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
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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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
SENSORS AND ACTUATORS A-PHYSICAL
·
2022
·
IF 4.291
Ruzhan Qin,Xin Li,Mingjun Hu,Guangcun Shan,Ramakrishna Seeram,Ming Yin
Flexible pressure sensors based on MXene have made significant progress in various fields. However, the development of miniature flexible pressure sensors with high sensitivity and wide sensing range remains a challenge. In this study, a flexible pressure sensor based on MXene and polyvinyl alcohol (PVA) with ultra-high sensitivity, wide sensing range, and miniaturization is fabricated. Owing to the synergistic effect of the surface contact and adjustable conductivity, the developed sensor exhibits an ultra-high sensitivity of 2320.9 kPa −1 , low detection limit of ~6 Pa, fast response time of ~70 ms, and durability for more than 10,000 cycles. In addition, the MXene/PVA-based sensor has the advantages of simple preparation, low cost, and easy industrialization. Thus, this work paves the way for new applications in flexible electronics, wearable electronic products, and human–computer interactions. This new design strategy provides a solution to solve the urgent demand for flexible pressure sensors with high sensitivity and wide sensing range.
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高影响因子
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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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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高影响因子
Journal of Energy Storage
·
2022
·
IF 8.907
Changhai Li,Guohua Jiang,Tianqi Liu,Zhiyong Zeng,Pengfei Li,Ruofan Wang,Xueya Zhang
The composite electrode materials (rGO/MXene@NiCoO 2 ) have been prepared by tightly wrapping of reduced graphene oxide (rGO) and MXene to NiCoO 2 nanosheets . The specific capacitance of rGO/MXene@NiCoO 2 -5wt% is 1614 F·g −1 at 0.5 A g −1 , maintains at 1257.5 F·g −1 when increasing the current density to 10 A·g −1 . And the capacitance retention is 77.29% even after 10,000 cycles. It is attributed to the special interlayer network structure of the rGO/MXene@NiCoO 2 composite, which promotes more ion intercalation/deintercalation and improves the structure stability. An asymmetric supercapacitor (ASC) is assembled using rGO/MXene@NiCoO 2 as the positive electrode and rGO/MXene as the negative electrode, respectively. The maximum energy density is 45.15 Wh·kg −1 and the power density is 394.52 W·kg −1 . After 10,000 cycles with current density at 5 A·g −1 , the capacity retention rate is 82.69%. These results demonstrate the potential application of rGO/MXene@NiCoO 2 composite networks as electrode materials for supercapacitors.
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高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Yefeng Feng,Furong Zhou,Yanmin Dai,Zhichao Xu,Qihuang Deng,Cheng Peng
Graphene nanosheets are widely employed for fabricating high-dielectric-constant polymer nanocomposites for energy storage. However, severely reduced electric breakdown strengths of composites with increasing graphene content limit their high-field applications. To improve breakdown strengths of polyvinylidene fluoride/graphene composites without sacrificing dielectric constants, in this work, we proposed a rational strategy of constructing MXene quantum dot inter-layers for preparing ternary composites with desirable electric properties, owing to inter-layer induced quantum confinement and Coulomb blockade effects. Graphene oxide@nitrogen-doped Ti 3 C 2 MXene quantum-dot hybrid nanoparticles were synthesized via hydrogen-bond induced self-assembly route. Binary polymer/graphene and ternary polymer/hybrid-particle nanocomposite films were fabricated by solution cast process. Compared with binary composites, ternary counterparts have synergistically improved dielectric constants and breakdown strengths. Repeated disorder-bounce of electrons and strong coupling between electrons and holes, inside each quantum dot, might be responsible for superior electric performances of ternary composites. High dielectric constant (~53@1 kHz) and breakdown strength (~205 MV m −1 ) were realized in ternary composite with 0.12 wt % of nanoparticles . This work might pave a road for large-scale fabrication of high-performance nanocomposite dielectrics for energy storage.
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高影响因子
Journal of CO2 Utilization
·
2024
·
IF 7.2
Heming Deng,Haoshuang Gu
Two-dimensional membranes are considered the next generation separation membrane with great application potential due to their excellent separation performance, good mechanical strength and thermal stability compared with traditional membrane materials. In this work, the flexible NH 2 -UIO-66@MXene membrane was successfully prepared for gas separation by loading NH 2 -UIO-66 particles onto Ti 3 C 2 nanosheets based on an in-situ growth strategy. A LiF-HCl mixed solution was used as the etchant to obtain the Ti 3 C 2 nanosheets. The loading of NH 2 -UIO-66 particles can regulate the interlayer spacing of Ti 3 C 2 nanosheets, improving the specific surface area of Ti 3 C 2 and the adsorption capacity for specific gases. The -NH 2 group in NH 2 -UIO-66 enabled preferential adsorption of CO 2 over H 2 , and the CO 2 molecules adsorbed in the channel can even block the molecules passing through, increasing the resistance of CO 2 diffusion. As a result, the NH 2 -UIO-66@Ti 3 C 2 hybrid membrane realizes the selective separation of H 2 /CO 2 mixed gas, and the separation selectivity is as high as 155. The gas separation selectivity and permeation of the final prepared NH 2 -UIO-66@MXene were enhanced and exceeded the upper limit of Robeson upper bound (2017).
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高影响因子
Small
·
2022
·Vol. 18
·期 26
·2200857
·
IF 15.153
Hao Cheng,Jiameng Wang,Yongqiang Yang,Huixian Shi,Jing Shi,Xiong Jiao,Peide Han,Xiaohong Yao,Weiyi Chen,Xiaochun Wei,Paul K Chu,Xiangyu Zhang
Light-assisted antibacterial therapy is a promising alternative to antibiotic therapy due to the high antibacterial efficacy without bacterial resistance. Recent research has mainly focused on the use of near-infrared light irradiation to kill bacteria by taking advantage of the synergistic effects rendered by hyperthermia and radical oxygen species. However, photocatalytic antibacterial therapy excited by visible light is more convenient and practical, especially for wounds. Herein, a visible light responsive organic-inorganic hybrid of ZnTCPP/Ti 3 C 2 T X is designed and fabricated to treat bacterial infection with antibacterial efficiency of 99.86% and 99.92% within 10 min against Staphylococcus aureus and Escherichia coli , respectively. The porphyrin-metal complex, ZnTCPP, is assembled on the surface of Ti 3 C 2 T X MXene to capture bacteria electrostatically and the Schottky junction formed between Ti 3 C 2 T X and ZnTCPP promotes visible light utilization, accelerates charge separation, and enhances the mobility of photogenerated charges, and finally increases the photocatalytic activity. As a result of the excellent bacteria capturing ability and photocatalytic antibacterial effects, ZnTCPP/Ti 3 C 2 T X exposed to visible light has excellent antibacterial properties in vitro and in vivo. Therefore, organic-inorganic materials that have been demonstrated to possess good biocompatibility and enhance wound healing have large potential in bio-photocatalysis, antibacterial therapy, as well as antibiotics-free treatment of wounds.
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高影响因子
Advanced Materials Technologies
·
2022
·Vol. 7
·期 10
·2101740
·
IF 8.856
Lianjia Zhao,Xiyao Fu,Hao Xu,Yiqiang Zheng,Wei Han,Lili Wang
Temperature is a basic physical quantity that is essential to life and productivity. However, continuously and efficiently monitoring a full range of temperatures remains a serious challenge. Herein, a full-range (−20 to 100 °C) flexible temperature sensor is designed using Ti 3 C 2 T x MXene as an active conductive skeleton and sodium alginate hydrogel as a heat-sensitive coating layer. The sensor exhibits accurate and stable temperature response across the entire range, with a sensitivity of up to 3244% °C −1 . Moreover, it not only dynamically detects liquid nitrogen, but also effectively senses gradually approaching objects within a certain range. Lastly, a temperature monitoring system based on the sensor realizes the perfect monitoring of a cold-storage model. This work will inject new vitality into the development of temperature sensors.
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高影响因子
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