COMPOSITES SCIENCE AND TECHNOLOGY
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2022
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IF 9.879
Meng Ma,Xianjun Liao,Qindan Chu,Si Chen,Yanqin Shi,Huiwen He,Xu Wang
The development of electronic communication technology leads to a complex electromagnetic (EM) environment, which is urgent for the design of high-performance EM interference (EMI) shielding materials. In this work, cellulose nanofiber (CNF) and MXene were used to construct ordered multi-layer composite films with a controllable conductive gradient by layer-by-layer vacuum filtration method. Especially, the films were composed of four transition layers (with low MXene content) and one reflection layer (with high MXene content), which not only effectively reduced the reflection of EM waves on the surface of materials but also greatly increased the multiple internal reflections of reflected EM waves. Besides, the dielectric loss provided by MXene, and the coordination of polarization with loss at the interfaces contribute to the outstanding EMI shielding effectiveness (EMI SE) (39 dB) and absorption effectiveness (28 dB) of the films. And practical application simulation proves that the composite membrane can limit the mobile phone communication signal. Moreover, the nacre-like structure was constructed by 1D CNF and 2D MXene, resulting in high tensile strength of 90.5 ± 6.7 MPa and elongation at a break of 8.0 ± 1.0%. Therefore, this work provided a feasible approach for preparing gradient composite films with high EMI shielding and mechanical properties , which is highly promising to be a competitive candidate for the application in the new-generation of intelligent electronic devices.
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高影响因子
ACS Applied Nano Materials
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2022
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IF 6.14
Lian Yin,Kaili Gong,Haifeng Pan,Liangjie Guo,Keqing Zhou
Thermosetting epoxy resin (EP) has a high fire hazard that generates a lot of heat and toxic fumes, which is considered a prominent drawback that limits the practical application of EP. Therefore, inspired by the column-to-beam architecture, the BN-PDA-MXene nanohybrid was developed via covalent cross-linking and hydrogen bonding. The results showed that the stable column-to-beam architecture not only prevented the stacking of 2D nanosheets but also built a labyrinth-type array in the EP matrix, which was beneficial to enhancing the thermal stability and flame-retardant performance of EP composites. In particular, with the addition of the 2% BN-PDA-MXene nanohybrid, the maximum mass loss rate (MLRmax) of the EP composite was reduced and the char residue increased. Meanwhile, compared with pure EP, there was a marked reduction of 22.2% in the peak heat release rate, demonstrating the suppressed heat release. Furthermore, EP/BN-PDA-MXene had excellent smoke suppression performance, which was mainly reflected by the downward trend of the peak smoke production rate, total smoke production, and peak CO production rate, together with an obvious reduction of 39.9% in smoke factor. By studying the char residue, it was confirmed that the BN-PDA-MXene nanohybrid had a certain inhibitory effect on the fire hazard of EP due to its lamellar barrier effect, as well as the catalytic detoxification and catalytic carbonization of transition elements.
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高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2022
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IF 9.879
Haiyang Li,Xuanhe Ru,Ying Song,Huanping Wang,Chenhui Yang,Lei Gong,Zhenguo Liu,Qiuyu Zhang,Yanhui Chen
As the application environment of electromagnetic interference (EMI) shielding composites becomes increasingly complex and changeful, the polymer materials with excellent mechanical properties and EMI shielding effectiveness (EMI SE) are highly desired, in order to maintain the long-term operation of equipment. Herein, we report a series of flexible and self-healing EMI shielding composites, which are developed by first constructing a highly electrically conductive 3D porous Ti 3 C 2 T x MXene/reduced graphene oxide (rGO) hybrid aerogel (MRG) by the freeze-drying and chemical reduction methods, and subsequently introducing dynamic crosslinked polyurethane containing Diels–Alder bonds (PUDA) into MRG by the vacuum assisted impregnation method. The 3D MXene/rGO/PUDA (MRGP) composites show a high EMI SE of 39.1 dB at an ultra-low 0.46 vol% of MXene and 0.65 vol% of rGO loading in the range of X-band (8.2–12.4 GHz), and the EMI SE can recover to 34.1 dB after three times of severing/healing cycles, retaining 91.4% of the EMI SE of the initial sample. In addition, the EMI SE of thrice healed MRGP composite hardly changes after 5000 bending cycles. The flexible and self-healing EMI shielding PUDA composites in our work show great potential application for long-term protection of portable communication electronic equipment.
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高影响因子
RARE METALS
·
2022
·Vol. 41
·期 7
·2405-2416
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IF 6.318
Cui Song-Song,Liu Xuan,Shi Yin-Biao,Ding Ming-Ye,Yang Xiao-Fei
Exploring efficient co-catalysts to accurately steer the charge separation of semiconductor photocatalysts is highly desired yet remains challenging. Here, we tackle the significant challenge by in situ growing the Bi 12 O 17 Cl 2 photocatalyst onto two-dimensional (2D) Cl-terminated Ti 3 C 2 MXene to construct 2D/2D heterojunction of Bi 12 O 17 Cl 2 and Ti 3 C 2 . Firstly, 2D few-layered Ti 3 C 2 MXene with chlorine groups has been successfully synthesized by Lewis acidic etching strategy with subsequent ultrasonic exfoliation. The grafting of chlorine terminations on the surface of MXene serves as nucleating centers and growth platform, resulting in the formation of strong interfacial bonds (Bi–Cl–Ti) between Bi 12 O 17 Cl 2 and Ti 3 C 2 . These strong bonds can facilitate the separation and transfer of photo-generated charge carriers between Bi 12 O 17 Cl 2 photocatalyst and Ti 3 C 2 cocatalyst. As expected, the photocatalytic degradation rate of Bi 12 O 17 Cl 2 /Ti 3 C 2 hybrids is 9.7 times higher than that of bare Bi 12 O 17 Cl 2 nanosheets. This work not only exhibits a new design concept to effectively steer the charge separation for photocatalysis, but also gives a reference for constructing efficient MXene-based photocatalytic systems. Graphical abstract
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Wen Long Liu,Yong Qiang Guo,Tao Lin,Hong Chao Peng,Ya Ping Yu,Fan Yang,Sheng Chen
MXene-based electrodes have shown great performance as flexible supercapacitors in the application of portable and wearable electronics. Nevertheless, 2D MXene nanosheets suffer from severe self-stacking issues during electrode preparation, which can significantly limit the charge storage capacity. Herein, a simple yet efficient strategy is developed for fabricating the supercapacitor electrode based on the MXene@PANI coated activated carbon cloth (MXene@PANI-ACC). The resulting MXene@PANI-ACC possesses 2D/0D/1D hierarchical nanostructures , where the 1D carbon fibers are uniformly coated with MXene@PANI nanocomposites and the 0D PANI nanoparticles are densely anchored on the surfaces of the 2D MXene nanosheets. This hierarchical structure can effectively tackle the restacking issue of MXene nanosheets during electrode fabrication and provide the obtained electrode with good conductivity for fast electron transfer . Benefiting from those features, this MXene@PANI-ACC electrode demonstrates an excellent area capacitance of 1347 mF/cm 2 at a current density of 1 mA/cm 2 and can retain of its original capacity at 20 mA/cm 2 after 5000 cycles. The excellent electrochemical performance highlights great promise of the developed electrode with hierarchical nanostructures for applications in high-performance energy storage devices.
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高影响因子
JOURNAL OF POWER SOURCES
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2022
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IF 9.794
Zhilin Zhao,Xinming Wu,Chunyan Luo,Yidan Yang
To address the limitations of flexible asymmetric supercapacitor (FASC) with poor stability and low capacitance, highly electrochemically active materials and rational structural design are urgently needed. Herein, a lamellar interwoven heterostructure of NiAlP/NiAl-LDHs@MXene composite electrode with high capacitance and cycling stability was fabricated by hydrothermal reaction and electrostatic assembly. As a result, the NiAlP/NiAl-LDHs@MXene hybrid electrode delivers a high specific capacitance of 3.88 F cm −2 (2589.3 F g −1 ) and excellent cycling stability (91.1% capacity retention after 8000 cycles) at 1.0 mA cm −2 . In addition, the fabricated NiAlP/NiAl-LDHs@MXene//AC FASC exhibits a higher power density of 1800 W kg −1 at the energy density of 81.1 Wh kg −1 . It is worth noting that FASC still exhibits good structural integrity and outstanding stability (96.9% capacity retention after 10000 cycles) after being folded at different angles. Comparative experiments and density functional theory (DFT) reveal that the synergistic effect of NiAlP@NiAl-LDHs and Ti 3 C 2 Cl 2 MXene can provides a large number of hierarchical channels and generates more active sites, which accelerates the rapid migration of electrons and ions during charge and discharge. This work not only provides a promising electrode material for energy storage, but also opens a new idea for the selection of electrode materials for flexible wearable electronic devices.
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高影响因子
Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Hongshan Wang,Zhenzhen He,Qiangbin Yang,Guangyong Zeng,Zhaomei Yang,Shengyan Pu
MXene nanosheets were functionalized by introducing sodium lignosulfonate (LS) containing abundant hydrophilic groups (sulfonic acid groups and phenolic hydroxyl groups), along with the intercalation of MoS 2 nanosheets between the functionalized MXene layers. A pressure-assisted self-assembly was utilized for the fabrication of a two-dimensional (2D) MXene membrane with high water permeation and excellent dye separation characteristics. The MoS 2 @LS-MXene composite membrane has excellent pure water flux (188.1 L·m -2 ·h -1 ), which is 85% higher than that of the unfunctionalized MXene membrane, and has a good rejection effect on dye molecules (93% for Congo red (CR), and 99% for Rhodamine B (RhB)). The appropriate interlayer spacing and negative surface charge resulted low rejection of salts (4.2% of NaCl, 4.6% of Na 2 SO 4 ) in dye-salt hybrid system, consequently leading to their mutual separation. The composite membrane also exhibits excellent stability and anti-fouling ability. This study provides a simple and novel design idea for the preparation of high-performance 2D MXene membrane.
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高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2022
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IF 6.76
Yuxi Sun,Yu Wang,Huaxia Deng,Min Sang,Xinglong Gong
To improve the sedimentation stability of carbonyl iron (CI)-based magnetorheological fluid (MRF), a novel MRF with CI/MXene particles as dispersed phase was prepared. CI/MXene particles were prepared by attaching the lightweight MXene nanosheets onto the surface of CI particles (CIPs) as an additive. The micro-morphology, crystal structure and element composition of CI/MXene particles were analyzed by SEM, XRD and XPS characterization respectively, which confirmed the successful synthesis of CI/MXene particles. CI/MXene-based MRF possessed considerable high magnetorheological (MR) effect, and the magneto-induced shear stress was up to 49 kPa. More importantly, the sedimentation ratio of CI/MXene-based MRF was further characterized to evaluate its stability. Experimental results showed that the sedimentation ratio of MRF increased from 75.7% to 98.0% after mixing CIPs with 3 wt% MXene nanosheets. The sedimentation ratio of CI/MXene-based MRF increased by 29.5% compared to CI-based MRF. As a result, the addition of MXene nanosheets significantly improved the sedimentation stability of MRF while maintained high MR effect.
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Yuxiang Wei,Dekai Wu,Chaoyou Yong,Zhenni Wang,Peng Zhong,Jiajun Qiu,Jiatong Fan,Jie Sun,Yimin Lei,Xiaoqiang Wu
Electrocatalysts play an important role in the cathodic Oxygen Reduction Reaction (ORR) of fuel cells. Because of the high cost, poor cycle stability and methanol tolerance, the commercial Pt/C catalysts have been seriously restricted during large-scale application and development in electrochemical devices. The development of non-noble metal ORR catalysts is one of the effective ways to achieve fuel cell cost reduction and performance improvement at the same time. In this work, Ti 4 O 7 /MXene nanocomposites were synthesized through hydrothermal followed by carbothermal reduction reactions. Such catalysts exhibit large electrochemical active surface area (ECSA = 215.74 cm 2 ) and excellent ORR catalytic activity in alkaline media. The initial potential and half-wave potential were confirmed to be 0.91 V and 0.72 V with the electron transfer number of 3.3. In addition, the Ti 4 O 7 /MXene catalysts have better cyclic stability and methanol tolerance than commercial Pt/C catalyst. This study provides a new idea and method for the innovative preparation of MXene-based composite electrocatalysts.
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高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Jiajun Xu,Shiyu Tang,Dong Liu,Zhihui Bai,Xinyue Xie,Xiaoshuang Tian,Weiting Xu,Wenjie Hou,Xiuxia Meng,Naitao Yang
Multilayered structures with abundant interfaces are highly desired for reducing the thickness and improving electromagnetic (EM) attenuation ability. Herein, elaborately designed laminar Fe 3 O 4 /MXene nanosheets exhibit great potential as high-efficiency and lightweight absorbers due to heterogeneous structure coupled with intensive magnetic-dielectric synergistic effect. The MXene nanosheets with metallic conductivity not only serve as a supporter to carry the magnetic Fe 3 O 4 , but also provide massive interfaces to facilitate the transport of charge carriers. Hollow Fe 3 O 4 microspheres were evenly dispersed without apparent agglomeration on the MXene surface, giving rise to largely enhanced consumption ability of –42.7 dB over a broad qualified bandwidth (5.7 GHz) at 2.5 mm. Besides, static density functional theory (DFT) method was introduced to shed light on the absorption mechanism by portraying the interaction between the Fe 3 O 4 and MXene. This study provides a crucial strategy for designing magnetic-supported composites by means of a large family of MXenes as thin and lightweight EM absorbers.
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高影响因子
Nano Energy
·
2021
·
IF 17.881
Shi-Neng Li,Zhi-Ran Yu,Bi-Fan Guo,Kun-Yu Guo,Yang Li,Li-Xiu Gong,Li Zhao,Joonho Bae,Long-Cheng Tang
Conductive hydrogels are promising in the flexible wearable electronic applications due to their unique feature of intrinsic stretchability, reversible flexibility, and high electrical conductivity . However, severely poor adaptability under cold or hot environmental conditions along with inferior adhesiveness to various substrates greatly hinders the potential applications in such emerging field. Herein, we describe a mechanically flexible and electrically conductive nanocomposite hydrogel composed of polyacrylamide-co-acrylic acid/chitosan covalent-network reinforced by Ti 3 C 2 T x MXene nanosheets within water-glycerol binary solvent via a simple one-pot free radical polymerization . Notably, incorporation of a low content (0.1–0.3 wt%) of MXene promotes the rapid gelation of the polymer molecules in only 10 min. The optimized hydrogel containing 0.2 wt% MXene not only possesses excellent mechanical performance (e.g., tensile elongation of ~1000%) and improved electrical conductivity (~1.34 S/m), but also shows stable temperature tolerance from − 20 to 80 °C and self-adhesion with various substrates (e.g., steel, glass, rubber, plastics and skin) as well as a rapid self-healable feature (~1.3 s). Further, such hybrid MXene hydrogel exhibits dual sensations under different strain (1–600%) and stress (80–3200 Pa) ranges, good applicability for various deformation conditions (tension/bend/compression), and wide temperature adoptability with stable repeatability. Clearly, this versatile MXene nanocomposite hydrogel developed may provide a new route for the rational design and development of advanced skin-like sensor for complex environmental application.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Yuxuan Zhang,Zhilin Zhao,Chunyan Luo,Xinming Wu,Weixing Chen
Interlayer ion modification of MXene is one of the effective ways to improve the pseudocapacitance performance. However, the origin of electrochemical capacitance mechanism still remains elusive due to the effect of different kinds of ion interlayer modification. In this work, interlayer modification of MXene (Ti 3 C 2 Cl 2 ) with inorganic ions (NaCl) and organic macromolecular ions (cetyl trimethyl ammonium bromide cation, CTAB) were carried out by ion ultrasonic intercalation and the electrochemical capacitance mechanism was investigated. It was found that MXene- CTAB has higher specific capacitance (258.28F g −1 Vs 225.55F g −1 ) and better cycle stability (93% retention Vs 85% retention after 3000 cycles) than MXene-NaCl. Such a large difference in electrochemical energy storage performance is mainly due to two points : (1) Organic macromolecular CTAB can effectively expand the layer spacing of MXene, which is conducive to the storage of electrolyte ions. (2) Compared with inorganic ions, organic macromolecular ions not only have redox reaction with interlayer ions of MXene, but also can adsorb counter ions in the electrolyte, thus providing additional pseudocapacitance. This work opens up a new way for the development of high-performance MXene based electrode materials.
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高影响因子
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