Materials Today Physics
·
2021
·
IF 9.298
Fengqi Qi,Lei Wang,Yali Zhang,Zhonglei Ma,Hua Qiu,Junwei Gu
Lightweight and robust electromagnetic interference (EMI) shielding materials are highly desirable in high-end precision electronic components and 5G communication system . Herein, the starch based porous carbon foam (PCF) is prepared by yeast fermentation, steam foaming and carbonization approach with flour as raw material. The Ti 3 C 2 T x MXene/PCF (MPCF) composites are then fabricated via vacuum assisted impregnation of Ti 3 C 2 T x MXene followed by freeze drying. The obtained PCF presents excellent compression strength and superior electrical properties. The compression strength and electrical conductivity ( σ ) of the PCF carbonized at 1400 °C are 4.9 MPa and 21.8 S/cm, respectively. The MPCF composites with 8.5 wt% Ti 3 C 2 T x MXene exhibits superior EMI shielding effectiveness (EMI SE) and specific shielding effectiveness (SSE, EMI SE/ ρ ) of 75 dB and 216.9 dB cm 3 /g, respectively. Meanwhile, the MPCF composites possess excellent flame retardancy and outstanding heat insulation performances, and can be applied in the extreme environments. The resultant lightweight, robust and multifunctional MPCF composites with simple fabrication processes show broad application prospects for EMI shielding systems in aerospace, military engineering, electrical and electronics fields.
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ANALYST
·
2021
·Vol. 146
·期 24
·7593-7600
·
IF 4.616
Ling Lei,Caoling Li,Wensheng Huang,Kangbing Wu
Developing a sensitive and rapid detection method for 4-chlorophenol (4-CP) and 4-nitrophenol (4-NP) is very important due to their high toxicity. In this work, bulk Ti3AlC2 powder was etched to Ti3C2Tx for the first time through a hydrothermal reaction in NaF/HCl solution. After ultrasonication in N-methylpyrrolidone (NMP), Ti3C2Tx powder was successfully exfoliated into multilayered Ti3C2Tx nanosheets (i.e. Ti3C2Tx MXene). The prepared Ti3C2Tx MXene not only has a large electrochemical surface area for the oxidation of 4-CP and 4-NP, but also lowers their electron transfer resistance. As a result, the oxidation signals of 4-CP and 4-NP are significantly improved on the surface of the Ti3C2Tx MXene. Based on the remarkable signal amplification of the Ti3C2Tx MXene, a sensitive and rapid method was developed for the simultaneous detection of 4-CP and 4-NP. The linear range is from 0.1 to 20.0 μM for 4-CP, and from 0.5 to 25.0 μM for 4-NP, with detection limits of 0.062 μM (4-CP) and 0.11 μM (4-NP). This method was used in wastewater samples, and the accuracy was confirmed to be good by high-performance liquid chromatography.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Dechao Wang,Yangyang Xin,Yudeng Wang,Xiaoqian Li,Hu Wu,Weirui Zhang,Dongdong Yao,Hongni Wang,Yaping Zheng,Zhongjie He,Zhiyuan Yang,Xingfeng Lei
The emerging two-dimensional transition metal carbides (MXenes) have been gradually coming into the limelight due to excellent mechanical properties, electrical conductivity performance and versatile surface chemistry. However, the oxidation instability and poor processability of MXenes impede further scalable applications. Toward this end, we have for the first time proposed a general and facile strategy to transform Ti 3 C 2 T x MXene into a novel class of homogenous, stable solvent-free liquids (MX-fluid) with core-corona-canopy structure via covalent linkage surface engineering strategy. The as-prepared MX-liquid exhibited rather stable antioxidant ability after setting for 540 days. Moreover, the MX-fluid presented macroscopic flow behaviors at room temperature, remarkably improving processability and showing extensive potential in addressing the daunting dispersion issue when blending the Ti 3 C 2 T x with other polymer matrixes. Furthermore, the generality of constructing solvent-free MXene fluids using covalent corona-canopy linkage strategy was verified. As two proof-of-concept demonstrations, the MX-fluid was first utilized as a filler phase of mixed matrix membranes (MMMs). The MX-fluid exhibited greatly enhanced CO 2 uptake compared with that of N 2 , which was also confirmed by molecular simulation. Next, the MX-fluid was incorporated into Pebax-1657 matrix, and improved CO 2 selective separation (CO 2 /N 2 selectivity of 69.2) was obtained, where the CO 2 permeability increased by 179.9% compared with pristine Pebax-1657 membrane. Second, the MX-fluid was demonstrated a good reinforcement phase of epoxy-based composites. Remarkably, the rich library of MXenes family and oligomer species provides more convenience for the further optimization of structures of solvent-free MXene liquids for task-specific applications, thus paving new ways to advance the development of novel solvent-free MXene liquids into scale-up and practical applications
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Nano-Micro Letters
·
2021
·Vol. 13
·期 1
·1-13
·
IF 16.419
Jin Xin,Yang Lin,Wang Xiao-Feng
Two-dimensional (2D) perovskites solar cells (PSCs) have attracted considerable attention owing to their excellent stability against humidity; however, some imperfectness of 2D perovskites, such as poor crystallinity, disordered orientation, and inferior charge transport still limit the power conversion efficiency (PCE) of 2D PSCs. In this work, 2D Ti 3 C 2 T x MXene nanosheets with high electrical conductivity and mobility were employed as a nanosized additive to prepare 2D Ruddlesden–Popper perovskite films. The PCE of solar cells was increased from 13.69 (without additive) to 15.71% after incorporating the Ti 3 C 2 T x nanosheets with an optimized concentration. This improved performance is attributed to the enhanced crystallinity, orientation, and passivated trap states in the 3D phase that result in accelerated charge transfer process in vertical direction. More importantly, the unencapsulated cells exhibited excellent stability under ambient conditions with 55 ± 5% relative humidity.
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Nano Research
·
2020
·Vol. 13
·期 11
·3048-3056
·
IF 8.183
Li Wei,Li Xiaofeng,Chang Wei,Wu Jing,Liu Pengfei,Wang Jianjun,Yao Xi,Yu Zhong-Zhen
Effective utilization of abundant solar energy for desalination of seawater and purification of wastewater is one of sustainable techniques for production of clean water, helping relieve global water resource shortage. Herein, we fabricate a vertically aligned reduced graphene oxide/Ti 3 C 2 T x MXene (A-RGO/MX) hybrid hydrogel with aligned channels as an independent solar steam generation device for highly efficient solar steam generation. The vertically aligned channels, generated by a liquid nitrogen-assisted directional-freezing process, not only rapidly transport water upward to the evaporation surface for efficient solar steam generation, but also facilitate multiple reflections of solar light inside the channels for efficient solar light absorption. The deliberate slight reduction endows the RGO with plenty of polar groups, decreasing the water vaporization enthalpy effectively and hence accelerating water evaporation efficiently. The MXene sheets, infiltrated inside the A-RGO hydrogel on the basis of Marangoni effect, enhance light absorption capacity and photothermal conversion performance. As a result, the A-RGO/MX hybrid hydrogel achieves a water evaporation rate of 2.09 kg·m −2 ·h −1 with a high conversion efficiency of 93.5% under 1-sun irradiation. Additionally, this photothermal conversion hydrogel rapidly desalinates seawater and purifies wastewater to generate clean water with outstanding ion rejection rates of above 99% for most ions.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Tianjiao Zhu,Dong Chen,Yangyang Mao,Yongan Cao,Wenju Wang,Yuqian Li,Hongfu Jiang,Shen Shen,Qunchao Liao
The commercial application of lithium–sulfur (Li–S) batteries has faced obstacles, including challenges related to low sulfur utilization, structural degradation resulting from electrode volume expansion, and migration of polysulfide lithium (LiPSs). Herein, Co1–xS/3D-Ti3C2Tx composites with three-dimensional (3D) multilayered structures are used as separator modification materials for Li–S batteries to solve these problems. The multilevel layered structure of Co1–xS/3D-Ti3C2Tx establishes an efficient electron and Li+ transfer path, alleviates the volume change during the battery charge–discharge process, and enhances the stability of the structure. In addition, the battery assembled with the modified separator shows excellent discharge capacity and cycle stability at 0.5 C and could maintain a high discharge capacity after 500 cycles. This work provides a method for designing highly dispersed metal sulfide nanoparticles on MXenes and extends the application of MXenes-based composites in electrochemical energy storage.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Lili Zhu,Yutong Cao,Bai Jiang,Junrong Yu,Jing Zhu,Zuming Hu
Incorporating compressibility , elasticity, and porous structures into microwave- absorbing materials will facilitate electromagnetic wave absorption (EMA) and improve environmental adaptability for practical applications. Herein, a strategy to prepare Ti 3 C 2 T x MXene/reduced graphene oxide (RGO)/ cellulose nanocrystals (CNCs) aerogels via a directed freezing method to design three-dimensional structures and strengthen the interaction between Ti 3 C 2 T x MXene and RGO lamellae is demonstrated. Oriented structures and the addition of CNCs benefit structural stability while achieving superior absorption performance by forming perfect impedance matching and multiple polarization effects. Interestingly, the prepared MXene/RGO/CNCs (MRC-20) aerogel delivers the prominent EMA performance in reported MXene-based absorbing materials, with a minimal reflection loss (RL min ) of − 72.32 dB at 12.0 GHz corresponding to a matching thickness of 2.56 mm and an effective absorption bandwidth (EAB) of 4.96 GHz at 1.88 mm with an RL min of − 59.87 GHz. Furthermore, by tuning the content of CNCs, the MRC-20 aerogel exhibits the highest stress (37.2 kPa) at 70% compressive strain and demonstrates the stability of the compression cycle. These intriguing features make the hybrid aerogel stand out among numerous absorbers.
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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 MEMBRANE SCIENCE
·
2023
·
IF 9.5
Haiyu Luo,Nan Xu,Yanan Li,Junzhi Li,Wenlan Ji,Pei Nian,Zheng Wang,Yibin Wei
MXene nanosheets have been identified as promising building blocks for high-performance nanofiltration (NF) membranes in water purification . Herein, we report a series of amino acid-bonded Ti 3 C 2 T x MXene membranes with enhanced NF performance and antifouling properties via glycine (Gly), l -glutamic acid (L-Glu), l -lysine (L-Lys) or l -cysteine (L-Cys) modification. The physicochemical properties, separation performances and anti-fouling behaviors of the pure Ti 3 C 2 T x MXene membrane, Gly-, L-Glu-, L-Lys- and L-Cys-bonded Ti 3 C 2 T x MXene membranes were comparatively investigated. The stable Ti–N bonds were found between the amino acids and the MXene nanosheets and different amino acids lead to different properties of the corresponding membranes. While maintaining ultra-high rejections to various organic dyes, all the amino acid functionalized membranes exhibited enhanced water permeability (7.17–13.11 L·m −2 ·h −1 ·bar −1 ) compared with that of the pure MXene membrane. Importantly, the Gly-bonded membrane showed the optimal separation performance with high salt rejections of 86.28%, 81.36%, 72.88% and 66.82% to MgSO 4 , MgCl 2 , Na 2 SO 4 and NaCl, respectively, and the membrane also exhibited superior anti-fouling property with a flux recovery rate of 80.59% to bovine serum albumin (BSA). The separation mechanism was further revealed which may offer a simple yet efficient way for enhancing 2D MXene-based NF membranes.
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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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ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Jiuao Wang,Zhen He,Zongliang Du,Xu Cheng,Haibo Wang,Xiaosheng Du
Phase change materials (PCMs) with superior solar-thermal harvest and efficient infrared stealth have crucial significance for modern military wearable thermal management but suffer from liquid leakage, poor motion detection, and intrinsic solid rigidity of conventional solid–liquid PCMs. In this work, highly stretchable phase change films (MPSPCFs) with sensitive motion detection, superior solar-thermal harvest, and efficient infrared stealth were designed using Ti3C2Tx MXene nanosheets, silicone rubber elastomers, n-eicosane, and poly(vinyl alcohol). The MPSPCF exhibited excellent energy storage density (107.1 J/g), long-term thermal reversibility (100 cycles), and superior flexibility. The lamination of MPSPCF with natural cotton fabrics enabled effective infrared stealth for thermal targets. Furthermore, due to the introduction of the MXene/PVA layer, the MPSPCF processed excellent solar-thermal conversion efficiency (η = 86.7%) and sensitive strain sensing (GF = 4.45). The MPSPCF-based thermoelectric power generation system was designed, which generated a maximum power of 91.95 mW. The MPSPCF could also be utilized as a strain sensor to detect human movement, including the bending motion of the finger, wrist, elbow, and knee. Combining these multiple functions, the MPSPCF developed in this work has great potential for personal thermal management applications in both military and civil fields, offering new ideas for the design of advanced PCM composites.
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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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