JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Dong Chen,Tianjiao Zhu,Shen Shen,Yongan Cao,Yangyang Mao,Wenju Wang,Encai Bao,Hongfu Jiang
Lithium-sulfur (Li-S) batteries are regarded as highly prospective energy storage devices. However, problems such as low sulfur utilization, poor cycle performance, and insufficient rate capability hinder the commercial development of Li-S batteries. Three-dimensional (3D) structure materials have been applied to modify the separator of Li-S batteries to suppress the diffusion of lithium polysulfides (LiPSs) and inhibit the transmembrane diffusion of Li + . A vanadium sulfide/titanium carbide (VS 4 /Ti 3 C 2 T x ) MXene composite with a 3D conductive network structure has been synthesized in situ by a simple hydrothermal reaction . VS 4 is uniformly loaded on the Ti 3 C 2 T x nanosheets through vanadium-carbon(V-C) bonds, which effectively inhibits the self-stacking of Ti 3 C 2 T x . The synergistic action of VS 4 and Ti 3 C 2 T x substantially reduces the shuttle of LiPSs, improves interfacial charge transfer, and boosts the kinetics of LiPSs conversion, consequently increasing the rate performance and cycle stability of the battery . The assembled battery has a specific discharge capacity of 657 mAh g -1 after 500 cycles at 1C, with a high capacity retention rate of 71%. The construction of VS 4 /Ti 3 C 2 T x composite with a 3D conductive network structure provides a feasible strategy for the application of polar semiconductor materials in Li-S batteries. It also provides an effective solution for the design of high-performance Li-S batteries.
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高影响因子
Small
·
2023
·Vol. 19
·期 50
·2304946
·
IF 13.3
Renjie Ding,Qian Yan,Fuhua Xue,Pengyang Li,Jinhua Xiong,Xu Zhao,Zonglin Liu,Liangliang Xu,Zhong Chen,Haowen Zheng,Zhigong Tang,Qingyu Peng,Xiaodong He
The thriving 5G communication technology leads to the high demand for EMI shielding materials and thermal management materials. Particularly, portable thermal-sensitive electronic devices have more stringent requirements for thermal insulation performances. In most cases, ultrathin EMI shielding materials integrated with ultralow thermal conductivity are not easy to be achieved. To overcome this obstacle, dual protective porous composite films based on Ti 3 C 2 T x MXene and polyimide are fabricated by sacrificing polymethyl methacrylate (PMMA) templates. By optimizing the contact thermal resistance and Kapitza resistance, the composite film presents superior thermal insulation performances with a thermal conductivity of 0.0136 W m −1 K −1 . Moreover, the hybrid porous film maintains superior EMI shielding effectiveness of 63.0 dB and high SSE/t of 31651.2 dB cm 2 g −1 . Nevertheless, the excellent active and passive heating ability based on Joule heating and photothermal conversion makes the composite film an ideal portable material for thermal management. This work sheds light on designing thermal management materials and EMI shielding materials for cutting-edge electronic devices.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Bin Zeng,Xutao Ning,Linfang Li
Herein, a novel zinc oxide (ZnO) hexagonal cap with exposed polar facets/MXene composite was synthesized via a simple hydrothermal method . The analysis of the morphology and structure of these composites as well as the results of photochemical property measurements showed that a heterojunction was formed between ZnO and MXene . After testing the photocatalytic degradation of methyl orange, the ZnO hexagonal cap with 3 mL MXene showed the highest photodegradation efficiency of 87.8 % within 60 min under a xenon lamp. Active species capture experiments showed that •OH and h + species were the main contributors to the degradation of methyl orange (MO). We proposed a possible mechanism for the excellent photocatalytic activity of ZnO hexagonal cap@Ti 3 C 2 MXene. The Schottky barrier hindering the photogenerated electron recombination, the hexagonal cap morphology with highly active exposed facets, and the hollow structure favoring the adsorption of contaminants were all beneficial to achieve a high catalytic activity. This work provides new insight into the design of metal oxide/MXene photocatalysts .
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ACS Nano
·
2023
·
IF 17.1
Fu-Lin Gao,Ji Liu,Xiao-Peng Li,Qian Ma,Tingting Zhang,Zhong-Zhen Yu,Jie Shang,Run-Wei Li,Xiaofeng Li
Although skin-like sensors that can simultaneously detect various physical stimuli are of fair importance in cutting-edge human–machine interaction, robotic, and healthcare applications, they still face challenges in facile, scalable, and cost-effective production using conventional active materials. The emerging two-dimensional transition metal carbide, Ti3C2Tx MXene, integrated with favorable thermoelectric properties, metallic-like conductivity, and a hydrophilic surface, is promising for solving these problems. Herein, skin-like multifunctional sensors are designed to precisely detect and distinguish temperature and pressure stimuli without cross-talk by decorating elastic and porous substrates with MXene sheets. Because the combination of the thermoelectric and conductive MXene with the thermally insulating, elastic, and porous substrate integrates efficient Seebeck and piezoresistive effects, the resultant sensor exhibits not only an ultralow detection limit (0.05 K), high signal-to-noise ratio, and excellent cycling stability for temperature detection but also high sensitivity, fast response time, and outstanding durability for pressure detection. Based on the impressive dual-mode sensing properties and independent temperature and pressure detections, a multimode input terminal and an electronic skin are created, exhibiting great potential in robotic and human–machine interaction applications. This work provides a scalable fabrication of multifunctional tactile sensors for precisely detecting and distinguishing temperature and pressure stimuli.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Junjie Qi,Yufen Zhang,Jinjin Wen,Haonan Zhai,Meng Li,Yaning Zhang,Huiting Xu,Wenyue Yang,Chunli Li,Honghai Wang,Wenchao Peng,Jiapeng Liu
Aqueous zinc ion batteries (AZIBs) have gained extensive attention due to the numerous advantages of zinc, such as low redox potential, high abundance, low cost as well as high theoretical specific capacity. However, the development of AZIBs is still hampered due to the lack of suitable cathodes. In this work, the freestanding defective ammonium vanadate@MXene (d-NVO@MXene) hybrid film was synthesized by simple vacuum filtration strategy. Due to the presence of the hierarchical freestanding structure, outstanding MXene conductive networks and abundant oxygen vacancy (in the d-NVO nanoribbons), the d-NVO@MXene hybrid film can not only expose more active sites but also possess outstanding conductivity and kinetics of charge transfer/ion diffusion. When the d-NVO@MXene hybrid film was directly used as the cathode, it displayed a high specific capacity of 498 mAh/g at 0.5 A/g and superior cycling stability performance with near 100 % coulomb efficiency. Furthermore, the corresponding storage mechanism was elucidated by ex situ various characterizations. This work provides new ideas for the development of freestanding vanadium-based cathode materials for AZIBs.
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International Journal of Green Energy
·
2023
·
IF 3.3
Zefeng Zhang,Xianli Fang,Haiyan Qian
ZnS is a well-known photocatalyst in the field of water treatment, but its applicability is limited due to poor visible light sensitivity, low photon efficiency, and photo corrosion. In this study, a new type of ZnS/Ti3C2Tx composite photocatalyst was developed by growing ZnS microspheres on a single-layer Ti3C2Tx, which is based on the sheet-like structure and metal-like characteristics of Ti3C2Tx. The resulting Ti3C2Tx-based composite photocatalyst with ZT0.35% showed superior catalytic activity in the degradation of methyl orange under natural light. The catalytic rate constant was 3.51 times higher than that of ZnS alone, reaching a maximum of 0.0244 min−1. Within 120 minutes, the degradation rate of methyl orange was 96.3%, while that of ZnS was only 41.6%. Photoluminescence and free radical scavenging experiments revealed that the composite structure is responsible for the improved photocatalytic activity and that the ZnS/Ti3C2Tx structure is favorable for the separation and transport of photogenerated carriers. The developed ZnS/Ti3C2Tx composite has great potential as a photocatalyst for the degradation of organic contaminants.
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International Journal of Applied Ceramic Technology
·
2022
·Vol. 20
·期 1
·251-260
·
IF 2.328
Fada Wei,Qinghua Liu,Heqiang Liu,Guohong Wang,Minghang Li,Mingxing Li,Xingmin Liu
The proliferation of electronic devices and wireless communication is leading to serious electromagnetic (EM) interference. In this work, Ti 3 C 2 /cement composites were developed as high efficiency EM functional materials by introducing exfoliated Ti 3 C 2 T x MXene with cement for green buildings with EM shielding function. In the composites, few-layered Ti 3 C 2 MXene were dispersed homogeneously throughout the cement matrix. The EM properties of the composites were studied as a function of the MXene content. With increasing MXene content, real and imaginary part of permittivity was significantly improved owing to the polarization and electrical conduction caused by the MXene phase. Composites with 15 wt.% MXene showed good EM absorbing properties with a maximum effective absorbing bandwidth of 2.67 GHz. Strong EM shielding can be achieved when MXene content increased to 25 wt.%. The EM shielding effectiveness of such composites was higher than 22.0 dB, and the dominating shielding mechanism was EM absorption. This work finds new materials for the development of advanced green buildings with EM shielding function.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Liyi Zhang,Yongcong Liu,Guangyong Zeng,Zhaomei Yang,Qingquan Lin,Yanyong Wang,Xiaoguang Wang,Shengyan Pu
MXene-based two-dimensional (2D) material membranes have attracted an increasing number of attentions in the field of separation and purification. However, the easily oil-pollution of MXene membrane still limit its further application for oil/water separation. In this work, Na-Bentonite was embedded into MXene nanosheets and then a series of Na-Bentonite@MXene (NBM) composite membranes were prepared by one-step hydrothermal pretreatment and vacuum self-assembly on polyvinylidene fluoride membrane surface. The modified composite membranes exhibited excellent separation performances with a rejection ratio above 96 % and a flux recovery rate (FRR) higher than 86 % after 8 cycling tests for oil/water emulsion. In addition, the sandwich structure consisting of MXene nanosheets and Na-Bentonite could not only play a positive role in the stability of composite membrane, but also formed a special micro-nano structure on membrane surface, resulting in a switchable wettability of composite membrane. When the membrane surface was pretreated with water or oil, it presented hydrophilic/hydrophobic or hydrophobic/oleophilic surfaces, respectively, which realized the effective separation for different components in oil/water emulsion. This work provides a new method for the design and construction of MXene-based 2D membrane with continuous anti-fouling capacity, which shows a great application potential in the treatment of oily wastewater.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Dekui Song,Mei-Jiao Zeng,Peng Min,Xue-Qin Jia,Fu-Lin Gao,Zhong-Zhen Yu,Xiaofeng Li
Although piezoresistive sensors have wide applications in human motion detection and wearable electronics, it is still a challenge to produce multifunctional and integrated sensors with wide working ranges and linear sensing responses. Herein, electrically conductive, highly compressible, and structurally anisotropic MXene-wood (MW) sponges are fabricated by converting balsa wood blocks to compressible wood sponges with extremely low density and highly anisotropic porous structure, followed by decorating with conductive MXene sheets. The MW sponge is utilized to assemble a piezoresistive sensor with a large working range of 0–25 kPa, wide linear sensing ranges of 5%–50% and 0–180°, and excellent long-term reliability under a bending angle of 30° for 5000 cycles. Additionally, the sensor is suitable for monitoring practical human physiological signals including pulse beating, and finger and wrist bending. An all-MW sponge-based multifunctional and integrated sensing system is constructed by integrating the MW sponge piezoresistive sensor, the MW sponge-based solid-state supercapacitor, and the MW sponge electrophysiological electrodes. The sensing system can concurrently detect surface electromyogram and tactile pressures, and hence realize real-time closed-loop controls. The multifunctional and integrated MW sponge sensing system would have great potentials in real-time pressure recognition and human-machine interfaces.
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ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Krishnan Subramanyan,Sanming Chen,Na Li,Tingting Ma,Yongping Liu,Sundaram Chandrasekaran,Vanchiappan Aravindan
We report an MXene V 4 C 3 T x new low-voltage insertion anode and a comparison of the electrochemical performance with ester and ether-based electrolytes in half– and full–cell configuration with Na 3 V 2 (PO 4 ) 3 @C (NVPC). Though MXene has been explored for Na-ion batteries (SIB), M n +1 X n T x with n = 3 has been hardly explored. Moreover, the ether-based electrolyte has not been used with any MXenes for electrochemical energy storage , especially in the SIB perspective. The initial irreversibility in the carbonate-based half–cell (V 4 C 3 T x –C) is 128 mAh g −1 more than the tetraglyme–based half–cell (V 4 C 3 T x –T). After 100 cycles, V 4 C 3 T x –T maintains 84 mAh g −1 , while V 4 C 3 T x –C shows only 60 mAh g −1 , which shows the better retention ability in the ether-based system. As for the rate performance, though V 4 C 3 T x –T has a higher capacity in low currents, at higher currents, V 4 C 3 T x –C shows higher values. This showed that the carbonate-based system has diffusion and capacitive-based Na–ion storage, which enabled it to have a high–rate performance. An extensive in–situ impedance study revealed significant formation of the passivation layer in V 4 C 3 T x –C by irreversibly consuming Na–ions, which causes an increased initial Coulombic inefficiency, whereas no such significant SEI layer formation is evident for V 4 C 3 T x –T. Full–cells were assembled with NVPC cathode in tetraglyme and carbonate-based electrolytes. The full–cell with ether electrolyte exhibited enhanced capacity, capacity retention, and rate performance compared to ester-based electrolytes. The full-cell displayed an energy density of ∼66 and ∼74 Wh kg −1 for tetraglyme and ester-based electrolytes, respectively.
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高影响因子
CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Shuwei Tang,Zhengguo Wu,Xiaoyun Li,Fengwei Xie,Dongdong Ye,Eduardo Ruiz-Hitzky,Lansheng Wei,Xiaoying Wang
Super strength and high barrier properties are the bottleneck of the application of cellulose film materials. Herein, it is reported a flexible gas barrier film with nacre-like layered structure, in which 1D TEMPO-oxidized nanocellulose (TNF) and 2D MXene self-assembled to form an interwoven stack structure with 0D AgNPs filling the void space. The strong interaction and dense structure endowed TNF/MX/AgNPs film with mechanical properties far superior to PE films and acid-base stability. Importantly, the film presented ultra-low oxygen permeability confirmed by molecular dynamics simulations and better barrier properties to volatile organic gases than PE films. It is here considered the tortuous path diffusion mechanism of the composite film responsible for the enhanced gas barrier performance. The TNF/MX/AgNPs film also possessed antibacterial properties , biocompatibility and degradability (completely degraded after 150 days in soil). Collectively, the TNF/MX/AgNPs film brings innovative insights into the design and fabrication of high-performance materials.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Liang Zhou,Huimin Qi,Yang Lei,Jiaxin Yu,Baogang Guo,Ding Zhang
Copolymers of polyimide and polyuria with different fractions were synthesized. Furthermore, Ti 3 C 2 MXene two-dimensional material was obtained by etching Ti 3 AlC 2 with hydrofluoric acid. It was demonstrated that the copolymers displayed outstanding tribological performance than that of pure polymers and the as-synthesized Ti 3 C 2 MXene were endowed with outstanding dispersion in above copolymer. Importantly, when used as a solid lubricant additive at different temperatures, the two-dimensional material showed excellent friction reducing and antiwear properties. That is, blending even a small fraction of Ti 3 C 2 MXene into the copolymer dramatically reduced the friction and wear of the friction pair. SEM mappings and XPS analyses revealed that a continuous tribofilm consisting of a high fraction of tribo-chemical products and TiO 2 was established on the rubbed surfaces, which were significant in improving the lubrication performance at different temperatures.
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