the molten salts synthesis method. Ti 3 C 2 Cl 2 , Ti 3 C 2 Br 2 and Ti 3 C 2 I 2 exhibit distinct charge-discharge rates and pseudocapacitive like behaviors in 3 M H 2 SO 4 electrolyte, with significant specific capacity of 92 C g −1 , 29 C g −1 and 63 C g −1 , respectively, corresponding to retention rates of 32%, 85.22% and 49.1%, respectively, after 10,000 cycles. The exceptional supercapacitive performances of the Ti 3 C 2 MXenes as electrodes with aqueous electrolytes are attributed to the high electrochemical activity of Cl, Br or I. This study demonstrates the efficacy of the Lewis-acidic-melt etching technique for fine tuning the surface chemistry and hence extending the applications of MXene family.
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DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Lan Ding,Senwei Zeng,Weiye Zhang,Chao Guo,Xinyi Chen,Bo Peng,Zhongpeng Lv,Hongjun Zhou,Quan Xu
Solar-driven photocatalytic hydrogen production is considered an effective strategy to mitigate the current energy and environmental challenges. Herein, a function heterostructure photocatalyst of 1D CdS nanorod rationally supported nitrogen-doped Ti3C2 MXene quantum dots (N-MQDs) is successfully constructed via the self-assembly strategy. Impressively, N-MQDs/CdS exhibits superior photocatalytic hydrogen production performance with an efficiency rate of 17094 μmol g–1 h–1, which is 14.79 times higher than pure CdS. The strong oxidizing performance of N-MQDs/CdS also presents an efficient activity for the photodegradation of phenol. The significant enhancement in performance is mainly due to the synergistic effect of the tight interfacial contact and matched energy levels between the highly conductive Ti3C2 MXene quantum dots and 1D CdS nanorod, which greatly accelerates the separation and transfer of photogenerated carriers. Regulating the energy band structure of photocatalysts via multifunctional MXene materials could hopefully motivate further interest in the reasonable design of MXene-semiconductor photocatalytic materials in energy and environmental applications.
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高影响因子
Materialia
·
2018
·
IF 0
Zhengyang Shen,Zeyi Wang,Min Zhang,Mingxia Gao,Jianjiang Hu,Fang Du,Yongfeng Liu,Hongge Pan
A novel solid-solution MXene (Ti 0.5 V 0.5 ) 3 C 2 is successfully synthesized by exfoliating a solid-solution MAX phase (Ti 0.5 V 0.5 ) 3 AlC 2 , and its catalytic effect on the hydrogen storage reaction of Mg is systemically evaluated for the first time. Typical layer morphology is observed for the prepared (Ti 0.5 V 0.5 ) 3 C 2 , which exhibits a better catalytic activity than that of Ti 3 C 2 . The addition of 10 wt% (Ti 0.5 V 0.5 ) 3 C 2 remarkably reduces the dehydrogenation onset temperature of MgH 2 by 70 °C, from 266 to 196 °C. At 250 °C, approximately 5.0 wt% H 2 is released from the 10 wt% (Ti 0.5 V 0.5 ) 3 C 2 -containing MgH 2 within 20 min. The dehydrogenated sample rapidly absorbs 4.8 wt% H 2 within 5 s at 120 °C; these hydrogenation kinetics are much more superior even to the well-studied Nb 2 O 5 catalyst. The apparent activation energy is calculated to be 77.3 kJ/mol for the MgH 2 -10 wt% (Ti 0.5 V 0.5 ) 3 C 2 sample, which is only around half of that of the pristine MgH 2 (153.8 kJ/mol). This is responsible for the remarkably reduced dehydrogenation operating temperature. Moreover, the chemical states of (Ti 0.5 V 0.5 ) 3 C 2 during dehydrogenation are also analysed and discussed.
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DOI
ChemSusChem
·
2021
·Vol. 14
·期 20
·4422-4430
·
IF 8.928
Zhilin Liu,Hailong Xiong,Yaxiao Luo,Liangliang Zhang,Kuo Hu,Ling Zhang,Yu Gao,Zhen-An Qiao
Graphical The best of both worlds : An interface-induced self-assembly strategy is employed to synthesize ordered mesoporous carbon/Ti 3 C 2 T x heterostructures with high specific surface area and excellent thermostability. The obtained samples combine the advantages of ordered mesoporous carbon and MXene and exhibit superior electrochemical performance. Two-dimensional transition metal carbonitrides (MXene) have demonstrated great potential in many fields. However, the serious aggregation and poor thermodynamic stability of MXene greatly hinder their applications. Here, an interface-induced self-assembly strategy to synthesize ordered mesoporous carbon/Ti 3 C 2 T x heterostructures (OMCTs) was developed. In this method, the composite monomicelles formed by Pluronic F127 and low-molecular-weight phenolic resol self-assembled on the surface of Ti 3 C 2 T x to prevent the restacking of Ti 3 C 2 T x and maintain its thermostability. The obtained OMCTs possessed high specific surface areas (259–544 m 2 g −1 ), large pore volumes (0.296–0.481 cm 3 g −1 ), and excellent thermodynamic stability (up to 600 °C). Benefiting from these advantages, OMCTs serving as the electrode materials for supercapacitor exhibited superior supercapacitor performances, including high capacitance of 247 F g −1 at 0.2 A g −1 , satisfactory rate performance of 190 F g −1 at 5 A g −1 , and cyclability.
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高影响因子
Advanced Science
·
2023
·Vol. 10
·期 28
·2302882
·
IF 15.1
Yanan Huang,Jibing Shen,Shuai Lin,Wenhai Song,Xuebin Zhu,Yuping Sun
High-quality few-layer M 4 C 3 T x (M = V, Nb, Ta) MXenes are very important for applications and are necessary for clarifying their physicochemical properties. However, the difficulty in etching for themselves and the existence of MC/MC 1−δ and M-Al alloy impurities in their M 4 AlC 3 precursors seriously hinder the achievement of defect-free few-layer M 4 C 3 T x (M = V, Nb, Ta) MXenes nanosheets. Herein, three different defect-free few-layer M 4 C 3 T x (M = V, Nb, Ta) nanosheets are obtained by using a universal synthesis strategy of calcination, selective etching, intercalation, and exfoliation. Comprehensive characterizations confirm their defect-free few-layer structure feature, large interlayer spacing (1.702–1.955 nm), types of functional groups (–OH, –F, –O), and abundant valance states (M 5+ , M 4+ , M 3+ , M 2+ , M 0 ). M 4 C 3 T x (M = V, Nb, Ta) free-standing films obtained by vacuum filtration of few-layer M 4 C 3 T x inks show good hydrophilia, high thermostability, and conductivity. A roadmap on synthesis of defect-free few-layer M 4 C 3 T x (M = V, Nb, Ta) nanosheets are proposed and three key points are summarized. This work provides detailed guidelines for the synthesis of other defect-free few-layer MXenes nanosheets, but also will stimulate extensive functional explorations for M 4 C 3 T x (M = V, Nb, Ta) MXenes nanosheets in the future.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Xianhong Zheng,Jinhao Tang,Peng Wang,Zongqian Wang,Lihua Zou,Changlong Li
Flexible, lightweight, and durable electromagnetic interference (EMI) shielding materials are urgently required to solve the increasingly serious electromagnetic radiation pollution. Transition metal carbides/nitrides (MXenes) are promising candidates for EMI shielding materials because of their excellent metallic electrical conductivity . However, MXenes are highly susceptible to oxidization when exposed to wet environments, leading to the loss of their functional properties and degradation of reliability and stability. Herein, an interfused core–shell heterogeneous reduced graphene oxide (rGO)/MXene aerogel (GMA) is designed for the first time via coaxial wet spinning and freeze-drying. The fabricated GMAs exhibit excellent EMI shielding performance, and the EMI shielding effectiveness (SE) and specific EMI SE can be up to 83.3 dB and 3119 dB·cm 3 /g, respectively, which is higher than most carbon-based and MXene-based aerogels and foams. More importantly, GMAs have only a 17.4 % degradation in EMI shielding performance after 120 days due to the protection of hydrophobic graphene sheath, exhibiting superior EMI shielding durability to its MXene film counterpart. Moreover, the hydrophobic GMAs exhibit good oil/water separation and thermal insulation performance. The interfused core–shell GMAs are highly promising for applications in durable EMI shielding, thermal insulation, oil/water separation and sensors, etc.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xianhong Zheng
MXenes have attracted tremendous attention in the area of electrochemical energy-storage devices owing to their high electrical conductivity , pseudocapacitance and two-dimensional lamellar structure . Nevertheless, MXene flakes intrinsically tend to lie flat and restack, resulting in highly tortuous ion transport pathways and inferior ion accessibility. Herein, we develop a femtosecond laser ablation strategy to fabricate flexible and high-performance MXene ribbon supercapacitor electrodes. The fabricated MXene ribbons have porous edges with exposed continuous lamellar channels, which shortens the H + transport pathways, impregnates with sufficient electrolyte, benefits for H + intercalation and ion storage. The resultant MXene ribbons exhibit high specific capacitance (1308.3 mF/cm 2 ), good rate capability and long cycling life (95% capacitance retention and 92% coulombic efficiency after 30,000 cycles). This work provides a new strategy for the rational structure design of high-rate MXene-based supercapacitor electrodes and lays the foundation for the next generation high-performance energy storage devices.
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高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 38
·21766-21773
·
IF 10.733
Shixue Zhang,Huan Liu,Bin Cao,Qizhen Zhu,Peng Zhang,Xin Zhang,Renjie Chen,Feng Wu,Bin Xu
Two-dimensional transition metal carbides (MXenes) have a unique structure, excellent electronic conductivity and a low Li+ diffusion barrier, and show potential for application in energy storage. Especially, MXenes can act as a conductive matrix to achieve excellent lithium storage performance. Herein, a Ti3C2Tx MXene/carbon nanotubes@red phosphorus (Ti3C2Tx/CNTs@P) nanohybrid with stable Ti–O–P bonds is fabricated. The CNTs are introduced into Ti3C2Tx to construct a conductive network, and then the Ti3C2Tx/CNTs are combined with P by a ball-milling method. In this process, the surface oxygen-containing functional groups of Ti3C2Tx interact with P, forming Ti–O–P bonds. Owing to the large capacity contribution of P, the conductive network and buffering role of Ti3C2Tx/CNTs, and the effect of the Ti–O–P bond, the Ti3C2Tx/CNTs@P nanohybrid exhibits a superior reversible capacity of 2598 mA h g−1 at 0.05C (1C = 2600 mA g−1, based on the active material P), excellent cycling stability (2078 mA h g−1 after 500 cycles) and superior rate capability (454 mA h g−1 at 30C). These results demonstrate that the Ti3C2Tx/CNTs@P nanohybrid offers fascinating potential for high-performance lithium-ion batteries.
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高影响因子
Materials
·
2022
·Vol. 15
·期 19
·6770
·
IF 3.748
Zhaoyang Sun,Huamin Chen,Mingqiang Wu,Wei Yang,Jiang Zhao,Zefeng Wang,Shujun Guo,Huining Wang,Weiguo Wang,Jun Wang
The flexible self-powered display system integrating a flexible triboelectric nanogenerator (TENG) and flexible alternating current electroluminescence (ACEL) has attracted increasing attention for its promising potential in human–machine interaction applications. In this work, a performance-enhanced MXene/cellulose nanofibril (CNF)/MXene-based TENG (MCM-TENG) is reported for powering a flexible patterned ACEL device in order to realize self-powered display. The MCM multilayer composite film was self-assembled through the layer-by-layer method. The MCM film concurrently acted as a triboelectric layer and electrode layer due to its high conductivity and strength. Moreover, the effect of CNF concentration and number of layers on the output performance of TENG was investigated. It was found that the MCM-TENG realized the optimum output performance. Finally, a flexible self-powered display device was realized by integrating the flexible TENG and ACEL. The MCM-TENG with an output voltage of ≈90 V at a frequency of 2 Hz was found to be efficient enough to power the ACEL device. Therefore, the as-fabricated flexible TENG demonstrates a promising potential in terms of self-powered displays and human–machine interaction.
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高影响因子
VACUUM
·
2024
·
IF 3.8
Chunjiao Liu,Xiaodong Li
MXene can generate high-temperature pulses (HTP) by the physical/chemical coupling effect under laser irradiance and is a good initiator for laser ignition. The main obstacle in the application on laser ignition of MXene based materials is the incomplete oxidation and reduced energy output resulting from the inert TiO 2 passivation layer. In this study, we proposed an efficient approach to significantly enhance the thermal oxidation and energy release under laser irradiance by decorating hydrophobic 1H,1H,2H,2H-perfluorodecyltriethoxysilane (PFTE). The CFx produced by the decomposition of PFTE under laser irradiance can react with Ti atoms on the surface of MXene to prevent the formation of the oxide layer. This process releases a large amount of heat and completely oxidizes MXene. As expected, some rutile nano-crystals are distributed on the surface of fully oxidized MXene and the energy output of MXene/PFTE composite is 6.1–8.3 kJ/g which is much higher than pristine MXene. The mechanism of the thermal oxidation process is proposed to explain the enhanced energy output of the MXene/PFTE by thermal analysis and time-resolved emission spectrum (TR OES). Furthermore, the MXene/PFTE membrane significantly enhanced the laser ignitibility of 2,4,6,8,10,12-(hexanitrohexaaza)cyclododecane (CL-20) reducing the laser intensity and shortens the ignition time.
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高影响因子
RSC Advances
·
2024
·Vol. 14
·期 47
·34746-34755
·
IF 3.9
Xiaoxia Luo,Xianliang Ren,Hongwei Wang
This work focuses on the application potential of novel MXene materials in the field of uranium-containing wastewater adsorption, particularly addressing gaps in existing research. Ultra-thin layered TiVCTx was selected as the core adsorbent to thoroughly investigate its adsorption performance of uranium(U(VI))-containing wastewater. By compounding with sodium alginate, we successfully prepared easily recoverable aerogel beads and evaluated their adsorption capacity for ultra-low concentrations of U(VI) in seawater. The findings of this study reveal that TiVCTx exhibits optimal adsorption capacity for U(VI) in a weakly acidic environment with a pH of 5.59, and its maximum adsorption capacity for U(VI) reaches up to 336 mg g−1, demonstrating superior performance when it comes to other MXene materials. Further research reveals that the adsorption mechanism involves the synergistic effect of electrostatic adsorption and reduction adsorption, exhibiting monolayer adsorption characteristics, and the adsorption process is a spontaneous endothermic reaction. Notably, in simulated complex seawater environments, even when the U(VI) concentration is as low as, for instance, 3.3 μg L−1, 50 mg of aerogel beads can still achieve an adsorption capacity of 3.89 mg g−1 for 60 L of seawater. These findings underscore the outstanding performance of TiVCTx as a novel MXene material in U(VI) adsorption and its broad potential for practical applications.
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PubMed
高影响因子
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