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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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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ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Kaiming Zhang,Jiawen Sun,Jingyao Song,Chuanhui Gao,Zhe Wang,Chengxin Song,Yumin Wu,Yuetao Liu
Flexible conductive composites can be used as wearable strain sensors, which are widely used in the fields of new-generation robotics, electronic skin, and human detection. However, how to make conductive composites that simultaneously possess flexibility, stretchability, self-healing, and sensing capability is challenging research. In this work, we innovatively designed and prepared a silicone polymer conductive composite. MXenes and amino poly(dimethylsiloxane) were modified by small biomolecules via an esterification reaction and a Schiff base reaction, respectively. The modified MXenes are uniformly dispersed, which endows the composite with good electrical conductivity. The reversibility of multiple hydrogen bonds and imine bonds in the composite system makes it have ideal tensile properties and high-efficiency self-healing ability without external stimulation. The conductive composite containing 10 wt % A-MXenes showed an elongation of 81%, and its mechanical strength could reach 1.81 MPa. After repair, the tensile properties and the electrical conductivity could be restored to 98.4 and 97.6%, respectively. In addition, the conductive composite is further evaluated for the value of wearable strain sensors. Even after cut-healed processes, the conductive composite can still accurately detect tiny human movements (including speaking, swallowing, and pressing). This kind of self-healing MXene/PDMS elastomers based on the modification of small biomolecules has great potential as wearable strain sensors. This simple preparation method provides guidance for future multifunctional flexible electronic materials.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Huihui Huang,Yuqing Sun,Lele Cui,Yingxiang Ni,Shilong Li,Weihong Xing,Wenheng Jing
Ceramic membranes for emulsification are generally fabricated by particle stacking. As a result, their small adjacent pore distances and hydrophilicity cause water droplets to coalesce when preparing monodisperse submicron water-in-diesel (W/D) emulsions. Here, we present a two dimensional-modified membrane emulsification model for the first time, with the development of a hydrophobic MXene-modified ceramic membrane with a water contact angle of 144.7 ± 1.2°. Benefiting from their large lateral size, MXene nanomaterials not only increase the distance between channels but also provide longitudinal-lateral transport pathways for dispersed phases. Therefore, the dispersed phase droplets can roll along the interlayer nanochannels of the MXene-modified membrane before converging with the continuous phase, thereby preventing the coalescence of emulsions. The MXene-modified membrane presents an excellent emulsification ability for preparing W/D emulsions, and the resulting diesel emulsions are at a submicron level with a unimodal distribution, an average particle size of 400 nm, and a particle size distribution coefficient of 0.7. This novel MXene-modified membrane for emulsification is of great significance since it provides a simple and promising strategy for the development of monodisperse nano or submicron emulsions.
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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 56
·期 6
·4212-4224
·
IF 3.553
Sheng Xinxin,Li Sihao,Huang Haowei,Zhao Yanfeng,Chen Ying,Zhang Li,Xie Delong
Abstract In this work, Ti 3 C 2 MXene, a novel two-dimensional nanosheet, was introduced to waterborne polyurethane (WPU) coatings to prepare a composite coating. First, MAX phase materials were in situ etched by HF acid and further intercalated by water molecules to obtain exfoliated single-layer MXene nanosheet. And then, composite coatings were prepared via solution-blending low addition (0–0.4 wt%) of MXene, self-prepared waterborne polyacrylate emulsion (PAE) and isocyanate hardener, applying on Q235 mild steel. Results of AFM, XRD SEM and SEM–EDS confirm that single-layer MXene nanosheets with large lateral-to-thickness ratio are successfully prepared and achieved homogenous distribution within WPU matrix. With 0.4 wt% MXene incorporated, the WPU/Ti 3 C 2 MXene composite coatings reach a lowest corrosion current of 2.143 × 10 –6 A/cm 2 , a decrease of one order of magnitude compared with blank WPU (1.599 × 10 –5 A/cm 2 ) and own an excellent UV-blocking property (almost block the whole UV light). Graphical abstract
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2020
·
IF 6.444
Kunpeng Qian,Qianfan Zhou,Hongmin Wu,Jianhui Fang,Miao Miao,Yuhuan Yang,Shaomei Cao,Liyi Shi,Xin Feng
Well established internal multilayered structures have been demonstrated to contribute greatly towards outstanding shielding effectiveness (SE) in electromagnetic interference (EMI) shielding systems. A specific encapsulation by intercalating carbonized cellulose microspheres into Ti 3 C 2 T x MXene layers (CCM@MXene) is elaborately designed. The CCM@void@MXene composite films with “egg-box” structure are ultimately achieved by annealing treatment with spherical CCM@MXene as “egg” and Ti 3 C 2 T x MXene layers as “box”. The unique structure with interior void space is attributed to internal multiple reflections of incident electromagnetic waves (EMW) and contributes to the enhancement of EMW absorption. Thanks to the electrically conductive network of Ti 3 C 2 T x MXene adhering to cellulose microspheres surface, the egg-box structure composite films exhibit superb electrical conductivity of 1672.0 ± 7.1 S cm −1 and excellent specific EMI shielding efficiency (up to 18637.14 dB cm 2 g −1 ) at an ultrathin thickness (12.1 ± 0.8 μm). This hierarchical porous egg-box structure offers an ideal potential for application in highly efficient EMI shielding systems.
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Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 32
·16265-16270
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IF 11.301
Wenjuan Han,Ming Lu,Junnan Chen,Haojie Li,Haibo Li,Bingsen Zhang,Wei Zhang,Weitao Zheng
EMIm+, as a substitute for Li+, can solve the initial problems that accompany lithiation/delithiation processes on an anode. However, the larger size of EMIm+ limits the options when it comes to electrode materials. Herein, a multilayered Ti3C2Tx MXene was electrochemically pre-intercalated with Fe ions to achieve EMIm+ hosting abilities. As a result, a pre-intercalated MXene electrode exhibited enhanced EMIm+ transport and storage capabilities. When integrated with an EMIm+[PF6]− ionic liquid electrolyte, the assembled DIB provides an energy density of 76 W h kg−1 at a power density of 360 W kg−1, and 94.3% of the energy density is retained after 50 cycles. Compared with a pristine example, the Fe pre-intercalated Ti3C2Tx MXene showed a significant increase in electrochemical performance. Employing this approach to optimize layered materials may open up a new route for accurately tuning intercalated materials.
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Journal of Environmental Chemical Engineering
·
2020
·
IF 4.3
Xuefeng Sha,Huizhen Huang,Shiyan Sun,Hongye Huang,Qiang Huang,Ziyang He,Meiying Liu,Naigen Zhou,Xiaoyong Zhang,Yen Wei
MXene has emerged as one of the most interesting two-dimensional (2D) nanomaterials , that has been widely explored for various applications, including environmental adsorption. However, the adsorption performance of unmodified MXene is poor and surface functionalization is necessary to endow new properties and improve the adsorption performance. In this work, we reported the fabrication of MXene based bismuth oxide (MXene-PDA-Bi 6 O 7 ) composites for the first time through the mussel-inspired chemistry, which relied on the self-polymerization of dopamine to form polydopamine (PDA) films on MXene for subsequent immobilization of Bi 6 O 7 nanoparticles . The utilization of MXene-PDA-Bi 6 O 7 composites for adsorptive removal of iodide ions and the adsorption parameters on adsorption behavior were examined in details. The surface morphology, chemical structure and chemical compositions of these samples were characterized by a series of techniques. The results demonstrated that the maximum adsorption capacity of MXene-PDA-Bi 6 O 7 towards iodide ions is 64.65 mg/g, which is obviously greater than that of unmodified MXene and MXene-PDA under identical adsorption conditions. In the fabrication strategy, the PDA could be facilely coated on the MXene and provide a platform for further immobilization of the Bi 6 O 7 nanoparticles. This method is simple, easy of operation and can be occurred under benign and mild experimental conditions. Moreover, this method could also be utilized for introduction of other functional components on the MXene and thus multifunctional MXene based composites with designed properties and functions could be fabricated. We believe that this work will open a new avenue for fabrication of functional MXene based composites for environmental treatment.
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CARBON
·
2020
·
IF 8.821
Ruixin Zheng,Chaozhu Shu,Zhiqian Hou,Anjun Hu,Jianxiao Zhao,Yaowen Guo,Miao He,Yu Yan,Jianping Long
Vacancy induced electronic structure design is considered as one of the most promising strategies to develop remarkable electrocatalysts for lithium-oxygen battery (LOB) due to its ability to tuning electronic properties and enhancing electronic migration rate. Herein, regulation of electronic structure is realized by introducing oxygen vacancy into SnO 2 on Ti 3 C 2 Tx MXene (Vo-SnO 2 /Ti 3 C 2 Tx), which acts as physical scaffold to form a stable interface. The fully exposed active sites combining the heterogeneous interface is favorable for optimizing the adsorption capability of Vo-SnO 2 /Ti 3 C 2 Tx for intermediate species and promoting interfacial charge transfer, which will accelerate the kinetics of both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). The high round-trip efficiency (84%), large specific capacity (18648 mA h g −1 ) and extended cyclability with low overpotential (200 cycles) of the Vo-SnO 2 /Ti 3 C 2 Tx based LOBs experimentally confirm its superior electrocatalytic activity . This study provides a general approach for developing superior electrocatalysts via electronic structure modulation for high performance LOBs.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Yijiao Xue,Jiabing Feng,Siqi Huo,Pingan Song,Bin Yu,Lei Liu,Hao Wang
The creation of thermostable, flame-retardant, mechanically robust bioplastics is highly desirable in the industry as one sustainable alternative to traditional petroleum-based plastics. Unfortunately, to date there lacks an effective strategy to endow commercial bioplastics, such as polylactide (PLA) with such desired integrated performances. Herein, we have demonstrated the fabrication of a novel MXene-phenyl phosphonic diaminohexane (MXene-PPDA) nanohybrid via the intercalation of PPDA into the MXene interlayer. The interlayer spacing of MXene nanosheets is enlarged and as-prepared MXene-PPDA is homogeneously dispersed in the PLA matrix. Incorporating 1.0 wt% MXene-PPDA enables PLA to achieve a UL-94 V-0 rating, with a ~22.2% reduction in peak heat release rate, indicating a significantly improved flame retardancy. Meanwhile, the 1.0 wt% MXene-PPDA also increases the initial decomposition temperature of PLA composite, giving rise to a ~25-fold enhancement in char yield relative to pure PLA. Additionally, the MXene-PPDA enhances the toughness while retains the mechanical strength for PLA. This work offers an innovative strategy for the design of multifunctional additives and the creation of high-performance polymers with high thermal stability, mechanical robustness and low flammability, expecting to find many practical applications in the industry.
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Nano-Micro Letters
·
2020
·Vol. 12
·期 1
·1-16
·
IF 12.264
Deng Baiwen,Xiang Zhen,Xiong Juan,Liu Zhicheng,Yu Lunzhou,Lu Wei
Sandwich-like laminated Fe&TiO 2 @C nanocomposites were successfully prepared from the MXene–MOFs hybrids.
A broad effective bandwidth of 6.5 GHz at a thickness of only 1.6 mm was achieved.
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PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
·
2020
·Vol. 217
·期 8
·1900806
·
IF 1.759
Jingbo Li,Yu Liu,Fang Xu,Junping Hu,Nan Chen,Guoping Du,Changshuang Jiang
As a 2D material, Ti 3 C 2 (MXene) has been recently used as electrodes for electrochemical capacitors. Herein, a two-step procedure is used to obtain a highly opened layer structure for Ti 3 C 2 , which differs from the methods used in the literature for synthesizing exfoliated MXene. First, the mild NH 4 HF 2 etching agent is used to prepare the regular Ti 3 C 2 MXene. Second, KOH is added into the obtained solution for K + to intercalate the MXene. The K + intercalation is found to greatly increase the (002) crystal planar spacing of the Ti 3 C 2 from 10.8 to 12.4 Å. More importantly, this K + -intercalated MXene exhibits a highly opened layer structure, whereas the regular MXene only has a partially opened layer structure. Consequently, the former is expected to allow much more active sites exposed to liquid electrolyte, and also facilitates remarkably higher ion and electron transport efficiency. To investigate their electrochemical capacitance properties, the regular and K + -intercalated Ti 3 C 2 MXenes are used to fabricate binder-free electrodes on nickel foams by an electrophoretic deposition method. The K + -intercalated MXene-based electrode is found to have twice higher specific capacitance than the regular MXene. Furthermore, the K + -intercalated Ti 3 C 2 MXene-based electrode exhibits an excellent cyclic stability.
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