Advanced Materials Interfaces
·
2022
·Vol. 10
·期 2
·2201767
·
IF 6.389
Min Luo,Junchang Guo,Wenchao Shui,Yao Tan,Haoming Huang,Qinghui Yang,Huaiwu Zhang,Xu Deng,Qi-Ye Wen
Porous polymer-based Terahertz (THz) absorbers possess strong absorption with broadband, lightweight, and flexible features. Thus these are widely desired in THz electromagnetic shielding, radar-cross-section reduction, radiometer calibration, etc. However, the harsh environment of humidity, corrosiveness, and dustiness undermines the performance and service lifetime of the porous absorbers. Here, based on Ti 3 C 2 T x MXene sponge composite foam (MSF), a superhydrophobic broadband THz absorber on a large pore-size porous architecture by a joint hydrophobic strategy is realized. Results show that the apparent contact angles and roll-off angles of the modified MSF reached 159.0° and 7.6°, while maintaining an ultra-high absorption rate of 99.6% in the frequency range of 0.3–1.2 THz. Furthermore, the special Micro-Nano hierarchical structures render the absorber a strong bounce-off ability to the droplets of an aqueous solution. These water-repellent properties endow the absorber the versatility of self-cleaning and anti-corrosion, thus can be widely applied in many scenarios including THz remote sensing, communication, and security screening as well.
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高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2022
·
IF 4.291
Baohui Zhang,Zhiqiong Li,Chong Li,Min Li,Chen Fu,Ran Tao,Xian-hu Zha,Honglang Li,Jingting Luo
This paper demonstrates chemi-resistive type and QCM ammonia sensors based on Ti 3 C 2 T x MXene with surface engineering. The morphology and structure composition of Ti 3 C 2 T x MXene were completely tested by XRD, SEM, TEM and Raman. The ammonia sensing performance of Ti 3 C 2 T x MXene sensors at room temperature were systematically studied. The QCM sensors show better performance towards ammonia than chemi-resistor sensors. The Ti 3 C 2 T x -S QCM sensor possesses quite sensitivity (49 Hz@100 ppb), high response/recovery capability (33 s/58 s) and good selectivity . XPS was introduced for the surface element status for the potential ammonia adsorption mechanism. It can be mainly related to for lowest average potential for reaction of Ti-S and the additional absorption towards the product nitric oxides enhancing the frequency shift by absorption mass increasing. This work confirms that surface engineering of Ti 3 C 2 T x MXene to be effective method for enhancing gas sensing performance, and the sensor shows potential application for low concentration ammonia sensing.
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高影响因子
CARBON
·
2022
·
IF 11.307
Xiaoming Chen,Xin Wang,Kaiqiang Wen,Jiangbin Zhang,Fengwan Zhao,Jie Zhang,Yijie Wang,Qihang Song,Chenglin Yi,Jinyou Shao
High-performance electromagnetic microwave (EM) absorbers demand not only wide effective absorption bandwidth (EAB) and strong absorption capability, but also lightweight and small thickness. In this work, a new strategy was developed to simultaneously strengthen the lossy capacity and reduce the inclusion loading by designing the orientation of inclusions and constructing multilayered gradient structures. Accordingly, Ti 3 C 2 T x MXene fillers were aligned in the same chains by the electric field-assisted alignment technique, forming a parallel-plate structure, throughout epoxy matrix resulting in strong lossy capacity. The widest EAB of aligned 16 wt% MXene/epoxy composite reached 5.08 GHz with a thickness of 1.34 mm. By comparison, the random 16 wt% MXene/epoxy composite exhibited an EAB of only 0.96 GHz with a thickness of 1.96 mm. Further, the impedance matching was optimized by designing multilayered gradient structures based on aligned MXene/epoxy composites. The trilayered gradient structure with an equivalent filler content of 10.97 wt% illustrated the best EAB of 6.01 GHz at only 1.53 mm thickness. In addition, the synergistic effect of the multiple loss mechanisms was also discussed. Overall, the proposed method demonstrates the effectiveness of coupling the alignment of inclusions with gradient structural design to prepare lightweight, thin, and high-performance EM absorbing materials.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Yanan Li,Zhihai Liu,Shuming Li,Pei Nian,Nan Xu,Haiyu Luo,Yibin Wei
Two-dimensional (2D) materials have proved their superiorities as building blocks for constructing high-performance nanofiltration (NF) membranes. Herein, we propose a novel MXene-based NF membrane with high water permeability and stability by intercalating Ag nanoparticles (AgNPs) into the laminar structure of Ti 3 C 2 T x MXene with hyperbranched polyethyleneimine (HPEI) crosslinking. The pure Ti 3 C 2 T x MXene membrane, the AgNP-intercalated Ti 3 C 2 T x MXene (AgNP@Ti 3 C 2 T x MXene) membrane and the AgNP@Ti 3 C 2 T x MXene membrane with HPEI crosslinking (HPEI-AgNP@Ti 3 C 2 T x MXene) were comparatively investigated regarding their physicochemical properties and NF performance. The prepared HPEI-AgNP@Ti 3 C 2 T x MXene membrane exhibited competitive water permeabilities (24.64–30.73 L·m −2 ·h −1 ·bar −1 ) and nearly 100% rejections for Congo red, methyl orange, methyl blue and Rhodamine B solutions for long-term operation. Moreover, the HPEI-AgNP@Ti 3 C 2 T x MXene membrane also showed excellent NF performance for MgSO 4 , MgCl 2 , Na 2 SO 4 and NaCl solutions with the rejections of 84.15%, 77.01%, 74.67% and 56.58%, respectively. The NF separation mechanisms for the HPEI-AgNP@Ti 3 C 2 T x MXene membrane were elucidated based on its unique physicochemical structure. These findings may offer novel insights into tuning the laminar structures of MXene-based NF membranes for enhanced water purification .
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高影响因子
Journal of Materiomics
·
2023
·
IF 9.4
Zehang Zhou,Lingfei Wei,Ya Yi,Shiyi Feng,Zeying Zhan,Dong Tian,Canhui Lu
MXene nanosheets are considered advantageous for functional materials, but current delamination methods to prepare MXene nanosheets have many limitations including high cost, small production scale, low efficiency, and deteriorated structure integrity of obtained nanosheets. Here, we propose a simple, efficient, and scalable shear stress-induced delamination (SSID) strategy to boost the production of single-/few-layered Ti 3 C 2 T x MXene nanosheets. Molecular dynamics simulation indicates that the pan mill-type grinding discs create a strong hydrodynamic flow field, which exerts gigantic shear stress to substantially delaminate the multilayered MXene stacks into homogeneously dispersed MXene nanosheets. Furthermore, shear stress generated from vigorous water flow has limited fragmentation effect, ensuring large lateral size and good structure integrity to the obtained MXene nanosheets as evidenced by the morphological and structural characterizations. Compared to conventional delamination methods, this novel SSID strategy exhibits great advantages in terms of efficiency, scalability and the properties of resultant MXene nanosheets, which opens up great opportunity for the scalable production and commercialization of high-performance MXene-based materials.
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Xusheng Dong,Ruizheng Zhao,Bin Sun,Tengsheng Zhang,Boya Wang,Yanyan He,Tingting Gao,Dongliang Chao,Guowei Zhou
Transition metal selenides are regarded as potential sodium storage materials for their high theoretical capacity and superior electrical conductivity. However, unsatisfied cycle stability and rate capability, which is caused by its intrinsic structural instability and sluggish conversion reaction, greatly hinder the application. Herein, in-situ electrostatic attraction and selenization process are used to construct Ni 0.5 Co 0.5 Se 2 /Ti 3 C 2 T x composite, in which the homogeneous Ni 0.5 Co 0.5 Se 2 nanoparticles are anchored in the Ti 3 C 2 T x MXene architecture. Based on the unique confinement effect and strong chemical interface coupling, the volume expansion and aggregation of the Ni 0.5 Co 0.5 Se 2 /Ti 3 C 2 T x anode during the cycling process are effectively prevented. Furthermore, the evenly Ni 0.5 Co 0.5 Se 2 bimetallic selenides nanoparticles endow rapid charge transfer and redox kinetics due to shortened Na + diffusion distance and more accessible active sites. As a result, the as-prepared Ni 0.5 Co 0.5 Se 2 /Ti 3 C 2 T x anode exhibits long cycle stability over 1000 cycles at 2.0 A g −1 , pushing forward the construction of advanced conversion-type anode for high-performance sodium-ion batteries.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Siqi Gong,Fan Zhao,Yaning Zhang,Huiting Xu,Meng Li,Junjie Qi,Honghai Wang,Zhiying Wang,Yuqi Hu,Xiaobin Fan,Wenchao Peng,Chunli Li,Jiapeng Liu
MXene has drawn considerable attention in energy storage due to particular physicochemical properties. At present, among most near-ambient temperature preparation methods, water is usually served as the main solvent. However, MXene is usually subjected to fast structural degradation on account of water molecules attacking in aqueous solution. Herein, we report a novel water-free etching strategy for synthesizing few-layered Ti 3 C 2 T x MXenes in deep eutectic solvents at near-ambient temperature. Benefitting from the absence of water and macromolecular structure of deep eutectic solvents, the as-synthesized few-layered Ti 3 C 2 T x (DES-Ti 3 C 2 T x ) MXene presents abundant −O terminations and low oxidation degree. As a consequence, the DES-Ti 3 C 2 T x MXene displays excellent specific capacitance of 320 F/g at 2 mV/s. Impressively, the DES-Ti 3 C 2 T x MXene exhibits splendid long-term stability that 97% specific capacitance retention can be acquired over 50 000 cycles at high current density of 50 A/g. Therefore, this study offers a new thought for preparing high performance MXene-based materials by water-free etching method.
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PubMed
高影响因子
Nanoscale
·
2022
·Vol. 14
·期 48
·18010-18021
·
IF 8.307
Guanshun Xie,Chuang Han,Fei Song,Yisong Zhu,Xuanyu Wang,Jialin Wang,Zhenjun Wu,Xiuqiang Xie,Nan Zhang
Engineering the spatial separation and transfer of photogenerated charge carriers has been one of the most enduring research topics in the field of photocatalysis due to its crucial role in determining the performances of photocatalysts. Herein, as a proof-of-concept, Ti3C2Tx MXene is coupled with a typical heterojunction of TiO2@CdS through a co-assembly strategy to boost electron pumping towards improving the photocatalytic efficiency. In addition to the band alignment-mediated electron transfer in TiO2@CdS–Ti3C2Tx heterojunctions, the plasmon-induced electric field enhancement of Ti3C2Tx is found to cooperate with the electron-reservoir role of Ti3C2Tx to extract photoinduced electrons. The synergistic dual functions of Ti3C2Tx promote multichannel electron transfer in TiO2@CdS–Ti3C2Tx hybrids to improve the photocatalytic efficiency. These results intuitively show that there is a wide scope to manipulate the spatial separation and transfer of photoinduced electrons by cultivating the fertile ground of Ti3C2Tx toward boosting the efficiency of solar-to-chemical conversion.
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PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Junmei Liang,Qicheng Zhang,Haibo Zhao,Shaolei Zhao,Yulong Wu,Xiaobin Fan
Hydrodeoxygenation (HDO) of fatty acids to alkanes is key to convert renewable resources into biofuels. Here, we design a new Ti3C2Tx MXene-confined Ni catalyst with extraordinary catalytic performance in the HDO of palmitic acid. Due to the large two-dimensional surface and chemical activity, Ti3C2Tx MXene is able to disperse and anchor Ni particles through strong synergistic coupling. As a consequence, the obtained Ni/Ti3C2Tx catalyst exhibits excellent catalytic performance with a complete conversion of palmitic acid. It can be recycled in five runs without activity reduction, demonstrating good stability of the as-prepared catalyst. The facilitated catalytic performance can be ascribed to the synergic effect of metal Ni and Ti3C2Tx MXene. Ti3C2Tx MXene facilitates the adsorption and conversion of palmitic acid to aldehyde. The dispersed Ni particles benefit from the hydrogenation of hexadecanal intermediate with the cleavage of C–C bonds and the dehydration–hydrogenation of hexadecanol to form alkanes.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Xiangrui Bu,Fa Ma,Qiang Wu,Haiyang Wu,Yubin Yuan,Long Hu,Chuanyu Han,Xiaoli Wang,Weihua Liu,Xin Li
Volatile organic compounds (VOCs) detection in ultra-low concentrations is highly demanded in industry and daily life. Ethanol is one of the most encountered VOCs. Through calcining the precursor of metal-organic frameworks (MOFs), which are in situ grown on 2D Ti 3 C 2 T x sheets, Co 3 O 4 /Ti 3 C 2 T x nanocomposites with the mesoporous structure were synthesized for ethanol sensing. The results showed that the Co 3 O 4 /Ti 3 C 2 T x sensor has an ultra-high response ( (190 towards 50 ppm ethanol), fast response/recovery speed (50 s/45 s to 50 ppm ethanol), a low detection limit (<1 ppm), ideal selectivity and long-term stability. Compared to the pure Co 3 O 4 and Ti 3 C 2 T x sensors, the Co 3 O 4 /Ti 3 C 2 T x nanocomposites sensor significantly improves ethanol-sensing performance. Within the nanocomposites, the 2D Ti 3 C 2 T x nanosheet acts as a favorable platform for the uniform nucleation and growth of Co 3 O 4 , while the mesoporous Co 3 O 4 can provide more adsorption sites for gas sensing. In addition, the formation of hybrid heterojunction is also an essential factor for enhanced sensing behaviors. This work provides a new avenue to develop nanocomposites based on metal oxide and 2D materials for VOCs sensing.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Lin Yang,Pengfei Hou,Baoning Wang,Chunxiang Dall'Agnese,Yohan Dall'Agnese,Gang Chen,Yury Gogotsi,Xing Meng,Xiao-Feng Wang
Cs 2 AgBiBr 6 is considered an emerging candidate for lead-free inorganic double perovskite solar cells (PSCs). However, the photovoltaic performance of Cs 2 AgBiBr 6 is restricted while the reported power conversion efficiencies (PCEs) are almost lower than 3%. Here, we employed D149 indoline dye to sensitize the TiO 2 electron transport layer (ETL) and introduced Ti 3 C 2 T x MXene nanosheets into Cs 2 AgBiBr 6 to enhance its crystallization. Both Cs 2 AgBiBr 6 and D149 indoline dye could contribute to the photocurrent. Moreover, the calculations of the interface properties and electron structure were carried out based on density functional theory. Weak van der Waals forces between the interfaces of Cs 2 AgBiBr 6 and Ti 3 C 2 T x allow the perovskite to retain its semiconductor properties, while effectively weaken the Fermi level pinning (FLP). The high work function of Ti 3 C 2 T x adjusts the valence band of Cs 2 AgBiBr 6 through the Fermi level to improve carrier mobility. As a result, PCEs of 4.47 % under 1 sun illumination and 7.23 % under 200 lx indoor light illumination with enhanced long-term stability were achieved. Hence, this work demonstrates the great potential of Ti 3 C 2 T x for double PSCs and predicts other MXenes with higher work function for further applications.
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高影响因子
Small Science
·
2022
·Vol. 2
·期 7
·2200018
·
IF 0
Yajun Zhang,Long Pan,Peigen Zhang,ZhengMing Sun
High-performance electromagnetic (EM) absorbing materials are in urgent need due to severe EM pollution caused by fast development of communication technology and electronic devices. Gradient structure benefits EM absorbing performance. However, the relevant study is very limited, and the relationship between component layers and overall performance is unclear. Herein, a gradient structure containing impedance matching layer, lossy layer, and reflective layer is built via repeated casting-drying method using Ti 3 C 2 T x MXene and polyvinyl alcohol. With optimized gradient structure, the minimum reflection loss (RL) reaches −74.8 dB with effective absorbing bandwidth (EAB) covering the whole X-band. The good absorbing performance is ascribed to the good impedance matching, which is derived from the stepwisely increased permittivity of each layer. Moreover, it is found that RL reaches the lowest value when lossy layer permittivity is close to the average permittivity of impedance matching layer and reflective layer. In addition, the decrease of lossy layer permittivity causes the decrease of total thickness of the gradient structure. This work demonstrates the effectiveness of gradient structure toward strong and broadband microwave absorption and provides rules for designing proper gradient structures to satisfy different requirements.
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